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Mud logging & Wireline logging from North Dibeilla. Agadem block.
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Mud logging amp Wireline logging from North DibeillaAgadem block
The mud and wireline logging are part of to the exploration department activities The mud logging unit is one of the important safety instruments in drilling process once it gives accessibility of formation directs parameters on real time It allow the formation evaluation more accurately when it follow with the wireline logging techniques We are going to underline the mud and wireline logging practical work flow on Dibeilla North prospect in the well Dibeilla N-5
Introduction
The Well description
Primary objective in terms of potential resource at the Dibeilla N-5 is the Alternances de Sokor which is interpreted as a series of stacked fluvial channel deposits cut into the floodplain and lacustrine shale
Well Dibeilla N-5 is an appraisal well in the southern portion of Dibeilla North oilfield (fig) to be drilled by the operator in the block for the purpose of 1) To discover new oil reserves in Alternances de Sokor formation for oil export 2) To understand the extending regulation of reservoir sand 3) To get more velocity information
Fig2 the well Dibeilla N-5 location by seismic map
The well profile and the method to use to reach the target depend on many people The target and formation depth expectation are giving by the exploration department since the responsibility of the drilling operation belongs to one specific department The operation requires many steps which are notified in documents
-The well proposal document -The drilling program document
The drilling operations
Necessary data for the drilling operation
The Rig Equipment
Summary of Drilling Operations
1 Placing the drilling bit Place the drill bit collar and drill pipe in the hole 2 Attaching the Kelly Attach the Kelly and turntable and begin drilling 3 Mud circulation As drilling progresses circulate mud through the pipe and out of the bit to float the rock cuttings out of the hole4 Adding drill pipe Add new sections (joints) of drill pipes as the hole gets deeper5 Trip out Remove (trip out) the drill pipe collar and bit when the pre-set depth (any where from a few hundred to a couple-thousand feet) is reached
Fig4 the oil well architecture
6 First surface casing pipe placed in the well to prevent the wall of the hole from caving in to prevent movement of fluids from one formation to another and to aid in well control
7 Installing the wellhead this conclude the end of all the drilling operations
NB The mud logging took all his sense by the circulation of the mud when the drilling progress
Fig5 the mud circulation system
Function of Drilling Mud
1 Remove drilled cuttings from the borehole ( viscosity)2 Carry and release the cutting at the surface3 Control subsurface pressures4 Prevent the borehole from collapsing5 Protect producing formation from damage
Clean cool and lubricate the drill stringSeal porous and permeable zones with an impermeable filter cakeHelp support part of the weight of the drill stringEnsure maximum information from the formation drilled
The primary purposes of the drilling fluids were to clean cool and lubricate the bit and continuously remove cuttings from the borehole But now this fluid has become a complicated mixture of liquids solids and chemicals and has given birth to a new discipline mud engineering The functions and corresponding properties of a drilling mud are
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The mud and wireline logging are part of to the exploration department activities The mud logging unit is one of the important safety instruments in drilling process once it gives accessibility of formation directs parameters on real time It allow the formation evaluation more accurately when it follow with the wireline logging techniques We are going to underline the mud and wireline logging practical work flow on Dibeilla North prospect in the well Dibeilla N-5
Introduction
The Well description
Primary objective in terms of potential resource at the Dibeilla N-5 is the Alternances de Sokor which is interpreted as a series of stacked fluvial channel deposits cut into the floodplain and lacustrine shale
Well Dibeilla N-5 is an appraisal well in the southern portion of Dibeilla North oilfield (fig) to be drilled by the operator in the block for the purpose of 1) To discover new oil reserves in Alternances de Sokor formation for oil export 2) To understand the extending regulation of reservoir sand 3) To get more velocity information
Fig2 the well Dibeilla N-5 location by seismic map
The well profile and the method to use to reach the target depend on many people The target and formation depth expectation are giving by the exploration department since the responsibility of the drilling operation belongs to one specific department The operation requires many steps which are notified in documents
-The well proposal document -The drilling program document
The drilling operations
Necessary data for the drilling operation
The Rig Equipment
Summary of Drilling Operations
1 Placing the drilling bit Place the drill bit collar and drill pipe in the hole 2 Attaching the Kelly Attach the Kelly and turntable and begin drilling 3 Mud circulation As drilling progresses circulate mud through the pipe and out of the bit to float the rock cuttings out of the hole4 Adding drill pipe Add new sections (joints) of drill pipes as the hole gets deeper5 Trip out Remove (trip out) the drill pipe collar and bit when the pre-set depth (any where from a few hundred to a couple-thousand feet) is reached
Fig4 the oil well architecture
6 First surface casing pipe placed in the well to prevent the wall of the hole from caving in to prevent movement of fluids from one formation to another and to aid in well control
7 Installing the wellhead this conclude the end of all the drilling operations
NB The mud logging took all his sense by the circulation of the mud when the drilling progress
Fig5 the mud circulation system
Function of Drilling Mud
1 Remove drilled cuttings from the borehole ( viscosity)2 Carry and release the cutting at the surface3 Control subsurface pressures4 Prevent the borehole from collapsing5 Protect producing formation from damage
Clean cool and lubricate the drill stringSeal porous and permeable zones with an impermeable filter cakeHelp support part of the weight of the drill stringEnsure maximum information from the formation drilled
The primary purposes of the drilling fluids were to clean cool and lubricate the bit and continuously remove cuttings from the borehole But now this fluid has become a complicated mixture of liquids solids and chemicals and has given birth to a new discipline mud engineering The functions and corresponding properties of a drilling mud are
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The Well description
Primary objective in terms of potential resource at the Dibeilla N-5 is the Alternances de Sokor which is interpreted as a series of stacked fluvial channel deposits cut into the floodplain and lacustrine shale
Well Dibeilla N-5 is an appraisal well in the southern portion of Dibeilla North oilfield (fig) to be drilled by the operator in the block for the purpose of 1) To discover new oil reserves in Alternances de Sokor formation for oil export 2) To understand the extending regulation of reservoir sand 3) To get more velocity information
Fig2 the well Dibeilla N-5 location by seismic map
The well profile and the method to use to reach the target depend on many people The target and formation depth expectation are giving by the exploration department since the responsibility of the drilling operation belongs to one specific department The operation requires many steps which are notified in documents
-The well proposal document -The drilling program document
The drilling operations
Necessary data for the drilling operation
The Rig Equipment
Summary of Drilling Operations
1 Placing the drilling bit Place the drill bit collar and drill pipe in the hole 2 Attaching the Kelly Attach the Kelly and turntable and begin drilling 3 Mud circulation As drilling progresses circulate mud through the pipe and out of the bit to float the rock cuttings out of the hole4 Adding drill pipe Add new sections (joints) of drill pipes as the hole gets deeper5 Trip out Remove (trip out) the drill pipe collar and bit when the pre-set depth (any where from a few hundred to a couple-thousand feet) is reached
Fig4 the oil well architecture
6 First surface casing pipe placed in the well to prevent the wall of the hole from caving in to prevent movement of fluids from one formation to another and to aid in well control
7 Installing the wellhead this conclude the end of all the drilling operations
NB The mud logging took all his sense by the circulation of the mud when the drilling progress
Fig5 the mud circulation system
Function of Drilling Mud
1 Remove drilled cuttings from the borehole ( viscosity)2 Carry and release the cutting at the surface3 Control subsurface pressures4 Prevent the borehole from collapsing5 Protect producing formation from damage
Clean cool and lubricate the drill stringSeal porous and permeable zones with an impermeable filter cakeHelp support part of the weight of the drill stringEnsure maximum information from the formation drilled
The primary purposes of the drilling fluids were to clean cool and lubricate the bit and continuously remove cuttings from the borehole But now this fluid has become a complicated mixture of liquids solids and chemicals and has given birth to a new discipline mud engineering The functions and corresponding properties of a drilling mud are
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The well profile and the method to use to reach the target depend on many people The target and formation depth expectation are giving by the exploration department since the responsibility of the drilling operation belongs to one specific department The operation requires many steps which are notified in documents
-The well proposal document -The drilling program document
The drilling operations
Necessary data for the drilling operation
The Rig Equipment
Summary of Drilling Operations
1 Placing the drilling bit Place the drill bit collar and drill pipe in the hole 2 Attaching the Kelly Attach the Kelly and turntable and begin drilling 3 Mud circulation As drilling progresses circulate mud through the pipe and out of the bit to float the rock cuttings out of the hole4 Adding drill pipe Add new sections (joints) of drill pipes as the hole gets deeper5 Trip out Remove (trip out) the drill pipe collar and bit when the pre-set depth (any where from a few hundred to a couple-thousand feet) is reached
Fig4 the oil well architecture
6 First surface casing pipe placed in the well to prevent the wall of the hole from caving in to prevent movement of fluids from one formation to another and to aid in well control
7 Installing the wellhead this conclude the end of all the drilling operations
NB The mud logging took all his sense by the circulation of the mud when the drilling progress
Fig5 the mud circulation system
Function of Drilling Mud
1 Remove drilled cuttings from the borehole ( viscosity)2 Carry and release the cutting at the surface3 Control subsurface pressures4 Prevent the borehole from collapsing5 Protect producing formation from damage
Clean cool and lubricate the drill stringSeal porous and permeable zones with an impermeable filter cakeHelp support part of the weight of the drill stringEnsure maximum information from the formation drilled
The primary purposes of the drilling fluids were to clean cool and lubricate the bit and continuously remove cuttings from the borehole But now this fluid has become a complicated mixture of liquids solids and chemicals and has given birth to a new discipline mud engineering The functions and corresponding properties of a drilling mud are
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The Rig Equipment
Summary of Drilling Operations
1 Placing the drilling bit Place the drill bit collar and drill pipe in the hole 2 Attaching the Kelly Attach the Kelly and turntable and begin drilling 3 Mud circulation As drilling progresses circulate mud through the pipe and out of the bit to float the rock cuttings out of the hole4 Adding drill pipe Add new sections (joints) of drill pipes as the hole gets deeper5 Trip out Remove (trip out) the drill pipe collar and bit when the pre-set depth (any where from a few hundred to a couple-thousand feet) is reached
Fig4 the oil well architecture
6 First surface casing pipe placed in the well to prevent the wall of the hole from caving in to prevent movement of fluids from one formation to another and to aid in well control
7 Installing the wellhead this conclude the end of all the drilling operations
NB The mud logging took all his sense by the circulation of the mud when the drilling progress
Fig5 the mud circulation system
Function of Drilling Mud
1 Remove drilled cuttings from the borehole ( viscosity)2 Carry and release the cutting at the surface3 Control subsurface pressures4 Prevent the borehole from collapsing5 Protect producing formation from damage
Clean cool and lubricate the drill stringSeal porous and permeable zones with an impermeable filter cakeHelp support part of the weight of the drill stringEnsure maximum information from the formation drilled
The primary purposes of the drilling fluids were to clean cool and lubricate the bit and continuously remove cuttings from the borehole But now this fluid has become a complicated mixture of liquids solids and chemicals and has given birth to a new discipline mud engineering The functions and corresponding properties of a drilling mud are
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Summary of Drilling Operations
1 Placing the drilling bit Place the drill bit collar and drill pipe in the hole 2 Attaching the Kelly Attach the Kelly and turntable and begin drilling 3 Mud circulation As drilling progresses circulate mud through the pipe and out of the bit to float the rock cuttings out of the hole4 Adding drill pipe Add new sections (joints) of drill pipes as the hole gets deeper5 Trip out Remove (trip out) the drill pipe collar and bit when the pre-set depth (any where from a few hundred to a couple-thousand feet) is reached
Fig4 the oil well architecture
6 First surface casing pipe placed in the well to prevent the wall of the hole from caving in to prevent movement of fluids from one formation to another and to aid in well control
7 Installing the wellhead this conclude the end of all the drilling operations
NB The mud logging took all his sense by the circulation of the mud when the drilling progress
Fig5 the mud circulation system
Function of Drilling Mud
1 Remove drilled cuttings from the borehole ( viscosity)2 Carry and release the cutting at the surface3 Control subsurface pressures4 Prevent the borehole from collapsing5 Protect producing formation from damage
Clean cool and lubricate the drill stringSeal porous and permeable zones with an impermeable filter cakeHelp support part of the weight of the drill stringEnsure maximum information from the formation drilled
The primary purposes of the drilling fluids were to clean cool and lubricate the bit and continuously remove cuttings from the borehole But now this fluid has become a complicated mixture of liquids solids and chemicals and has given birth to a new discipline mud engineering The functions and corresponding properties of a drilling mud are
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
6 First surface casing pipe placed in the well to prevent the wall of the hole from caving in to prevent movement of fluids from one formation to another and to aid in well control
7 Installing the wellhead this conclude the end of all the drilling operations
NB The mud logging took all his sense by the circulation of the mud when the drilling progress
Fig5 the mud circulation system
Function of Drilling Mud
1 Remove drilled cuttings from the borehole ( viscosity)2 Carry and release the cutting at the surface3 Control subsurface pressures4 Prevent the borehole from collapsing5 Protect producing formation from damage
Clean cool and lubricate the drill stringSeal porous and permeable zones with an impermeable filter cakeHelp support part of the weight of the drill stringEnsure maximum information from the formation drilled
The primary purposes of the drilling fluids were to clean cool and lubricate the bit and continuously remove cuttings from the borehole But now this fluid has become a complicated mixture of liquids solids and chemicals and has given birth to a new discipline mud engineering The functions and corresponding properties of a drilling mud are
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Function of Drilling Mud
1 Remove drilled cuttings from the borehole ( viscosity)2 Carry and release the cutting at the surface3 Control subsurface pressures4 Prevent the borehole from collapsing5 Protect producing formation from damage
Clean cool and lubricate the drill stringSeal porous and permeable zones with an impermeable filter cakeHelp support part of the weight of the drill stringEnsure maximum information from the formation drilled
The primary purposes of the drilling fluids were to clean cool and lubricate the bit and continuously remove cuttings from the borehole But now this fluid has become a complicated mixture of liquids solids and chemicals and has given birth to a new discipline mud engineering The functions and corresponding properties of a drilling mud are
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The Mud loggingMud logging is one of the important activities in drilling operation it provides for continuous on-site inspection detection and evaluation of the rock units as they are being drilled with regards to correlation and potential hydrocarbon production Obtaining the Mud logging data and their real evaluation are very important factors for the exploration programs
Factors that affect the amount of hydrocarbons remaining in the formation after flushing and which in turn affect the amount of oil and gas entrained in the drilling fluid are1048698 Depth1048698 Rate of Penetration1048698 Size of the borehole1048698 Volume of drilling fluid circulated1048698 Physical properties of the formation1048698 Properties of the drilling fluid
Using Mudlogging to its greatest advantage depends on several factors One is the clients knowledge of the subsurface Another is the consideration given to downhole mechanical factors Others include the reliability of correlation with other wells and the oil companys philosophy towards the well in question
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The Mudlogging Teambull Mudlogging Geologist (Mud logger)bull Pressure Engineer Data Engineerbull Sample Catcher
MUDLOGGING GEOLOGIST Cutting amp core description hydrocarbon show porosity
PRESSURE ENGINEER amp DATA record monitor amp analyze the drilling parameters such as ROP RPM WOB and TORQUE
SAMPLE CATCHER Collect and Prepare Sample for Mudlogging Geologist
Fig6the mud logging team
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Fundamentals Mud logging Equipment
1 Microscope A binocular microscope with several magnifications is used for lithological evaluation and description
2 Ultraviolet light box The UV box is used for determining the percentage physical character color and intensity of hydrocarbon fluorescence within the sample
3 Pit level Indicators Pit level data is continuously recorded in a chart using the maximum allowable chart sapn to ensure maximum sensitivity so that any changes in pit levels are immediately recognized
4 Pump Stroke Sensors Pump stroke counters are used to monitor all active mud pumps for correct lagging of samples to surface
5 Sensors for monitoring mud properties The mud temperature sensor is used to monitor the temperature of the mud going into the hole and coming out of it
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The mud amp drilling parameters
The drilling and mud parameters are giving by means of sensors which are divided into two groups digitals and analogs measured and calculated parameters all are displaying on computer screen within the mud logging unit see (fig) and (fig)
Fig7 the data Engineer Fig8 on real time data show
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
As the mud system directs the drilling process there are two groups of sensors which give the values of mud and drilling parameters the digitals sensors and analogs sensors Digitals Sensors Analogs Sensors
1Depth 1 Hook Load
2 Stand Pipe Pressure2 ROP 3 Casing Pressure
3 Draw-Works 4 Torque
5 Ultra Sonic4 Block Position6 Mud Flow out
7 Mud Temperature
5 Pump Stroke 8 Conductivity
9 Mud Density6 Rotation per Minute 10 Gas Trap
11 Total Gas Sys12 Chromatograph sys
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Gas SystemGas system is a series of devices connected to each other to allow the separation and the determination of the percentage of gases contained on the returning drilling fluid
Fig9 Gas system map
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
One of the most important parameters for lithological analysis and the drilling progress behavior is the Rate of Penetration (ROP)it is An important tool for geological analysis and correlation The ROP is not only dependent to the lithology It is also affected by-Weight on bit-Rotary RPM-Mud properties
Some Specifics mud amp drilling parameters
The lag time The lag time determination is also an important responsibility of the mud logger it is define as a time interval required for pumping the samples from a particular depth to the surface where they can be collected Lag time will allow for correct correlation with real time parameters such as depth and drill rate
The ROP
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The geological controlThe geological control has to be done every a fixed number of meters drilled depending on the drilling program This is done by bringing a sample of cuttings from the shale shakers and cleans By means of the microscope a detailed description of the sample has to done to provide a Masterlog (fig) which contains the geological information and interpretations
Fig10 the Masterlog plot
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The samples shows and cuttings shape color and mineral contains are the majors keys of the lithology description and have both conventional charts (fig) and abbreviations (fig) which allow their differentiation
Fig11 the sample oil shows description reference Fig12 the sample shape description reference
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Beyond naked eyes direct visualization (fig)and microscope analyses (fig) the use of others techniques help to describe theses samples and detect oil or gas shows
Fig13Microscope visualization for the sample description
Fig14 Naked eyes visualization for the sample description
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Miocene-Quaternary
Recent75 ndash 655m
Unconsolidated sands with occasion clayey horizons and interbedded with clays at lower part of the section Fine to coarse sands and gravels Mostly quartz some fields par occasionally varicolored soft clay(See fig )
Fig15 the recent Miocene interpretation from the masterlog
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Well Dibeilla N-5 geological analysis
Age Geological Divisions
Depth Lithology
Oligocene Sokor Shales655 ndash 1027m
Claystones with some fines sand bands (see fig)
Low velocity shale
1027-10m
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
Fig16 the Sokor shale interpretation from the masterlog
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Dibeilla-N-5 mud logging analysis (Geological description and petroleum interest)
The low velocity zone is composed of claystone interbed with sandstone combined with carbonate The Sokor shale and the low velocity zone are the regional cap rock within the block There are some read of significant presence in this zone of methane this dramatically attenuate seismic wave energy The shale interbeding most dominant up to 1000m in the wild Dibeilla area In most of case the drilling engineer changes the drill bit in this Shally zone The Claystones are green color and the shale in olive (fig)
The low velocity zone
Fig17 the Sokor shale samples in low velocity zone Fig18 the Sokor shale interpretation in the low velocity zone from the masterlog
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Sidewall cores
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Sidewall ( swc) what it is
Sidewall are generally made once the well has been drilled They are often done along with the wireline logging Sidewall cores are commonly collected from poorly consolidated zones after the interval has been drilled After fired a gun at the appropriate level A small cylinder of rock is captured and retrieved by a wireline (fig28)
Fig28 the Swc system
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
The advantages of sidewall cores are
The advantages of sidewall cores
1 Lithology and mineralogy of sections are readily obtained2 Shows from cuttings analysis can be confirmed
Since sidewall plugs are small and may also have been crushed somewhat they are not good as good as barrel cores for detemining porosity permeability or fluid saturations However sidewall coring is a quick inexpensive way to sample a selected formation
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Cores analysisThe well site geologist checks core samples whether barell or sidewall for rock type Physical characteristics and mineral composition Fossils help to identify beds The geologist has to take some considerations in especially sidewall core examination like
1 Try to minimize breakage2 One end will be obscured by filter cake3 The sides will consist of material pulverized and compacted by bullet impact
Thanks
Thanks