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8/10/2019 What is an Oilwell
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What is an Oilwell?
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Your idea.
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Where to drill?
?
?
?
??
? ??
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Finding Oil - SEISMIC
Seismic model
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From seismic to drilling
Government
offers blocksto oil company
Oil company studiesthe prospect. Calls
for seismic.
Seismic companyshoots seismic
survey
Oil companycalls for bids to
drill well
Drillingexploration
well
Oil companyevaluates the result
- YES, production
- NO: redo,relinquish, farm out?
Oil company (&government) own theraw seismic data
Seismic companyprocess seismic data
Oil company studiesthe final seismic datafor drilling decision
Oil company (&government) ownthe final seismicdata
The whole cycle can take 3-10 years..
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BUILDING an OILWELL
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Drilling Rig
http://updates.spe.org/wp-content/uploads/2007/07/nomad-rig-kca-web.jpg8/10/2019 What is an Oilwell
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hydrocarbon
Conductor casingpiled inConductor casing36in, 30in, 24 in,..Preventing cave-in
How an Oilwell Looks Like
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hydrocarbon
Drilling fluid (MUD)
1) Cleaning upcuttings
2) Lubricating drill bit
3) Well control
Formation does exert pressure!
What can happen when it is not
controlled?
Hydrostatic pressure, formula:
Mud system
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hydrocarbon
Cementing (WellServices)
Surface casing20in, 13 3/8in, Protecting fresh water
zone
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hydrocarbon
Intermediate casing9 5/8 in, 7in, Sealing off trouble zones
Drilling &
Measurement
http://www.slb.com/content/services/drilling/imaging/provision.asp?8/10/2019 What is an Oilwell
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hydrocarbon
Production casing7in, 41/2in Production!
WirelineBasic measurements:
- Gamma ray
- Caliper
- Neutron
- Resistivity
- Sonic
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hydrocarbon
Will it flow? For how
long? What is the
pressure?
What hydrocarbon?
What quality?
Is it economical?
TESTING
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hydrocarbon
Completion
Completing the
well to produce Monitor &
control the wellproductionduring its life
http://www.slb.com/content/services/completion/reslink/lineslot.asp?8/10/2019 What is an Oilwell
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Artificial Lift
Reservoir pressures do not sustainacceptable flow rates orincapable of
producing fluid flow at all.
When water cut increases and/or the
Reservoir Pressure declines over time.
Artificial Lift Application
Beam Pump
PCP
Jet (Hydraulic)
Gas Lift
ESP System
Flow Rate BBl /day
0 500 1,000 10,000
Good to Excellent Fair to Good Poor, not Recommended
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What can happen during production?
SCALE
Oil
water productionCasing
corrosion
Sand
production
Cement bond
deterioration
Remember that driling phase vs production
phase is 1-3 months vs 20-50 years!
Reservoir
depletion..
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STIMULATION (WS) Cleaning up scales with
chemicals (eg. acids)
Controlling sand production
Bypassing damage withFRACTURING
COILED TUBING (WS)
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Cased hole services (WL)
Analysis behind casing
Production logging
CBL / USIT / Isolation scanner
http://www.slb.com/content/services/evaluation/scanner/index.asp?8/10/2019 What is an Oilwell
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From the birth through the lifetime of the well..
SIS: various softwares to optimize well performance From geology to geophysics, petrophysics, borehole geology, mapping,
modeling and visualization, drilling, economic planning,
DCS: expert interpretation and engineering services
throughout the E&P cycle, from exploration to asset divestiture
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In the field, what you imagine vs what you might see:
Road to work
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In the field, what you imagine vs what you might see:
The Rig
Not shown in picture:
temperature 49 C
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In the field, what you imagine vs what you might see:
The Activities