Offshore Technology ConferenceMay 2, 2005
Riserless Drilling - Applications of an Innovative Drilling Method and Tools
Greg CarterNautilus Offshore Company, Inc.
Bill BlandWeatherford International, Ltd.
Mitchell PinckardVeriDAQ, LLC
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OVERVIEWOVERVIEW
I.I. Riserless / Dual Gradient MethodsRiserless / Dual Gradient Methods
II.II. EdREdR MPD Method MPD Method
III.III.Primary EnablersPrimary Enablers
IV.IV. ConclusionsConclusions
3
Dual Gradient Deepwater Drilling
Pressure (psi)Pressure (psi)
TVD
(ft
)TV
D
(ft)
Water DepthMudline
8.6 ppgDensityEquivalent
16 ppgMud
30003000 60006000000
50005000
1000010000
1500015000
000
90009000
Pore Pressure
8.6 ppg Equivalent
Fracture Gradient
Mud Weight
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Maurer – Glass Bead LiftSMDC – Mud Lift System
Texaco - DeepVision
Shell - SSPS
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30” Csg(700 ft)
20” Csg(2,000 ft)
16” Csg(6,000 ft)
13-3/8” Csg(12,000 ft)
9-5/8”Csg(20,000 ft)
7” Csg(22,000 ft)
EdR-MPDE-Ductor Return ManagedPressure Drilling System
Pump & DumpModified EdR
or Other Method
Casing StringTargetsUsing
EdR-MPD
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Drillpipe
MODU
Eductor Return Line
Active Control Station
Rotating Control Device
Primary EnablersPrimary Enablers
Active Control StationActive Control Station
Eductor Return LineEductor Return Line
InIn--line Multiline Multi--Phase Pump Phase Pump
SubseaSubsea Rotating Control Rotating Control DeviceDevice
Inline Multi-Phase
Pump
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ManagedManagedPressurePressureDrillingDrilling
Drilling technique preciselyDrilling technique preciselycontrols the annular fluidcontrols the annular fluidpressure profile within a pressure profile within a wellborewellbore..
ROTATING HEADROTATING HEAD
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Rotating Control DeviceRotating Control Device
TO SUB SEASURFACE
APPLICATION
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SubSeaSubSea Production Production flowlinesflowlines
& & jumpers jumpers
Return Line TechnologyReturn Line TechnologyDeployment UnitsDeployment Units
Return LinesReturn Lines
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Process Control PrinciplesProcess Control Principles
ShewhartShewhart Control Charts Control Charts for variables.for variables.
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PROBABILITYPROBABILITYOF A POINTOF A POINTOUTSIDEOUTSIDE
ADJUSTMENTSADJUSTMENTSMADEMADE
NORMALNORMALDISTRIBUTIONDISTRIBUTIONDETERMINEDDETERMINED
POINT OUTSIDEPOINT OUTSIDECONTROL LIMITSCONTROL LIMITS
CONCLUDECONCLUDEPROCESSPROCESS
HAS SHIFTEDHAS SHIFTEDAND UNSTABLEAND UNSTABLE
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Key Advantages of Key Advantages of EdREdR MPDMPDCost Savings
• Mitigates Capital Costs of Riser Pipe.
• Eliminates Riser Tensioning & Maintenance.
• Reduced Installation Time.
• Less Mud Volumes to Fill Riser.
• Lower Inspection & Handling Costs.
• Selection of Lower Cost Drilling Vessels.
• Less Handling = Enhanced Safety Benefits.
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Key Advantages of Key Advantages of EdREdR MPDMPDE-Duct Return Line Advantages:
• Mitigates Riser Fatigue and Joint Leaks.
• Enables Reverse Circulation.
• Increases Riser Angle Limits.
• Minimizes VIV Issues.
• Greater Degree of Vessel Drifting.
• Quicker Emergency Break-Away .
• Potential Elimination of “Pump and Dump”.
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Key Advantages of Key Advantages of EdREdR MPDMPD
Managed Pressure Drilling Allows:
• Drilling with Annular Control at all Times.
• Fewer Casing Strings.
• Improved Kick Tolerance.
• Reduced Risk of Lost Returns.
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•• STEP CHANGESSTEP CHANGESare needed in deepwater drilling systems, particularly are needed in deepwater drilling systems, particularly as we continue to explore in greater water depths.as we continue to explore in greater water depths.
•• EVOLUTIONEVOLUTIONThere are various competing step change There are various competing step change technologies regarding riserless drilling. These technologies regarding riserless drilling. These various programs continue to evolve as the enabling various programs continue to evolve as the enabling tools and new technologies come in to play.tools and new technologies come in to play.
ConclusionsConclusions
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ConclusionsConclusions
•• EXISTING TECHNOLOGYEXISTING TECHNOLOGYTremendous cost savings when drilling in Tremendous cost savings when drilling in deepwater can be achieved using existing deepwater can be achieved using existing technologies.technologies.
•• COMBINGCOMBINGexisting technology and tools that are cost existing technology and tools that are cost effective and provide a safe means of effective and provide a safe means of deepwater drilling will be the essential key to deepwater drilling will be the essential key to enabling large step changes.enabling large step changes.
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•• CHAMPIONSCHAMPIONS
Step changes occur slowly in our industry when Step changes occur slowly in our industry when no no empoweredempowered champions take the lead. champions take the lead.
Challenges to current drilling techniques in Challenges to current drilling techniques in deepwater must be made or the high associated deepwater must be made or the high associated costs will continue to be a barrier to future costs will continue to be a barrier to future deepwater exploration.deepwater exploration.
ConclusionsConclusions
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Riserless Drilling Riserless Drilling -- Applications of an Applications of an Innovative Drilling Method and ToolsInnovative Drilling Method and Tools
Greg CarterGreg CarterNautilus Offshore Company, Inc.Nautilus Offshore Company, Inc.Bill BlandBill BlandWeatherford International, Ltd.Weatherford International, Ltd.Mitchell PinckardMitchell PinckardVeriDAQ, LLCVeriDAQ, LLC
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