powerpoint presentation · powerpoint presentation author: malcolm banks created date: 11/28/2019...
TRANSCRIPT
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Acceptance
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Why Alternative Materials?
• Risk Occupational - ALARP
• Rig Recommissioning - Expense
• Recovery of Contaminated Tubing
• Rig Time to Place Cement Barriers
• Risk of Barrier Leaks - ALARP
– Integrity Longevity
– Future Environmental Impact
• Retirement Obligation, P&A >40% Cost
Rig Based Well P&A
Time Breakdown
RU/RD 4%Cementing 8%Circulating 6%Milling 12%Tripping D’Pipe 20%Tubing Recovery 50%
P&A Guidelines
P&A Guidelines – Alternative Materials
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C B A
Phase IIIEnvironmental Cap
Phase IIIntermediate
Zone
Phase IReservoirIsolation
Barrier Features
Impermeable
Non shrinking interface
Long term integrity
Resistant to downhole fluids
Withstand mechanical loads
(Remain in position)
(Wetting - bond to steel)
(Geological compatibility)
Bonded-AlloyBarriers
Theory & Material Qualification
Theory = Modelling (Reaction Kinetics, CFD and Multi-Physics)
Material Qualification = OGUK Guidelines + (Barrier Features)
Material Qualification vs Barrier Qualification
Material Qualification = OGUK Guidelines + (Barrier Features)
hardness
density
porosity
permeability
strength
modulus
5” Tubing
Alloy Barrier
Punch
Alloy PipeLoad at initial failure (tons)
Equivalent pressure
initial (PSI)
Shear bond strength Initial
(PSI)
isol8 Bonded Alloy 5" 23.2# 26.33 4363.34 1265.11
Eutectic Bismuth Tin 5" 23.2# 3.38 560.12 162.40
Barrier Qualification
- Pressure / Temperature
- Max Differential
- Deviation
- Eccentricity (Annular Barriers)
- Time
- Water / Gas
Field Trials - Objectives
• Prove Barrier Concept in Tubing, Annulus & against Geology
• Reduce P&A Occupational Risk - ALARP
• Avoid the Need for Rig Recommissioning Expense
• Leave Contaminated Tubing in the Well
• Minimise Rig Time >50% Saving
• Reduce Risk of Barrier Leaks - ALARP
– Qualification to Demonstrate Integrity Longevity
– Eliminate Future Environmental Impact
• Write-Down Asset Retirement Obligation by ~ 20%