September, 2016 CSLC Prevention First Well …...Introduction Definition of well integrity: NORSOK...
Transcript of September, 2016 CSLC Prevention First Well …...Introduction Definition of well integrity: NORSOK...
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M.K. (Val) LermaSeptember, 2016
CSLC Prevention First
Well Integrity andZonal Isolation
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Introduction
Well Integrity and Zonal Isolation
• Downhole Equipment Design• Well Construction• Reservoir Characterization
• Update, Assess, Monitor• Update Well Diagram• Utilize Diagnostic Tools as Needed to Assess• Monitor Well
• Contingency Plan• Chain of Command• Options for Remedial Work• Regular Planning Meetings
• Equipment Maintenance and Personnel Training
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Introduction
Existing Regulations on Well Integrity:
• DOGGR Regulations in Title 14• API Standard 65-2, “Isolating Potential Flow Zones”
Existing Regulations may be influenced by events which have already changed regulations for Gas Storage Fields and OCS Operations
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Introduction
Definition of well integrity: NORSOK D-010
“ Application of technical, operational and organizational solutions to reduce risk of uncontrolled release of formation fluids throughout the life cycle of a well.”
There are various facets to well integrity, including accountability/responsibility, well operating processes, well service processes, tubing/annulus integrity, tree/wellhead integrity and testing of safety systems.
Source: Wikipedia
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Wellbore Construction:Barrier Diagrams
Barriers change depending on the phase of well life:• Drilling• Primary Production• Various Artificial Lift Methods• Secondary or Enhanced
Recovery• Workovers• Abandonment
The diagram should be updated any time a material change is made in the wellbore.
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ReservoirCharacterization
Pore Pressure from EMW, DST or pressure build up analysis-ensure casing can withstand burst or collapse
Fracture Pressure from leak off test, or step rate test-ensure formation can withstand pressure
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Equipment Design: Ex 1
Are You Worried?
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Equipment Design: Ex 2
Are You Worried?
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Well Update and Assessment
Start with an updated Well DiagramDiagnostic Tools• Cased Hole Well Logs: Cement Bond, may include casing condition Casing Condition (Magnetic Flux, Caliper), Noise-Temperature: casing leaks or fluid movement behind pipe
• Downhole Video vs. Camera: Fiber Optic vs. Electric Cable
• Pressure Tests: Areas of potential compromise
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Well Monitoring
What monitoring could you do to detect these leaks?
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Case History 1
Macondo
BP Deepwater Horizon Accident Investigation Report2.mp4Start at 12:30
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Case History 2
Aliso Canyon
Well Inspection Process at Aliso Canyon Storage Facility.mp4
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Conclusions
• It’s important to update well information each time well is pulled
• Obtain diagnostic information as appropriate, document findings, and make someone accountable to review and react to results
• Design a reliable monitoring program and make someone accountable to review and react to results
• Have a contingency plan in place for emergencies• Maintain equipment and train personnel
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Questions?