well integrity overview 2
TRANSCRIPT
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Well Integrity Overview
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Well Integrity – what does it all mean!
Definition of Well Integrity
Well Integrity is the Design, Installation, Operation and Maintenance of all Well Equipment to a standard that ensures the Safe Containment of
Produced Well Fluids & Injectants for the Life of the well.
Keep the hydrocarbons in the pipe !
Why is Well Integrity Important?
It’s about the safety of people, our equipment and our business
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This is what we want to avoid!Why is Well Integrity Important?
It can help to prevent incidents like this
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Integrity Drivers & Implementation
• Safety • Statutory regulations • Internal Policy &
Standards • Production • Reputation
• Technical & Performance Standards
• Procedures • Industry Standards • Vendors Procedures • Knowledge , Training
& Competency
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Well Integrity Minimum Standards Standard / Element No What , Where & How ?
1) Accountable Person Wells Technical Authority
2) Well Operating Procedures Well Handover Process & Operate Wells
3) Well Intervention Procedures Field Specific Procedures
4) Tubing / Casing Integrity Management Field Specific Procedures
5) Xmas Tree Maintenance & Testing Policy
Field Specific Procedures & Planned maintenance routines (PMR’s)
6) DHSV / ASV Integrity Management Field Specific Procedures & Planned maintenance routines (PMR’s
7) Knowledge Management Drilling & Well Operations Policy
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Well Construction Principles • Generally a well will consist of conductor, casing,
tubing, wellhead and Christmas tree.• The conductor protects the casing from seabed to
platform surface, and provides a stable support for the wellhead and Christmas tree.
• Three or four strings of casing will be run inside the conductor, with diminishing I.D’s
• Typically 30” conductor.• 20” Surface Casing • 13.3/8” Intermediate Casing• 9.5/8” Production Casing • 7” Liner
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Casing Design : Basic Construction
12
3
67
9
11
10
1. 30” conductor
2. Conductor setting depth
3. 20” surface casing
4. 20” shoe
5. Cement
6. Formation open to C annulus
7. 13 3/8” casing
8. Formation open to B annulus
9. 9 5/8” production casing
10. Liner hanger
11. 7” Liner
12. TD – Total Depth
12
4
5
8
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Completion Components – What’s installed
1
2
4
7
9 10
1112
6
1. Tubing hanger (Upper annulus barrier)2. SC-SSSV (Sub-surface barrier)3. Control line4. Tubing (Vertical barrier)5. A annulus (tubing-casing)6. Gas lift valves (in SPMs)7. Expansion joint: Tubing Seal Receptacle8. Anchor seal assembly9. Production packer10. Packer sealing element (Lower barrier)11. Tailpipe12. WEG
5
3
9 5/8”Production
Casing
8
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Completion Components – Why?
Function : 1
2
4
7
9 10
1112
6
1. Upper annulus barrier & supports tubing2. Protects the surface installation 3. Hydraulically operates the SC-SSSV4. Conveys hydrocarbons to surface5. Protects production casing from attack6. Permit entry of lift gas annulus to tubing7. Accommodates expansion / contraction8. Ties & seals tubing string to packer9. Anchors tubing string to production csg10. Forms lower barrier of the A annulus11. Allows installation of instrumentation12. Easy entry of production logging tools
back into tailpipe
5
3
9 5/8”Production
Casing
8
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Annular Safety Valve - Gas Lift
The ASV contains large amounts of pressurised gas in the tubing-casing annulus – should the well-head become damaged
An 8,500 ft annulus contains large quantities of lift gas when pressured up to 1800 psi
Provides annular by-pass via a hydraulically operated valve array
Lift Gas
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Annular Safety Valve - Closed
Lift gas above ASV escaped to surface following loss of surface systems integrity
Evacuated Lift GasASV in Closed Position
Lift gas retained in A annulus below ASV
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Integrity DriversIntegrity Drivers
The Well Integrity Envelope
DHSVs - Regular integrity & function testing
Xmas Trees - Regular Maintenance and Testing
Annuli – Regular monitoring & reporting
Report and Action if set criteria do not meet expectations.
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Why monitor annuli pressures ?
• The annular voids form the principal barriers between the produced fluids and the atmosphere.
• By monitoring the annulus pressures we are able to assess the condition and integrity of the well tubulars.
• Anomalous annulus pressures may give the first indication of down hole problems although it does not automatically mean there is a leak
• Thermal expansion or ingress of formation fluid could also cause an increase in annulus pressure, regular sampling of annulus fluids may also be undertaken
• Annulus temperatures should also be considered
Definition :
“the area between two concentric circles” “a ring shaped part , figure or space”
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Annulus Monitoring - Well Start-up
Tbg A B C Formn
Increasing distance from tubing
Depth
Tubing, Annulus & Formation Temperature
Hot Cool
ABCABC
Formation
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Cuttings Re-Injection
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Recommended Annuli Naming Convention
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Example of Collapsed Tubing