practices followed to ensure “well integrity during …
TRANSCRIPT
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PRACTICES FOLLOWED TO ENSURE“WELL INTEGRITY” DURING
WORK OVER OPERATIONS&
WELL COMPLETION INOIL INDIA LIMITED
Sanjay Verma Binay Chetri
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PRESENTATION COVERS
Basic concept on Well Integrity, Barriers & types of Failures in wells.
A road map to ensure well integrity in OIL.
A Case study.
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WHAT IS WELL INTEGRITY?
“Well Integrity is the design, installation, operation and
maintenance of all the well equipment to a standard that ensures safe containment of well fluids (produced or injected) over the
entire life of the well”
Keep the hydrocarbons in the pipe!
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WELL INTEGRITY –INFLUENCING FACTORS
• CompositionNature of production and injection fluids.Suspended Solid Produced with well fluids.Water Cut
• EnvironmentNature of formation fluid behind casing.Pressures and temperatures.Flow rate & Regimes
• PhysicalWell Life.Cumulative oil/water production.Completion types.
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WELL BARRIERS
For Well integrity we need barriers which needs to be defined.Well barriers are envelopes which prevents fluids or gases from flowing unintentionally, from the formation into another formation or to surface.
Primary Barrier Secondary Barrier
BARRIERS CLASSIFICATIONS
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SECONDARY BARRIER
PRIMARY BARRIER
Casing & Casing Cement
Packer
Lower MV
Cement
Casing
Upper MV
Annulus Valves
TRSSSV
Tubing Hanger
Top & Side Valve
Tubing
Lower MV
BARRIER DESIGN IN OIL INDIA LTD
SIGNIFICANCE OF WELL BARRIERS
Two independent & tested barriers.If one of the barrier fails then all the activities in the well shall be directedtowards restoring the barrier.
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Surface Failure X Mass Tree & Annulus Valves, Tubing & Casing Hanger Seals, etc
Sub Surface Failure Completion String, Casing, Cement behind Casing, etc
Combine Surface and Sub Surface Failure
FAILURE OF WELL BARRIERS
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POSSIBLE LEAK PATHS-IN COMPLETIONSTRING (SUB SURFACE FAILURE)
Tubing Hanger Seal
Tubing & Connections
TR SSSV Control Line
Gas Lift Valves
Prod Packer
SSD
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POSSIBLE LEAK PATH FROM CASING(SUB SURFACE FAILURE)
Casing Hanger Seal – Leak to B Annulus Casing Leak – Leak to/from B Annulus
Casing Leak – leak to/from FormationCement Bond failure – resulting communication with other formation
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ROAD MAP TO WELL INTEGRITYMANAGEMENT
Well Data
Inspection and Record Generations
Risk Assessment & Planning
Work over
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Well DataWell Development NoteCompletions reportsOther Reports(BHP, Hole Probing, fish details if any etc)
Inspection and Record GenerationsVisual InspectionPressure Monitoring
ROAD MAP TO WELL INTEGRITYMANAGEMENT
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Risk Assessment & Planning
No Risk Well : No Failures.Medium Risk Well: Needs to repair on scheduled work over. High Risk Well: Require immediate action .
ROAD MAP TO WELL INTEGRITYMANAGEMENT
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WORK OVER OPERATION
Subside the well with kill fluid POOH Production stringCasing scrapper tripRecord LogsRestore integrity
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Primary Barrier
Secondary Barrier
Fluid Column
CasingCasing CementWell Head SealsAnnulus VavesDrilling BOP
BARRIERS DURING WORK OVER OPERATION
A Annulus
B Annulus
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BARRIER TEST / REPAIR
Testing primary / secondary Seals Casing Test & RepairIsolation RepairA Annulus
B Annulus
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TESTING PRIMARY SEALS
B A
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TESTING PRIMARY SEALS
B A
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CASING & ISOLATION REPAIR
• Casing Repair USIT Log Casing Damage HuntingCement Squeeze /Casing Patch
• Isolation repairCVL-VDL LogsCement Squeeze
A Annulus
B Annulus
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WELL COMPLETIONS
Oil India Limited has three basic types of well completions based on flow, namely:
Gas well Self Flowing Oil WellArtificial Lift Well
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WELL COMPLETION
• Gas Well Premium Thread Tubing'sRetainer Packer with extended Seal BoreTwo Master ValveTR-SSSV (Tubing Retrieval Sub Surface Safety Valve).
• Self Flowing Oil WellCombination of P-110 & N/L-80 tubing.Hydraulic Packer or Mechanical Packers.
• Artificial Lift Well (Gas Lift Well) N-80 or L-80 tubing's.Completed with GLV & Packer.
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COMPLETION EQUIPMENTS CHECKS/TESTS ATWORKSHOP
• Gas Lift Valve & MandrelsConventional GLM minimises chances of leak.Gas lift Valves and Mandrels hydro test.
• Hydraulic PackersThe ball, seat & shear pins checked.Hydro test up to 200 Psi.
• Hook Wall PackersFunction test of the HW Packers.
• X Mass Tree Function test of valves & Hydro test.
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GAS LIFT VALVE & MANDREL HYDRO TEST ONWORKSHOP
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HYDRAULIC PACKER HYDRO TEST ONWORKSHOP
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Packer with or without GLV’sX Mass Tree is Rig up Packer is set and hydro tested
TESTING OF COMPLETION EQUIPMENTS
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CASE STUDYINTEGRITY REPAIR
BRIEF HISTORY Development Oil Well Completed on March 2000.Initial Production, oil 92 klpd, Bean- 5 mm, FTHP - 3000 Psi, GOR - 122 scum/kls.April’ 2010, sharp decline with a high water cut was observed. The tubing punctured at 1200 m in to facilitate gas lifting.December’2011, existing perforations sand was plugged back using through tubing bridge plug (MPBT) & Perforated.During Testing the higher up sand the SITP-SICP-2300 Psi & Pressure Built was observed on 9 5/8” X 5 ½” B-Annulus of 1150 Psi. Decided for urgent workover.
A B
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CASE STUDY -INTEGRITY REPAIR
The USIT log showed suspected casing damage in the range 1681-1685m, 1855-1860m, 2314-2315 m.
1855-1860 m
1681-1685 m
2314-2315 m
• Cement Plug placed 2390 – 2470 m.
• Hi-Vis pill placed 2800 - 2470 m.
• Using Hook Wall Packer Leak detected 1190 - 1247 m.
A Annulus
B Annulus
• Recorded CBL-VDL
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Casing Damaged in between 1190 -1247 m.
1190-1247 m
• Cement squeezed into B Annulus Top Plug displaced up to 1165 at Max 1000 Psi on surface.
• Cement is cleaned up to 2317 m.
• Hi-Vis pill placed 1255 -1655 m.
• A Positive at 1000 Psi is carried out and found OK
CASE STUDY -INTEGRITY REPAIR
A Annulus
B Annulus
• Decided for Cement Squeezed Job
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WELL COMPLETION – AFTER REPAIR
AFTER INTEGRITY REPAIR THE WELL PRODUCED@35 KLPD WITH FTHP-1900 PSI.
$$$
A B
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THANK YOU
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LOG’s OF THE WELL
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LOG’s OF THE WELL
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LOG’s OF THE WELL
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