Problem Statement
- The wells were temporarily abandoned and experienced sustained casing pressure (SCP). The suspected sources of microchannel leaks include:
- Isolation plug leak
- Perforation squeeze leak
- The maximum pressure recorded in Sections C and D exceeded 1000 psi.
Challenges
- Rig-less operation requiring small-footprint, fit-for-purpose equipment.
- Logistics constraints due to the remote location.
- Fluid compatibility and density concerns.
- Well construction integrity.
Objective
- To seal gas migration and surface pressure buildup caused by cement plug leaks using engineered epoxy resin with a higher density than the existing completion fluid.
- Implement an effective sealant placement method using macaroni tubing for mud circulation and resin injection above the cement.
Solutions
- Perform Well Leak Diagnostics which includes:
- Injectivity tests.
- Pressure build-up (PBU) rate analysis.
- Surface integrity pressure testing.
- Sealant placement through macaroni tubing.
- Squeeze and position the resin plug above the leak area (within MASP).
- Rectification Acceptance Criteria:
- Perform post-treatment integrity testing.
- Compare PBU rates before and after sealant placement.
Results
- Successfully injected sufficient amount of resin plug via macaroni string.
- Cured resin under surface pressure within 24 hours.
- No PBU recorded post-sealant treatment.
- Fit-for-purpose equipment performed as intended.
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