Investigation Report
Synthetic-Based Mud Leak During Casing Pack-Off and Wellhead Connection Testing
07-31-2007 13:00 G15607 GC/743 Pollution - BOP ring gasket/seal area
- BSEE
- Investigation Report
- Unknown
- Environmental protectionLoss of containmentMechanical failure
- DrillingInspection and maintenancePressure testing
- Blowout preventerWellhead
- Well-barrier testing
- Upstream oil and gas
- Subsea
Summary
The investigation documents a total loss of 20 barrels of synthetic-based mud during casing pack-off and wellhead connection testing. ROV observations and surface inspection identified leakage and washed seal areas. The report attributes the leak to a hydrate seal interfering with metal-to-metal sealing and records no recommendations for the regional safety office.
Classifications: Environmental protection; environmental safety; pollution prevention.
Classifications: Loss of containment; containment loss.
Classifications: Mechanical failure; equipment failure.
Classifications: Drilling; well drilling.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Pressure testing; hydrostatic testing; pneumatic testing.
Classifications: Blowout preventer; BOP; blow-out preventer.
Classifications: Wellhead; well head.
Classifications: Well-barrier testing; well barrier verification.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Subsea; underwater worksite.