Investigation Report
Subsea Hydrocarbon Leak at Thunderhorse
06-06-2022 1030 G098668 MC 778 Pollution
- BSEE
- Investigation Report
- Unknown
- Environmental protectionHydrocarbon releaseMechanical failure
- Inspection and maintenance
- Valve
- Functional testingPollution reporting
- Upstream oil and gas
- Subsea
Summary
BSEE investigates a subsea hydrocarbon leak at Thunderhorse, with an estimated release of nine barrels. ROV inspection and control-line troubleshooting identified a probable SCSSV rod piston seal failure. The report examines the pressure-trend leak detection system’s inability to detect the relatively small discharge and recommends considering policy addressing recurring seal failures.
Classifications: Environmental protection; environmental safety; pollution prevention.
Classifications: Hydrocarbon release; hydrocarbon leak; oil and gas release.
Classifications: Mechanical failure; equipment failure.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Valve; valves.
Classifications: Functional testing; function test.
Classifications: Pollution reporting.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Subsea; underwater worksite.