Investigation Report
Mixed-Fluid Release from a Subsea Well
01-06-2023 1300 MC 807 B Pollution
- BSEE
- Investigation Report
- Unknown
- Environmental protectionLoss of containmentMechanical failureWell integrity
- Well intervention
- Process pipework and pipelinesValve
- Energy and process isolationPollution reportingWell-barrier testing
- Upstream oil and gas
- Subsea
Summary
BSEE investigates a mixed-fluid release from Shell’s PN003 subsea well at Mississippi Canyon 943. ROV diagnostics identified the leak, and valve closure and pressure testing restored two barriers. Tubing and control-line separation was suspected, pending recovery and analysis. The report records revised release estimates and planned tubing replacement.
Classifications: Environmental protection; environmental safety; pollution prevention.
Classifications: Loss of containment; containment loss.
Classifications: Mechanical failure; equipment failure.
Classifications: Well integrity; well life cycle integrity.
Classifications: Well intervention; workover; well servicing.
Classifications: Process pipework and pipelines; process piping.
Classifications: Valve; valves.
Classifications: Energy and process isolation; isolation; energy isolation.
Classifications: Pollution reporting.
Classifications: Well-barrier testing; well barrier verification.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Subsea; underwater worksite.