Investigation Report
Dynamic Positioning Malfunction with Riser Disconnection and Brine Release During Well Completion
12-02-2007 13:30 G21810 GC/652 Pollution - Riser Emergency Disconnect
- BSEE
- Investigation Report
- Unknown
- Environmental protectionHuman factorsLoss of containmentLoss of station keeping
- Dynamic positioningInspection and maintenance
- Navigation and positioning equipmentOperator displays and control interfaces
- Alarm managementCompetence and trainingFunctional testingOperating and work procedures
- Upstream oil and gas
- Marine watersOffshore installation
Summary
Investigation of a dynamic positioning malfunction during well completion and console maintenance. Corrupted control data and subsequent troubleshooting caused the rig to leave its watch circle, triggering riser disconnection and releasing approximately 550 barrels of sodium bromide brine. Planned changes address alarms, command timing, console verification and simulator training.
Classifications: Environmental protection; environmental safety; pollution prevention.
Classifications: Human factors; human performance; ergonomics.
Classifications: Loss of containment; containment loss.
Classifications: Loss of station keeping; drive-off; drift-off.
Classifications: Dynamic positioning; DP; DP operations.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Navigation and positioning equipment; ECDIS; AIS; chart plotters.
Classifications: Operator displays and control interfaces.
Classifications: Alarm management.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Functional testing; function test.
Classifications: Operating and work procedures.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Marine waters.
Classifications: Offshore installation; offshore platform; offshore rig.