Investigation Report
Seadrill – West Hercules – investigation of unintentional disconnection of LMRP
Seadrill – West Hercules – investigation of unintentional disconnection of LMRP
- Havtil
- Investigation Report
- Unknown
- Barrier managementHuman factorsRisk managementWell control
- Drilling
- Blowout preventerValve
- Competence and trainingManagement of changeOperating and work proceduresRisk assessment
- Upstream oil and gas
- Offshore installationSubsea
Summary
Investigation of an unintended riser-package disconnection on West Hercules during drilling preparations in the Barents Sea. An incorrectly installed ADS trigger valve initiated disconnection and automatic shear-ram closure against uncuttable drill collars. The report examines installation risk assessment, competence, procedures, maintenance, change management and operator oversight, distinguishing actual damage from potential well-control consequences.
Classifications: Barrier management; safety barrier management.
Classifications: Human factors; human performance; ergonomics.
Classifications: Risk management; risk evaluation.
Classifications: Well control; kick control; loss of well control.
Classifications: Drilling; well drilling.
Classifications: Blowout preventer; BOP; blow-out preventer.
Classifications: Valve; valves.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Management of change; MOC; change management.
Classifications: Operating and work procedures.
Classifications: Risk assessment; hazard assessment.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.
Classifications: Subsea; underwater worksite.