Investigation Report
Seadrill – West Mira – investigation of unintentional disconnection of LMRP
Seadrill – West Mira – investigation of unintentional disconnection of LMRP
- Havtil
- Investigation Report
- Unknown
- Barrier managementHuman factorsLoss of containmentLoss of station keepingWell control
- DrillingDynamic positioningMooring operations
- Mooring linesNavigation and positioning equipmentWinch
- Alarm managementContractor managementOperating and work proceduresRisk assessment
- Upstream oil and gas
- Offshore installation
Summary
Investigation of West Mira’s unintended LMRP disconnection during drilling on the Maria field. Weather-related loss of position triggered automatic string cutting and well shut-in, with drilling fluid discharged to sea. The report examines thruster-assisted mooring, power-sharing constraints, draught changes, procedural deficiencies, alarm limits and inadequate assessment of operating assumptions.
Classifications: Barrier management; safety barrier management.
Classifications: Human factors; human performance; ergonomics.
Classifications: Loss of containment; containment loss.
Classifications: Loss of station keeping; drive-off; drift-off.
Classifications: Well control; kick control; loss of well control.
Classifications: Drilling; well drilling.
Classifications: Dynamic positioning; DP; DP operations.
Classifications: Mooring operations; berthing; unmooring.
Classifications: Mooring lines; mooring rope; mooring wire.
Classifications: Navigation and positioning equipment; ECDIS; AIS; chart plotters.
Classifications: Winch; winches.
Classifications: Alarm management.
Classifications: Contractor management; contractor assurance.
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.