Investigation Report
Neptune/Odfjell – Gjøa/Deepsea Yantai – investigation of well incident
Neptune/Odfjell – Gjøa/Deepsea Yantai – investigation of well incident
- Havtil
- Investigation Report
- Unknown
- Barrier managementLearning from incidentsMechanical failureRisk managementWell control
- DrillingPressure testing
- Blowout preventer
- Management of changeOperating and work proceduresRisk assessmentWell-barrier testing
- Upstream oil and gas
- Offshore installation
Summary
Investigation of a parted drillstring at Gjøa examines stuck pipe, weaker continuous-circulation connections and multiple drill-pipe sections obstructing the blowout preventer. It analyses mud-weight constraints, missing torque information and deficiencies in change management and risk assessment. Barrier status remained uncertain until cementing secured the well 30 days after the incident.
Classifications: Barrier management; safety barrier management.
Classifications: Learning from incidents; incident learning; lessons learnt; lessons learned.
Classifications: Mechanical failure; equipment failure.
Classifications: Risk management; risk evaluation.
Classifications: Well control; kick control; loss of well control.
Classifications: Drilling; well drilling.
Classifications: Pressure testing; hydrostatic testing; pneumatic testing.
Classifications: Blowout preventer; BOP; blow-out preventer.
Classifications: Management of change; MOC; change management.
Classifications: Operating and work procedures.
Classifications: Risk assessment; hazard assessment.
Classifications: Well-barrier testing; well barrier verification.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.