Investigation Report
Emergency Disconnect and Calcium Chloride Release Following Loss of Station Keeping
05-29-2025 1046 G22868 MC 300 Pollution - Emergency Disconnect Sequence
- BSEE
- Investigation Report
- Unknown
- Environmental protectionLoss of containmentLoss of station keeping
- DrillingDynamic positioning
- Emergency response
- Upstream oil and gas
- Vessel
Summary
BSEE investigates weather-driven loss of station keeping aboard the Noble Stanley Lafosse drillship during preparations for cementing. The crew initiated an emergency disconnect, closing blind shear rams and releasing an estimated 417 barrels of calcium chloride to sea. The report examines forecast limitations, vessel excursions and the decision to disconnect; no injuries were reported.
Classifications: Environmental protection; environmental safety; pollution prevention.
Classifications: Loss of containment; containment loss.
Classifications: Loss of station keeping; drive-off; drift-off.
Classifications: Drilling; well drilling.
Classifications: Dynamic positioning; DP; DP operations.
Classifications: Emergency response; emergency preparedness.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Vessel; aboard ship; onboard vessel.