Investigation Report
Wellhead Releases Mud, Water and Cement During Annular Cement Squeezing
03-08-2005 20:15 G23933 ST/242 Blowout
- BSEE
- Investigation Report
- Unknown
- Loss of containmentMechanical failureWell control
- DrillingPressure testing
- Wellhead
- Evacuation, escape and rescuePre-use checksWell-barrier testing
- Upstream oil and gas
- Offshore installation
Summary
Investigation of a wellhead release during annular cement squeezing on Diamond Ocean Champion. A lock-down dog failed or became unscrewed, releasing mud, water and cement. The narrative describes evacuation and subsequent well securing, and records proposed wellhead checks, pressure testing and cementing measures. The attachment contradicts the narrative on evacuation.
Classifications: Loss of containment; containment loss.
Classifications: Mechanical failure; equipment failure.
Classifications: Well control; kick control; loss of well control.
Classifications: Drilling; well drilling.
Classifications: Pressure testing; hydrostatic testing; pneumatic testing.
Classifications: Wellhead; well head.
Classifications: Evacuation, escape and rescue; EER; escape and rescue.
Classifications: Pre-use checks; pre-use inspection.
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.