Investigation Report
Shallow Water Flow from Wellhead Cement Port During Riserless Drilling
03-28-2021 01:00 G34529 GB 962 Pollution - Surface - Shallow Water Flow
- BSEE
- Investigation Report
- Unknown
- Hydrocarbon releaseWell controlWell integrity
- DrillingROV operationsWell abandonment
- Remotely operated vehicleWellhead
- Upstream oil and gas
- Subsea
Summary
BSEE investigates shallow water flow from a wellhead cement port during riserless drilling at Garden Banks Block 962. Fluid analysis detected limited hydrocarbons. Logging and ROV monitoring examined cement channelling; investigators identified salt contamination as the probable cause. Shell subsequently decided to temporarily abandon the well.
Classifications: Hydrocarbon release; hydrocarbon leak; oil and gas release.
Classifications: Well control; kick control; loss of well control.
Classifications: Well integrity; well life cycle integrity.
Classifications: Drilling; well drilling.
Classifications: ROV operations; remotely operated vehicle operations.
Classifications: Well abandonment; plug and abandonment; P&A.
Classifications: Remotely operated vehicle; ROV; underwater robot.
Classifications: Wellhead; well head.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Subsea; underwater worksite.