Investigation Report
Equinor – Gullfaks C – investigation of fractures in coiled tubing
Equinor – Gullfaks C – investigation of fractures in coiled tubing
- Havtil
- Investigation Report
- Unknown
- CorrosionHydrogen sulphideLearning from incidentsMechanical failureRisk management
- Hydraulic fracturingWell intervention
- Exclusion zonesRisk assessmentSafety communicationWell-barrier testing
- Upstream oil and gas
- Offshore installation
Summary
PSA investigates coiled-tubing fractures during well clean-out following hydraulic fracturing at Gullfaks C. The report identifies hydrogen-sulphide-induced sulphide stress cracking and examines chemical compatibility, planning and risk communication. It describes well securing through the blowout preventer, deck personnel exposure during waste treatment, and shortcomings in applying previous incident experience.
Classifications: Corrosion; corrosion damage.
Classifications: Hydrogen sulphide; H2S; H₂S; hydrogen sulfide.
Classifications: Learning from incidents; incident learning; lessons learnt; lessons learned.
Classifications: Mechanical failure; equipment failure.
Classifications: Risk management; risk evaluation.
Classifications: Hydraulic fracturing; fracking.
Classifications: Well intervention; workover; well servicing.
Classifications: Exclusion zones; red zones; restricted access zones.
Classifications: Risk assessment; hazard assessment.
Classifications: Safety communication; toolbox talk; toolbox talks.
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.