Cause & Consequence
- Uncontrolled release of a flammable gas or liquid
Incident Location
Fixed Installation
Incident Activity
Production operations
Specific Incident Equipment
Stem seal on double block and bleed
Lessons Identified
Presence of gas in a SSSV hydraulic control line and leakage out through the above valve stem leading to gradual accumulation of gas inside a sealed wellhead instrument cabinet:
• Gas migration to surface through the SSSV hydraulic control line tubing.
• Inadequate long term isolation of a pressurised Hc system.
• Inadequate risk assessment of the isolation following SSSV removal.
Incident Recommendations
Investigate the adequacy of the well isolation for typically this situation of SSSV being removed.
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