• Published: 27 Mar 2014
  • Incident ID: 3513

Gas weep occurred from a valve stem seal serving as isolation from a SSSV control line

Cause & Consequence

  • Uncontrolled release of a flammable gas or liquid
Incident Consequence
Hydrocarbon release

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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