• Published: 20 Jun 2011
  • Incident ID: 3300

Sour gas leak from casing line failure

Cause & Consequence

  • Release of a harmful substance
Incident Consequence

Incident Location

Fixed Installation

Incident Activity


Incident Info Source

Step change in safety

Specific Incident Equipment

The break occurred between the valve and the connection to the casing, causing an uncontrolled flow of sour gas.

Lessons Identified

There were no specific procedures for obtaining well pressures and no drawings for the wellhead piping.No personnel were present who had knowledge of well configuration.Failure of previous operator to isolate tubing pressure and flow from the control line.

Incident Recommendations

Operations personnel to identify wellheads with piping configurations that are similar or confusing and have Production Engineering update P&ID’s and other process control documentation and accessible.

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