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Incident Date: | 28/05/2010 |
Summary: | Two contractors were in the process of obtaining pressure readings from the production casing tubing annulus, when a ¼ inch line off the casing failed and sour gas began leaking to the atmosphere. Sour Gas is defined as natural gas or any other gas containing significant amounts of hydrogen sulfide |
Incident consequences (potential or actual): | Injury |
Cause of accident or incident: | Release of a harmful substance |
Activity Location: | Fixed Installation |
Activity Type: | Inspection/testing |
Description: | Sour Gas leaked from a connection between the valve and the casing. |
Specific Equipment: | The break occurred between the valve and the connection to the casing, causing an uncontrolled flow of sour gas. |
Lessons Learnt: | 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. |
Task Description: | Obtaining pressure readings from the production casing tubing annulus. |
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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Contact Details: | Step Change in Safety |
Figures: | No figures available. |
| Posted: 7/06/2010 |
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