The California Public Utility Commission (CPUC) and the Division of Oil, Gas, and Geothermal Resources (DOGGR) published their findings for the Southern California Gas Company, Aliso Canyon Gas Storage SS-25 Incident. The report concludes the ruptured production casing was due to external microbial corrosion. Root cause analysis findings included:
- Risk assessments were not conducted to assess the wells for integrity
- Previous casing failures were not investigated
- Casing wall thickness inspections were not required by regulations and were not routinely performed in all wells
- Well flow rate was underestimated for well SS-25
- Well kill modeling was not conducted for the first 6 kill attempts
- No well surveillance at Aliso Canyon
- Single barrier production casing
The report does indicate that new regulations from DOGGR and Southern California Gas Company’s current integrity management practices address most of the root causes. The report, and a really interesting video that summarizes the history of SS-25 and the events leading up to and immediately after the failure, can be found on the CPUC website.
Underground Gas Storage
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