Well Integrity Incident Investigation and Mitigation Strategies

Explore a detailed analysis of a well integrity incident in February 2021, including immediate and root causes, mitigation actions, and lessons learned. The incident involved valve failure, external leaks, tubing issues, and more, impacting the installation's integrity. Learn about categorization matrices for well incidents and the severity levels associated with different issues.

• Well integrity
• Incident investigation
• Mitigation strategies
• Valve failure
• Categorization matrices

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1. Well Integrity incident Incident category Level 1 Level 2 Level 3 Level 4 Select from table Select from table Location Well type Main issue Issue keywords Producer/injector etc. Subsea/Platform Feb.2021 Illustration/well bore schematic Installation Date Select from table Select from table Background: Include important elements in detection and immediate assessments/actions Include any other relevant integrity issues Well integrity assessment conclusion: What were the immediate and root causes from the investigation? Were there other relevant problems identified? 117 reporting code Mitigating actions / well risk: Key mitigating long term actions Lessons learned / operational adjustments: Any important lessons learned or operational adjustments on the installation/field due to failure

2. Main issue Issue keyword Valve failure ASV DHSV External leak XT WH Tubing leak Seals Packer Annulus leak GLV Testing Overpressure Monitoring Hydraulics Other Corrosion Erosion Temperature Burst Control Line Collapse Cement Formation Fatigue Lifetime Maloperation Compatibility Instrumentation

3. Matrix for categorization and classification of well incidents For wells in operation/production SERIOUSNESS LEVEL Rate and amount 1. Rate > 10 kg/s or amount of > 100 kg HC gas immediate release Guidance - Barrier failure with major HC release to external environment. Volume > 500 m3 crude - Crossflow with major release to external environment. LEVEL 1 Red: Critical well integrity incidents with high risk for personnel, environment and facility 2. Rate 1-10 kg/s or amount of 10-100 kg HC gas immediate release - Critical threat to installation and personnel. Volume > 50 m3 crude '- External leak from well resulting in mobilization of emergency preparedness team. - Barrier failure with HC release to external environment. - Crossflow with release to external environment. - Serious threat to installation and personnel. LEVEL 2 Yellow: Serious well integrity incidents 1. Rate 0,1-1 kg/s or amount of 1-10 kg HC gas immediate release - External leak from well resulting in mobilization of emergency preparedness team. Volume > 1m3 crude oil

4. Matrix for categorization and classification of well incidents For wells in operation/production