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Decision framework for platform decommissioning in California
1Ojai, California, USA.
Integrated Environmental Assessment and Management
|August 12, 2015
Summary
California
Area of Science:
- Marine engineering
- Environmental science
- Offshore energy infrastructure
Background:
- California has 27 offshore oil and gas platforms nearing end-of-life (2015-2030).
- Existing regulations permit alternative uses beyond complete removal.
- Deep water depths (up to 1200 ft) present unprecedented decommissioning challenges.
Purpose of the Study:
- To establish a decision framework for decommissioning California's offshore oil and gas platforms.
- To investigate and evaluate potential decommissioning alternatives.
- To address complex technical, economic, legal, and environmental considerations.
Main Methods:
- Comparative analysis of decommissioning alternatives.
- Focus on complete removal versus artificial reefing (partial removal).
- Evaluation based on technical feasibility, economic viability, legal framework, and stakeholder acceptance.
Main Results:
- Complete removal and artificial reefing (partial removal) were identified as primary alternatives.
- California's deep-water platforms exceed the scale of previous global decommissioning projects.
- Past projects favored complete removal, with artificial reefing not implemented.
Conclusions:
- Future decommissioning decisions require navigating complex challenges and tradeoffs.
- Engineering differences between complete and partial removal are key for impact evaluation.
- A comprehensive framework is needed to manage diverse options and regulatory landscapes.
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