Course Outlines

Introduction to Offshore Decommissioning & Abandonment
Decommissioning Legislation Framework
Practical Considerations
Decommissioning Programme
Techniques & Tools
Safety Regulations
Pipelines, Offshore / Subsea Systems Decommissioning.
BP Miller Platform Decommissioning

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Course Outlines

Executive Summary
Background Information
Description of Items to be Decommissioned
Inventory of Materials
Removal & Disposal Options
Selected Removal & Disposal Option
Wells
Drill Cuttings
Environmental Impact Assessment
Interested Party Consultations
Costs
Schedule
Project Management & Verification
Debris Clearance
Post-Decommissioning Monitoring & Maintenance
Supporting Studies

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A fixed platform is a type of offshore platform used for the production of oil or gas. These platforms are built on concrete and/or steel legs anchored directly onto the seabed, supporting a deck with space for drilling rigs, production facilities and crew quarters. Such platforms are, by virtue of their immobility, designed for very long term use. Various types of structure are used, steel jacket, concrete caisson, floating steel and even floating

Steel jackets are vertical sections made of tubular steel members, and are usually piled into the seabed. Concrete caisson structures, pioneered by the Condeep concept, often have in-built oil storage in tanks below the sea surface and these tanks were often used as a flotation capability, allowing them to be built close to shore (Norwegian fjords and Scottish firths are popular because they are sheltered and deep enough) and then floated to their final position where they are sunk to the seabed. Fixed platforms are economically feasible for installation in water depths up to about 1,700 feet (520 m).

The Iwaki Platform is located approximately 40km east of Nahara Cho in the Fukushima prefecture of Japan, and was installed in 1983 after the Iwaki Gas Field was discovered in 1973.

The decommissioning of the platform was awarded to Nippon Steel Engineering Co Ltd, and subsequently SapuraAcergy Sdn Bhd was awarded the offshore scope of work which included the decommissioning of the topsides, jacket, and associated secion 12″ gas export pipeline. This work was executed using the Sapura 3000 vessel and was completed in early 2010.

The heavy lift system features:

Non-intervention rigging
Single-piece removal
Improved schedule
Reduced hazardous exposure