Offshore/subsea systems

Life-Extension Project Applies Assessment of Reinforced Concrete to Nonjacket Structures

The complete paper discusses structural assessments for gravity-based structures, a topic that the authors write is underrepresented in the literature.

Wandoo B concrete GBS general arrangement.
Fig. 1—Wandoo B concrete GBS general arrangement. LAT=lowest astronomical tide.

Wandoo B is a concrete gravity-based structure (GBS) and is the main production facility for the Wandoo field offshore northwest Australia. It was installed in 1997 with a design life of 20 years. The structural assessments discussed in this paper are part of a comprehensive life-extension project encompassing wells, subsea systems, marine and safety systems, and topsides facilities and structures to demonstrate fitness for service through the end of field life.

Background

The GBS serves as the support structure for the Wandoo B facility and provides oil storage for the Wandoo field. The structure has four shafts approximately 11 m in diameter that support the topsides facilities and a base structure with permanent ballast and oil storage cells (Fig.

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