Reliable engineering and design methods facilitate mooring floating systems next to offshore structures in more conditions than ever before.
Hart's E&P, June 2010
Authors: Michael O’Driscoll, Ben Boone, and Kent Longridge, InterMoor Inc.
Mooring accommodation barges, work barges, and tender-assisted drilling (TAD) units in close proximity to other offshore structures is common practice in the offshore oil and gas industry. As the necessity for these structures expands into new environments, mooring system providers are working to provide comprehensive design, analysis, procurement, fabrication, and installation services to meet changing needs.
Meeting needs head on
Over the past 10 years, InterMoor Inc. has become increasingly involved in mooring floating bodies close to other offshore structures. Since 2002, InterMoor has moored barges and semi-submersibles next to dynamically positioned drilling rigs, jackups and fixed jackets around the world.
Most recently, InterMoor completed a challenging mooring installation offshore Angola. This 2008-2009 development consisted of a drilling and production platform (DPP).
During this project, the TAD was used to install drilling equipment within the DPP’s topsides and would be connected with a personnel transfer bridge (PTB) during normal drilling operations. Initially, the TAD remains moored on location for four to five years and thereafter returns intermittently as needed over the course of the remaining 15 years. This TAD would be moored on location for eight to 10 years. The mooring was designed and installed to achieve a tight watch circle and to meet permanent mooring system requirements.
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