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Bayu Undan Gas Recycle Project

largest open-water float-over installation
Office: Various 
Customer: Phillips Petroleum 
Location: Timor Sea, Australia 
Timeframe: 1996 - 2004 
Winner of the highest award in Australian Engineering; the William Hudson Award for Engineering Excellence and, at the time, the two 15,000 tonne topsides represented the world’s largest open-water float-over installation.

The Bayu-Undan field is located in the Timor Sea, approximately 500 km Northwest of Darwin, Australia, in a water depth of approximately 80m.  It is a single gas reservoir, rich in associated liquids and over three trillion cubic feet of wet gas.  1100 MMSCFD of gas is being produced along with 100,000 bpd of liquids product.  Some of the dry gas is fed to the Darwin LNG plant (via a sub-sea gas pipeline) and the remainder is recycled/re-injected into the reservoir.  The second phase of the development (a gas export pipeline to Darwin and a three million tons per annum LNG plant) was commissioned in early 2006. 
WorleyParsons’ initial responsibility was the completion of the feasibility study. Our role has continued through the definition and execution phases as a key stakeholder in the TIGA Joint Venture which executed the FEED, Detailed Engineering and procurement, engineering support for fabrication, installation, hook-up and commissioning.

This is the world’s second largest open water deck float-over (14,000 tonnes) to date. It included a 10,500 tonnes gravity based steel substructure with no piling and a process facility that includes fractionation of the wellstream fluids into butane, propane and condensate for offshore export.  Using a gravity foundation system, two jackets – with launch weights of 10,000 tonne each - were installed ahead of the installation of the float-over topsides (with a combined installation weight on 27,000 tonnes)

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