The first of 49 foundation piles were deployed and driven into the seabed at Inpex’s Ichthys field, offshore Western Australia, as part of an ongoing installation campaign, the operator announced on 8 May.
Inpex said that each pile measures 66m long and weighs more than 450 tonnes. The current offshore campaign calls for the installation of 30,000 tonnes of subsea infrastructure equipment across the Ichthys field.
Ichthys Project Managing Director Louis Bon said in a company statement that installation of the complex network of subsea infrastructure and equipment across the 800sq km Ichthys field was progressing well. “The mooring work is being carried out specifically to prepare for the arrival of the project’s two big offshore facilities – the central processing facility and the floating production, storage and offloading facility.”
The central processing facility (CPF) and floating production, storage and offloading (FPSO) facility are currently under construction in South Korea. The CPF, a column-stabilized semisubmersible production unit, is being built by Samsung Heavy Industries shipyard in Geoje. The 336m-long, 59m-wide, FPSO is designed to hold more than 1 MMbo of condensate and is being built by Daewoo Shipbuilding & Marine Engineering (DSME) shipyard in Okpo. Once completed, they will be towed to the Ichthys field in 2016 and moored for the life of operations – about 40 years – by 40,000 tonnes of chain secured to about 20,000 tonnes of foundation piles.
The mooring installation project is being managed by Heerema Marine Contractors (HMC) Australia – under subcontract to the lead contractor McDermott Australia – using the deepwater construction vessel DCV Aegir.
Moorings will be installed by DCV Aegir in non-continuous phases, with piles driven first and mooring chains laid out later in the campaign.
As of May 2015, the Ichthys LNG Project had installed 47km of flowlines, more than 30 flowline sleeper structures and a 6500 tonne riser support structure (RSS) in the Ichthys field as part of the offshore installation campaign, which began in October 2014.
The Ichthys field is located in the Browse Basin in the Timor Sea approximately 200km off Western Australia and 800km southwest of Darwin. Over the 40-year initial design life of the Ichthys LNG Project, up to 50 subsea production wells will be drilled into reservoirs 4000-4500m beneath the seabed. The Ichthys LNG project is expected to produce 8.4MPTA of LNG and 1.6MPTA of LPG, along with approximately 100,000 b/d of condensate at its peak. First production is due in 2016.
Inpex operates Ichthys with 62.2% interest. Its partners include Total (30%), CPC Corp., Taiwan (2.625%), Tokyo Gas (1.575%), Osaka Gas (1.2%), The Kensai Electric Power Co. (1.2%), Chubu Electric (0.735%) and Toho Gas (0.42%)
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