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INPEX announces completion of Ichthys subsea installation

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LNG Industry,

INPEX has announced that it has completed the installation of the subsea infrastructure and equipment to extract gas and condensate from the Ichthys field for the Ichthys LNG project.

The final laying of 49 km of umbilicals and flying leads marked the last placement of an intricate subsea network, spread across a 400 km2 area of the Ichthys field in the Browse Basin, located approximately 220 km offshore Western Australia.

Louis Bon, Ichthys Project Managing Director, said: “Since October 2014, hundreds of people have worked offshore without any significant safety incidents to install the Ichthys LNG Project’s 133 000 t subsea network.

“Carrying out this work more than 200 km out to sea in water depths of around 250 m involves substantial planning and logistical challenges to manage crew changes and equipment transportation.

“Safely completing these complex tasks is a tribute to the world-class processes we have in place and the commitment of our personnel to ensure the protection of our people and the environment.”

The extensive subsea gathering system includes the following: a 110 m high riser support structure; five manifolds; 139 km of flowlines; 49 km of umbilicals and flying leads; 2640 t of production and MEG spools; five subsea distribution units; and a subsea distribution hub.

The finalisation of the subsea installation signified that the project was now ready for the arrival of a central processing facility (CPF) and floating production, storage and offloading (FPSO) facilities, currently under commissioning in South Korea.

The offshore facilities will be towed to the Ichthys field once commissioning activities in South Korea have finished. Once they arrive, they will be moored by 40 000 t of chain secured to more than 25 000 t of foundation piles. The offshore facilities will have an operational life of 40 years.

A remaining umbilical will be installed during the hook-up campaign for the CPF and FPSO.

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