Ichthys

Heerema Marine Contractors (HMC) has completed installation of infield flowlines for Inpex-operated Ichthys LNG project in the Browse Basin, 220km offshore from Western Australia.

The last 18in production flowline on the seafloor were laid down using HMC’s deepwater construction vessel (DCV), Aegir.

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The new vessel Aegir has capabilities that include heavy-lift, J-lay and Reel-lay.

DCV Aegir reeling method was used to install 53km of 6in and 8in carbon steel MEG and 12in corrosion-resistant alloy (CRA) clad condensate flowlines.

HMC used DCV Aegir’s J-lay method to install 87km of 18in CRA production flowlines.

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HMC CEO Jan Pieter Klaver said: "The complete Ichthys project is of an unprecedented scale in HMC’s subsea track record.

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"Once operational, the project is expected to produce 8.9 million tonnes of LNG and 1.6 million tonnes of LPG per annum."

"It involves marshalling, transporting and lowering almost 120,000t of project materials to the seabed in water depths up to 275m in a remote area of the Indian Ocean unprotected against swells and cyclonic summer conditions.

"HMC now looks forward to seeing Aegir completing the remaining heavy-lift and mooring chain installation work on Ichthys in a similar safe and successful manner."

The lchthys project is a joint venture between Inpex (62.25%), Total (30%), CPC (2.625%), Tokyo Gas (1.575%), Osaka Gas (1.2%), Kansai Electric (1.2%), Chubu Electric Power (0.735%) and Toho Gas (0.42%).

Gas from the Ichthys field will undergo preliminary processing offshore to remove water and extract condensate and would be later exported to onshore processing facilities in Darwin through an 889km subsea pipeline.

Once operational, the project is expected to produce 8.9 million tonnes of LNG and 1.6 million tonnes of LPG per annum.

Image: Ichthys project offshore facilities. Photo: courtesy of Heerema Marine Contractors.