Gallery: Statoil installs world’s first subsea wet gas compressor


Norwegian oil and gas major Statoil has informed that after several years of technology development, construction and testing, the first subsea wet gas compressor in the world is now installed at Statoil’s Gullfaks C platform in the North Sea.

Statoil informed in March that the world’s first subsea wet gas compression system was ready to be installed on the seabed and tied back to the Gullfaks C platform in the North Sea.

In May and June Gullfaks subsea compressor project (GSC) completed structure and module installation campaigns for the subsea station. Statoil has now reported that the compressors were installed at the end of June.

Subsea wet gas compression at Gullfaks C will add 22 million barrels of oil equivalent, and extend plateau production by about two years.

“The installation campaigns have been successfully performed by Subsea Seven,” says project manager Bjørn Birkeland.

According to Statoil, the project has now entered the last phase, testing and preparing for hand-over and start-up in the last quarter of this year.

“This is the first compressor of its kind in the world. It is a milestone, not just towards the compressor start-up, but also for Statoil’s subsea factory visions,” says Steinar Konradsen, owner representative for the project.

Statoil notes that the compressor station still needs to be completely tested, but that the work is underway and the project is on schedule.

Considerable preparations for the start-up of the subsea compressor have been made on Gullfaks C as well, as the work, performed by Apply Sørco, is now in the final stages, the company said.

The compressor

The compressor represents a robust and flexible measure to improve oil recovery (IOR) for the Gullfaks licence. The compressor will now be hooked up between the L and M subsea templates and Gullfaks C. It is also possible to tie in other subsea wells to the compressor through existing pipelines, it has been said in the Statoil’s press release.

This may have benefits far beyond the assumptions at the basis for the project decision, the company claimed.

“Subsea wet gas compression is a game changer for subsea processing, and an important technology to increase recovery also on other fields,” Konradsen emphasises.

The protective structure and compressor station were installed in early May by the heavy lift vessel Oleg Strashnov. On June 26, the compressor and cooling modules were lowered into place from the Seven Viking.

The plant will be tied back to the Gullfaks C platform in the late summer and autumn.

Images by: Statoil

 

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