World’s first subsea wet gas compression starts

October 12, 2015

Norway’s Statoil with partners Petoro and OMV has initiated the world’s first wet gas compression on the seabed of the North Sea Gullfaks field.

According to Statoil, the technology will increase recovery by 22 million barrels of oil equivalent (oe) and extend plateau production by around two years from the Gullfaks South Brent reservoir.

“We are very proud that we have been able to complete such a demanding pioneering project with start-up ahead of the original plan,” says Margareth Øvrum, executive vice president for Technology, Projects & Drilling (TPD).

“Subsea processing and gas compression represent the next generation oil and gas recovery, taking us a big step forward,” she says.

Statoil is the first company to apply subsea gas compression. In mid-September Statoil also started Åsgard subsea gas compression.

The two projects are the first of their kind worldwide, Statoil says, and represent two different technologies for maintaining production when the reservoir pressure drops after a certain time.

Subsea compression has stronger impact than conventional platform-based compression Statoil further explains, adding that it is furthermore an advantage that the platform avoids increased weight and the extra space needed on the platform for a compression module.

“This is one of several important projects on Gullfaks for improved recovery and field life extension. The recovery rate from the Gullfaks South Brent reservoir may be increased from 62% to 74% by applying this solution in combination with other measures,” says Kjetil Hove, senior vice president for the operations west cluster.

It is also possible to tie in other subsea wells to the wet gas compressor via existing pipelines. The station has already been prepared for new tie-ins.

“We see great opportunities for wet gas compression on the Norwegian continental shelf. It is an efficient system and a concept that can be used for improved recovery on small and medium-sized fields. We are searching for more candidates that are suitable,” says Hove.

The subsea gas compressor used on Gullfaks was supplied by OneSubsea.

Offshore Energy Today last week interviewed Arne Birger Olsen, Director Sales – ECR at OneSubsea. In the interview, we talked about OneSubsea’s latest technology development, the world’s first subsea wet gas compression system, and its importance for the industry.