Schlumberger said Oct. 31 that OneSubsea has been awarded by A/S Norske Shell a frame agreement for an engineering, procurement, construction and installation (EPCI) contract for the supply of a subsea multiphase compression system for the Ormen Lange Field in the Norwegian Sea.

Through the EPCI contract, OneSubsea, the subsea technologies, production and processing systems division of Schlumberger, and its subsea integration alliance partner Subsea7 will supply and install a subsea multiphase compression system that uses the industry’s only subsea multiphase compression technology. OneSubsea will, in the first phase of the project, do the engineering and design of the complete system. Following the final investment decision by the license group, the complete scope of the EPCI will be executed.

The compression system will be powered and controlled from the Nyhamna onshore gas processing plant, which is 120 km from the subsea location. This tieback distance is also a world record for transmitting variable speed power from an onshore facility to equipment on the seabed.

The system will be installed at 850 m of water depth and comprises two 16-MW subsea compression stations tied into existing manifolds and pipelines. This multiphase compression system is surge tolerant, does not require wellstream preprocessing, and is adaptable to the varying conditions over the life of the field.

“Our subsea multiphase compression system is a robust, compact and cost-efficient solution that will help Shell unlock the full potential of the Ormen Lange Field. Our unique wet gas compression technology can also help customers lower their carbon footprint,” Don Sweet, president, OneSubsea, said.

OneSubsea multiphase compression technology results in a simpler, more affordable and easier-to-install subsea compression system. By lowering backpressure on the reservoir, this technology helps customers increase recovery and extend the life of their gas developments.

Offshore