PARIS – OneSubsea has contracted Nexans to design and supply two 120-km (75-mi) power umbilicals for a subsea multiphase compression system at Norske Shell’s Ormen Lange gas field in the Norwegian Sea.
Currently the field produces around 70 MMcm/d via subsea facilities, with the gas sent through a pipeline to the Nyhamna processing plant on the Norwegian west coast.
It is then purified and transported to the UK through a 1,200-km (745-mi) pipeline across the North Sea. Subsea compression should extend the life of the field.
OneSubsea and Subsea Integration Alliance partner Subsea 7 are supplying and installing two 16-MW subsea compression stations tied into existing manifolds and pipelines at a water depth of 850 m (2,789 ft).
The equipment will be powered and controlled from Nyhamna, 120 km from the subsea location.
Nexans will provide the power umbilicals that will integrate all the 52-kV electrical power, hydraulic and fiber optic elements needed to power and control the compressor station.
The company will perform manufacture in Halden, Norway, with the new cable laying vessel Aurora installing the umbilicals in 2023.