OSLO, Norway – Statoil has agreed to join Aker BP, Lundin Petroleum, and National Oilwell Varco in the DEMO2000 joint industry project, led by Fuglesangs Subsea.
The aim is to bring theOmnirise single-phase subsea booster pump to market by early 2019.
According to Fuglesangs Subsea’s CEO Alexander Fuglesang, the main problem encountered with subsea pumps to date has been the mechanical shaft seal, responsible for 70% of subsea pump failures.
Dynamic shaft seals also require a constant flow of barrier fluid, supplied by topsides hydraulic equipment and delivered through umbilical lines extending over many kilometers.
Another issue is variable-speed drives which add weight and volume topsides. Subsea versions of these drives appear to be equally as bulky, Fuglesang claimed.
The Omnirise system employs a patented Hydromag Drive Unit, described as a combination of a fixed low-speed subsea electric motor, a variable-speed torque converter, and high-performance magnetic coupling.
“The improvements deliver benefits throughout the system,” Fuglesang said, “from eliminating the weakest link and reducing topside and subsea equipment, to enabling cost-effective, standardized and highly modular boosting units.”
Rystad Energy has estimated that Omnirise could provide capex savings of NOK150 million ($18.5 million) on a single-well boosting installation, compared to conventional boosting systems.
Other benefits claimed for Omnirise are elimination of the risk of barrier fluid leakage eliminated, and reduced opex, with less topsides equipment to maintain.
Also, when combined with the proven Seabox water filtration system, Omnirise can be installed as a fully subsea solution.