Vigdis Booster station project was sanctioned in November 2018. It is the first project in Equinor’ s project portfolio which has implemented the standardization principles for subsea booster stations. Equinor has since 2015 been defining and developing a standardized subsea multiphase boosting pump station with specified interfaces. The station will comprise of a foundation structure with trawl protection, a manifold module for connection to flow lines, a boosting pump module and an umbilical termination assembly. Key principles are a standardized manifold design with 2 off horizontal connections to the flow lines and 2 off vertical hubs (vertical bore) for connection of the pump module. The solution has been designed and engineered as a collaboration with SubseaDesign.

Production on the Vigdis Field is currently limited by the capacity in the production lines and pressure drop across the topside chokes. Reservoir deliverability is limited by low reservoir pressure in some parts of the field, together with increasing water cut, leading to reduced energy into the system i.e. dropping wellhead pressures. OneSubsea will deliver both the pump system, including all-electric control, and the pump station. VBS will apply a 8.7 KV HV motor and thereby eliminate the need for subsea transformer and reducing investment cost benchmarked to similar subsea projects. The subsea pump interphase document described in the presentation is released as an open document allowing all companies, both operators and suppliers, to implement the proposals in their future field development where subsea booster pumps are part of the concept.