Tech Paper

The 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.

The Vigdis Subsea Boosting System (North Sea) is currently in execution. This will be the first multiphase boosting system with all electric control system and in addition we are also producing to and controlling the system from two different hosts. The pump is using the new HV motor, simplifying and reducing costs of the system. The boosting system 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.

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. Pressure support for the reservoirs is provided by the aquifers and by water injection.

OneSubsea's scope is to engineer, procure and construct (EPC) a Pump Station including a Manifold Foundation and Protection structure and a Pump System including topside equipment, umbilical and the pump module. The Vigdis Booster Station (VBS) will be tied into the LP and HP-lines from Vigdis B template to Snorre A (SNA) unit. In addition, the production from H template will be tied in as well as provisions for tie-in of a future prospect.

Power to the booster station will be supplied from Snorre B (SNB) via an 18 km power umbilical being hung off from a slot on the existing riser balcony at the south east corner of installation.

The solution is based on an All-Electric control system eliminating need for hydraulic lines for control.Another feature in the Vigdis subsea pump solution is to apply an 8.7 KV HV motor and thereby eliminate the need for subsea transformer and reducing investment cost benchmarked to similar subsea projects.

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