US 12,146,485 B2
System for subsea pressure booster power supply and distribution, method for operation and use thereof
Tommy Westberg, Torsby (SE); and Torbjørn Strømsvik, Nesbru (NO)
Assigned to FSubsea AS, Oslo (NO)
Appl. No. 17/620,048
Filed by FSubsea AS, Oslo (NO)
PCT Filed Jun. 25, 2020, PCT No. PCT/NO2020/050181
§ 371(c)(1), (2) Date Dec. 16, 2021,
PCT Pub. No. WO2020/263105, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 20190801 (NO), filed on Jun. 26, 2019.
Prior Publication US 2022/0307489 A1, Sep. 29, 2022
Int. Cl. E21B 43/01 (2006.01); F04B 17/03 (2006.01); F04B 47/08 (2006.01); F04B 49/02 (2006.01); F04B 49/06 (2006.01); H02G 9/12 (2006.01)
CPC F04B 49/06 (2013.01) [E21B 43/01 (2013.01); F04B 17/03 (2013.01); F04B 47/08 (2013.01); F04B 49/02 (2013.01); H02G 9/12 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A system for subsea pressure booster power supply and distribution, wherein the system essentially consists of:
a supply cable;
at least one subsea pressure booster comprising a motor driving a pump or compressor;
one subsea direct online switch (SDOS) for the at least one subsea pressure booster, wherein the SDOS comprises a linear, a rotary or a combined linear-rotary actuator coupled to a control link for opening or closing the SDOS, for stop or start of the at least one subsea pressure booster, independently from a power supply control system;
wherein the supply cable at a source end is coupled to an AC power source at a topside, onshore or subsea location;
wherein the supply cable at a pressure booster end is coupled directly or via a distribution device to the SDOS;
wherein the SDOS is coupled to the motor of the at least one subsea pressure booster;
wherein the supply cable, between the AC power source and the motor of the at least one subsea pressure booster, is without a connected variable speed drive (VSD) and without a variable frequency drive (VFD); and
wherein the distribution device is a subsea transformer comprising one primary winding coupled to the supply cable and one secondary winding for the at least one subsea pressure booster, coupled to a liquid filled subsea direct online switch (SDOS) with a pressure compensator, coupled to the at least one subsea pressure booster, with the subsea transformer arranged in a liquid filled and pressure compensated housing and the SDOS arranged in a separate housing, with remotely wet mate able connectors in between the housings.