US 12,247,463 B2
Subsea fluid injection system
Helge Dale, Sandsli (NO); and Anders Brunvold, Sandsli (NO)
Assigned to ONESUBSEA IP UK LIMITED, London (GB)
Appl. No. 18/261,634
Filed by OneSubsea IP UK Limited, London (GB)
PCT Filed Jan. 17, 2022, PCT No. PCT/US2022/012667
§ 371(c)(1), (2) Date Jul. 14, 2023,
PCT Pub. No. WO2022/155568, PCT Pub. Date Jul. 21, 2022.
Claims priority of provisional application 63/139,379, filed on Jan. 20, 2021.
Claims priority of provisional application 63/137,782, filed on Jan. 15, 2021.
Prior Publication US 2024/0309736 A1, Sep. 19, 2024
Int. Cl. E21B 43/017 (2006.01); E21B 43/20 (2006.01); E21B 43/36 (2006.01)
CPC E21B 43/017 (2013.01) [E21B 43/20 (2013.01); E21B 43/36 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A subsea injection system comprising:
a plurality of filter stages configured to filter seawater and output filtered seawater and waste seawater, wherein the waste seawater comprises particles removed from the filtered seawater;
a combined pump fluidly coupled to the plurality of filter stages, the combined pump comprising:
an injection pump comprising an injection pump inlet, wherein the injection pump is configured to receive the filtered seawater at the injection pump inlet and pump the filtered seawater into a reservoir of a geological formation;
a filter pump comprising a filter pump inlet, wherein the filter pump is configured to receive the waste seawater at the filter pump inlet and expel the waste seawater; and
a motor configured to drive the injection pump and the filter pump, wherein the motor is configured to drive the filter pump via an indirect coupling, and wherein the motor is sealed from the filter pump at the indirect coupling; and
a backwash flow line fluidly coupling a first filter stage of the plurality of filter stages to the filter pump inlet, wherein the backwash flow line bypasses a second filter stage of the plurality of filter stages.