Subsea compression system for well stream boosting

Abstract

A subsea compression station is provided. The subsea compression station comprises a separator, a compressor configured to compress and discharge gas separated from a well stream ingested into the separator, a pump configured to pump liquid separated from the well stream, and an electrical motor drivingly connected to a compressor rotor comprising a compressor rotor shaft connectable to a pump rotor through a speed reduction device, wherein the speed reduction device is configured to bring the pump rotor in co-rotation with the compressor rotor at a reduced speed.

1 . A subsea compression station comprising:
 a separator;
 a compressor configured to compress and discharge gas separated from a well stream ingested into the separator; 
 a pump configured to pump liquid separated from the well stream; and 
 an electrical motor drivingly connected to a compressor rotor comprising a compressor rotor shaft connectable to a pump rotor through a speed reduction device, wherein the speed reduction device is configured to bring the pump rotor in co-rotation with the compressor rotor at a reduced speed. 
   
     
     
         2 . The compression station of  claim 1 , wherein the speed reduction device comprises a variable speed hydrodynamic torque converter. 
     
     
         3 . The compression station of  claim 2 , wherein the compressor rotor shaft is fixedly connected to a housing of a fill-controlled hydrodynamic torque converter, and the pump rotor is fixedly connected to a turbine of the fill-controlled torque converter. 
     
     
         4 . The compression station of  claim 2 , wherein the compressor rotor shaft is fixedly connected to an impeller of a variable vane hydrodynamic torque converter and the pump rotor is fixedly connected to a turbine of the variable vane torque converter. 
     
     
         5 . The compression station of  claim 1 , wherein the speed reduction device is an electrical hysteresis powered clutch. 
     
     
         6 . The compression station of  claim 5 , wherein the compressor rotor shaft is fixedly connected to a rotor of the electrical hysteresis powered clutch and the pump rotor is fixedly connected to a hysteresis disk of the electrical hysteresis powered clutch. 
     
     
         7 . The compression station of  claim 1 , wherein the speed reduction device has a speed reduction ratio of about 4-5:1. 
     
     
         8 . The compression station of  claim 1 , wherein the compressor comprises a centrifugal wet gas compressor and the pump comprises a positive displacement liquid pump, wherein the centrifugal wet gas compressor and the positive displacement liquid pump are commonly driven and independently controlled.