US 9,810,033 B1
Subsea drilling systems and methods
Rod William Shampine, Houston, TX (US); and David Milton Eslinger, Collinsville, OK (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed on Sep. 2, 2016, as Appl. No. 15/256,251.
Int. Cl. E21B 4/02 (2006.01); E21B 7/124 (2006.01); E21B 17/20 (2006.01); E21B 21/00 (2006.01); E21B 19/22 (2006.01); E21B 21/06 (2006.01); E21B 21/08 (2006.01)
CPC E21B 21/001 (2013.01) [E21B 4/02 (2013.01); E21B 7/124 (2013.01); E21B 17/20 (2013.01); E21B 19/22 (2013.01); E21B 21/065 (2013.01); E21B 21/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a drilling system located on a seabed and operable to drill a wellbore through a rock formation below the seabed, wherein the drilling system comprises:
a drill operable to drill the wellbore;
piping operable to convey the drill and communicate drilling fluid to the drill during drilling operations;
a pump operable to pump seawater; and
a pressure exchanger fluidly connected with the pump and the piping, wherein the pressure exchanger is operable to:
receive the drilling fluid at a first pressure;
receive the seawater from the pump at a second pressure to pressurize the drilling fluid to a third pressure, wherein the second and third pressures are substantially greater than the first pressure;
discharge the drilling fluid into the piping; and
discharge the seawater into a subsea environment; and
wherein the pressure exchanger comprises:
a housing having a bore extending between first and second ends of the housing;
a rotor rotatably disposed within the bore and comprising at least one chamber extending through the rotor between the first and second ends of the housing;
a first cap covering the bore at the first end of the housing, wherein the first cap comprises a drilling fluid inlet and a drilling fluid outlet; and
a second cap covering the bore at the second end of the housing, wherein the second cap comprises a seawater inlet and a seawater outlet.