Method for driving a hydraulic submerged tool
AssigneeIHC Holland N.V.
InventorDik Arentsen
Life of this patent
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Abstract
Method for driving a hydraulic submerged tool whereby the hydraulic pressure energy is generated in a submerged power converter, being driven by pressurized surrounding water which after the energy transfer is exhausted into the surrounding water, said power converter consisting of one or more work cylinders (1, 2), each by means of a floating piston (3, 4) being divided in a space (5, 6) filled with the pressurized surrounding water and a space (7, 8), filled with a hydraulic work medium, switching means (17, 18) being provided, for alternately connecting said space (5, 6) either to a feed conduct (13) for pressurized surrounding water, or to an exhaust (14).
Claims11
A method for driving a hydraulic tool submerged in surrounding water comprising:
- providing one or more work cylinders, each of said cylinders being divided by a floating piston into a first and second space;
- filling said first space with pressurized surrounding water;
- filling said second space with a hydraulic work medium;
- reciprocating said floating piston in said work cylinder;
- alternately connecting said first space to one of a feed conduct for pressurized water and a free exhaust each time said floating piston reaches the end of its work stroke;
- operatively connecting said second space to the tool through a pressure conduct;
- and
- driving the tool with said hydraulic work medium.
A power converter for driving a tool submerged in surrounding water comprising:
- one or more work cylinders, each of said work cylinders being divided by a floating piston into a first space filled with pressurised surrounding water and a second space filled with a hydraulic work medium;
- switching means operatively connected with said work cylinders, which are activated each time that the floating piston reaches the end of its work stroke, so that at each work cylinder the first space is alternately connected to one of a feed conduct for pressurized surrounding water or a free exhaust;
- and
- a pressure conduct connected to each work cylinder at the side of the hydraulic work medium, said pressure conduct being connected via one way valves.
A drilling ship comprising:
- a power converter for driving a tool submerged in surrounding water, said power converter comprising:
- (a) one or more work cylinders, each of said work cylinders being divided by a floating piston into a first space filled with pressurised surrounding water and a second space filled with a hydraulic work medium;
- (b) switching means operatively connected with said work cylinders, which are activated each time that the floating piston reaches the end of its work stroke, so that at each work cylinder the first space is alternately connected to one of a feed conduct for pressurised surrounding water or a free exhaust;
- and
- (c) a pressure conduct connected to each work cylinder at the side of the hydraulic work medium, said pressure conduct being connected via one way valves;
- high pressure pumps for pressurising the surrounding water;
- and
- a drilling pipe for transporting the pressurised water to the power converter.
Dependencies are inferred from the claim text.