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US 2015/0027782 A1Published application
Mud hydraulic top drive
AssigneeNational Oilwell Varco, L.P.
InventorsJames William WEIR, Dean A. Bennett
Life of this patent
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Abstract
A top drive includes a hydraulic motor in fluid communication with first inlet for a supply of pressurized drilling fluid. A drill string adapter is mechanically coupled to the hydraulic motor and is in fluid communication with the first inlet.
Claims20
A top drive comprising;
- a first inlet for a supply of pressurized drilling fluid;
- a hydraulic motor in fluid communication with the first inlet;
- and
- a drill string adapter mechanically coupled to the hydraulic motor, wherein the drill string adapter is in fluid communication with the first inlet.
1 more element
A drilling system comprising:
- a mud pump;
- a top drive system hydraulically coupled to the mud pump, wherein the top drive system includes a hydraulic motor that is hydraulically coupled to the mud pump;
- and
- a drill string coupled to the top drive system, wherein the drill string is mechanically coupled to the hydraulic motor and hydraulically coupled to the mud pump.
1 more element
A method of operating a top drive system comprising:
- operating a mud pump to provide a pressurized drilling fluid;
- supplying the pressurized drilling fluid to a top drive system;
- passing at least a portion of the pressurized drilling fluid through a hydraulic motor that is mechanically coupled to a drill string;
- and
- passing the pressurized drilling fluid to the drill string.
2 more elements
Dependencies are inferred from the claim text.