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US 6,550,743 B2Granted
Hydraulic system for actuation of a measurement-while-drilling mud valve
OwnerStephen P. Rountree, Bradley J. Vincentinventors
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OwnerStephen P. Rountree, Bradley J. Vincentinventors
Estimating the term…
The hydraulic system for actuation of the mud valve of a measurement-while-drilling tool is characterized by a hydraulic actuator having a piston operatively connected to the mud valve of a measurement-while-drilling tool, which hydraulic actuator incorporates an internal by-pass which, cooperatively with movement of the piston, opens to unload hydraulic pressure from the system at either end of stroke of the piston. Return from the by-pass to the pump may be restricted so as to maintain some hydraulic pressure on the piston at end of stroke so as to prevent movement therefrom by external forces. The hydraulic system may include a high pressure relief valve, hydraulic fluid strainer and a device to equalize pressure between hydraulic system pressure and pressure external of the system.
A hydraulic system for actuation of a mud valve of a measurement-while-drilling tool, comprising a hydraulic pump, a hydraulic actuator having a stroke and operatively coupled to the mud valve of a measurement-while-drilling tool, a valve for selectively directing hydraulic fluid from said pump to said hydraulic actuator;
A hydraulic system for actuation of a mud valve of a measurement-while-drilling tool, comprising:
A hydraulic system for actuation of a mud valve of a measurement-while-drilling tool, comprising:
Dependencies are inferred from the claim text.