Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1996-07-17
1999-12-21
Lee, Kevin
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
166 664, 166319, E21B 404
Patent
active
060038349
ABSTRACT:
A fluid circulation apparatus for interconnection with a wellbore tubing string for particular use in drilling deviated wellbores, such as with coiled tubing. The circulation apparatus has a tubular body member with a longitudinal bore extending eccentrically therethrough and threads for interconnection with a tubing string. A fluid communication port extends through a sidewall of the tubular body member, and a shiftable sleeve is placed thereacross for selectively permitting and preventing fluid flow through the fluid communication port. The valve is biased in a normally closed position by way of a spring and/or hydraulic fluid. Fluid control means, such as a hydraulic fluid source conveyed from a downhole Hydraulic Power Unit to an internal piston, opens or closes the valve in response to electrical signals sent to the Hydraulic Power Unit from the earth's surface.
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Brown Scott H.
Camco International Inc.
Lee Kevin
LandOfFree
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