Subsurface control valve

Details Subsurface control valve Subsurface control valve

E - Fixed Constructions

21

B

166/41

E21B 34/12 (2006.01) E21B 34/14 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1271133

Abstract A full opening subsurface control valve for use in sub- surface closure of a well annulus. The valve includes a body with a sleeve reciprocably disposed in the valve body. The body is releasably attached to an upper tool string por- tion, and the sleeve is attached to a lower tool string por- tion. An actuator arm, mounted on the body and stationary with respect thereto, engages a ball valve element. When the body and sleeve are in a relatively converged position, the ball valve element is in a closed position. When the body and sleeve are in a relatively extended position, the ball valve is in an open position, such that the ball valve element, body and sleeve define a substantially unobstructed flow passage through the valve. A spring is utilized for relatively biasing the body and sleeve toward the converged position. The weight of the lower tool string portion over- comes the spring force such that the valve is maintained in an open position as it is longitudinally positioned in the well bore. A pressure balancing piston is provided for balancing forces exerted by test pressurization of the valve so that undesired opening of the valve is prevented.

525340

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