Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1996-02-08
1998-05-19
Neuder, William P.
Wells
Valves, closures or changeable restrictors
Fluid operated
1663327, E21B 3412
Patent
active
057525692
ABSTRACT:
An equalizing subsurface safety valve for controlling fluid flow in a well conduit comprises a tubular body member having a longitudinal bore extending therethrough, a flapper hingably connected within the tubular body member to alternately permit and prevent fluid flow through the longitudinal bore, means for biasing the flapper to a normally closed position to prevent fluid flow through the longitudinal bore, a flow tube longitudinally movable within the longitudinal bore for controllably opening the flapper, fluid passage formed within the tubular body for providing fluid communication between the longitudinal bore adjacent a first side of the flapper and a second side of the flapper, and a closure member mounted across the fluid passage adjacent the first side of the flapper and movable along an axis generally transverse to the longitudinal bore. A side wall of the flow tube includes a first notch so that the closure member is maintained in a closed position when the flow tube is in a retracted position and the closure member is moved to an open position when the flow tube is moved to open the flapper. A second notch can be included in the flow tube so that the closure member will return to a closed position when the flow tube is extended to a position where the flapper is opened.
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Bhavsar Rashmi B.
Hill, Jr. Thomas G.
Schroeder Alan G.
Camco International Inc.
Neuder William P.
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