Patent ID: 6508309
Filing Date: 2003-01-21
Classification: E21B

Abstract:
A valve assembly for location in a borehole of a well, the assembly comprising:a hollow elongate member for location in the borehole; a valve comprising a valve member and a fluid actuated valve control mechanism adapted to be selectively actuated to move the valve member between an open configuration allowing fluid flow through the hollow member and a closed configuration where the valve member is restrained by the valve control mechanism to prevent fluid flow through the hollow member in both a first axial direction and a second, opposite axial direction; a first hydraulic control conduit in fluid communication with the valve control mechanism for permitting actuation of the control mechanism to move the valve member to the open configuration, by application of a first control fluid; and a second hydraulic control conduit in fluid communication with the valve control mechanism to move the valve member to the closed configuration, by application of a second control fluid.