Flow actuated safety valve

Details Flow actuated safety valve Flow actuated safety valve

E - Fixed Constructions

21

B

E21B 34/08 (2006.01) E21B 34/06 (2006.01) F16K 17/00 (2006.01)

Patent

CA 2068180

FLOW ACTUATED SAFETY VALVE ABSTRACT A retrievable subsurface safety valve positioned in a well conduit is actuated to close by a predetermined flow rate through the safety valve. A valve member (16) having a sealing surface (16b) is movable by flow to sealingly engage an annular seat (12) in the valve, closing the valve to flow. All the forms of safety valve described have retrievable variable weight assemblies (23) which releasably lock in the valve member for varying the flow rate at which each valve closes. In two forms of the invention, the weight assemblies (25 or 38) when retrieved from the valve members leave the valve members open for passage of well tools through the valve members. In one form, the valve housing (42) has variable biasing means (54,55) for biasing the valve member (53) toward open position and this safety valve may be operated to expend the seat, housing and valve member with or without the variable weight assembly. (Fig. 1)

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