Subsurface safety valve

Details Subsurface safety valve Subsurface safety valve

E - Fixed Constructions

21

B

E21B 34/12 (2006.01) E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2160817

A subsurface safety valve 10 has a tubular valve housing 12, a valve closure member 18 movable between an open position and a closed position, an axially shiftable flow tube 24 for opening the valve closure member 18, a spring 38 for biasing the flow tube 24 to a closed position, a piston and cylinder assembly 26 to move the flow tube 24 to an open position, and a plug inserted within an opening in the valve housing 12. This opening is in fluid communication with the piston and cylinder assembly 26. The plug is adapted to be displaced from the opening to lock out the safety valve, and to establish secondary hydraulic fluid communication with an interior of the safety valve in order to operate secondary tools, such as wireline set secondary valves, inserted into the locked out safety valve. This provides a low cost and relatively uncomplicated lockout mechanism.

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