Single line deep depth safety valve

Details Single line deep depth safety valve Single line deep depth safety valve

E - Fixed Constructions

21

B

166/41

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

Patent

CA 1149734

SINGLE LINE DEEP DEPTH SAFETY VALVE Abstract of the Disclosure A single control line, surface controlled subsurface safety valve for controlling flow in a well, having a valve closure member responsive to the longitudinal movement of an operator tube disposed in the bore of the safety valve. The operator tube is moved to a position opening the valve closure member by action of a piston, housed in an annular pressure zone, which is responsive to control fluid pressure from the surface of the well. The operator tube is returned to a posi- tion closing the valve closure member by action of a resilient urging means housed in an annular chamber located above the annular pressure zone. There is no pressure differential between the bore of the safety valve and the annular chamber housing the resilient urging means.

358514

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