Subsurface annulus safety valve

Details Subsurface annulus safety valve Subsurface annulus safety valve

E - Fixed Constructions

21

B

166/46

E21B 23/00 (2006.01) E21B 33/06 (2006.01) E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1047397

A SUBSURFACE ANNULUS SAFETY VALVE Abstract of the Disclosure Disclosed is a safety system to control flow within a well which includes an annulus safety valve to control flow in the annulus between concentric well pipe and which may include a tubing safety valve to control flow in the inner pipe.

273731

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