Pump open safety valve

Details Pump open safety valve Pump open safety valve

E - Fixed Constructions

21

B

166/41

E21B 34/10 (2006.01) E21B 49/00 (2006.01) F16K 5/06 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1254130

Abstract Of The Disclosure A downhole safety valve has a ball valve element which is closed in response to an increase in well annulus pressure and which may be re-opened in response to an increase in tubing pressure.

501272

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