Safety system

Details Safety system Safety system

E - Fixed Constructions

21

B

166/41

E21B 34/10 (2006.01)

Patent

CA 1196856

Abstract of the Disclosure A well controlled by two hydraulically operated subsurface safety valves made up in the tubing string. A first valve is mechanically locked in open position and the second valve is utilized to control flow through the string. Upon malfunction of the second valve it is locked in open position and the first valve is released from its locked open position and is utilized to control flow through the string.

417847

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