Method of using a subsurface safety valve

Details Method of using a subsurface safety valve Method of using a subsurface safety valve

1974-11-04

1976-02-24

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

166315, E21B 4312, E21B 4301

Patent

active

039399133

ABSTRACT:
A pressure operated safety valve adapted to be mounted in a well tubing, which may be moved to open or closed positions independently of pressure in the tubing and locked in and unlocked from the open position using control fluid pressure.

REFERENCES:
patent: 3675720 (1972-07-01), Sizer
patent: 3696868 (1972-10-01), Taylor

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