Safety system

Details Safety system Safety system

1981-12-17

1984-09-04

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166375, 166323, E21B 3410

Patent

active

044691793

ABSTRACT:
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.

REFERENCES:
patent: 3744564 (1973-07-01), Mott
patent: 3799258 (1974-03-01), Tausch
patent: 3865141 (1975-02-01), Young
patent: 3882935 (1975-05-01), Calhoun
patent: 3886967 (1975-06-01), Nelson
patent: 4077473 (1978-03-01), Watkins
patent: 4249599 (1981-02-01), Krause

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