Well safety system

Details Well safety system Well safety system

1979-10-29

1981-02-10

Novosad, Stephen J.

Wells

With below and above ground modification

Above ground actuating means for below ground device

166319, 166322, 166323, E21B 3410, E21B 3416, E21B 4312

Patent

active

042495997

ABSTRACT:
A subsurface well safety apparatus for controlling control fluid used to operate subsurface safety valves mounted in well production tubing. The apparatus is operated by a shifting tool between a first position enabling a pair of tandem subsurface safety valves to operate together and a second position to isolate one of the subsurface safety valves from the control fluid. The apparatus is shifted between positions by a tool movable through the production tubing to the subsurface location.

REFERENCES:
patent: 2894715 (1959-07-01), Bostock
patent: 3035808 (1962-05-01), Knox
patent: 3744564 (1973-07-01), Mott
patent: 3763932 (1973-10-01), Dinning
patent: 3786863 (1974-01-01), Tausch
patent: 3799258 (1974-03-01), Tausch
patent: 3844345 (1974-10-01), Evans et al.
patent: 3854502 (1974-12-01), Mott
patent: 3860066 (1975-01-01), Pearce et al.

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