Method and apparatus of locking closed a subsurface safety syste

Details Method and apparatus of locking closed a subsurface safety syste Method and apparatus of locking closed a subsurface safety syste

1991-08-01

1992-11-24

Novosad, Stephen J.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

1661175, 166332, 166385, E21B 3410, E21B 3414, E21B 4312

Patent

active

051654806

ABSTRACT:
Locking closed a subsurface safety system in a well production tubing from the well surface by releasably holding the subsurface safety valve in the open position. Thereafter closing the subsurface safety system from the well surface through a control line extending exteriorly of the production tubing. Thereafter preventing the safety system from being opened through the control line.

REFERENCES:
patent: 3741299 (1973-06-01), Terral
patent: 3786867 (1974-01-01), Tausch et al.
patent: 4161219 (1979-07-01), Pringle
patent: 4469179 (1984-09-01), Crow et al.
patent: 4566534 (1986-01-01), Going, III
patent: 4649993 (1987-03-01), Going, III
patent: 4802147 (1988-04-01), Wolff et al.

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