Subsurface tubing safety valve

Details Subsurface tubing safety valve Subsurface tubing safety valve

1994-05-27

1995-11-14

Dang, Hoang C.

Wells

With electrical means

Electrical motor

166 665, 166323, E21B 3406

Patent

active

054657865

ABSTRACT:
There is disclosed a subsurface safety valve which is adapted to be installed in a tubing string within a well bore and of a type which remains open only so long as a controlled condition is maintained. Also disclosed are several embodiments of a mechanism for holding a rotary control rod of such a valve or other apparatus in a desired rotational position to maintain it open, or otherwise in a desired state, and then releasing it, upon loss of the controlled condition, for return to its original rotational position.

REFERENCES:
patent: 4062406 (1977-12-01), Akkerman et al.
patent: 4664195 (1987-05-01), Deaton
patent: 4768594 (1988-09-01), Akkerman
patent: 4852648 (1989-08-01), Akkerman et al.
patent: 4953616 (1990-09-01), Borden et al.
patent: 5070944 (1991-12-01), Hopper
patent: 5176164 (1993-01-01), Boyle
patent: 5176284 (1992-12-01), Leismer
patent: 5343955 (1994-09-01), Williams
patent: 5358035 (1994-10-01), Grudzinski

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