Subsurface tubing safety valve

Details Subsurface tubing safety valve Subsurface tubing safety valve

1991-10-25

1993-01-05

Neuder, William P.

Wells

Valves, closures or changeable restrictors

Fluid operated

166324, 166332, E21B 3408

Patent

active

051762200

ABSTRACT:
There is disclosed a subsurface tubing safety valve comprising a body having ports therein connecting the bore of the body with the annulus thereabout, a sleeve for reciprocating in the body between positions opening and closing the ports, and a piston which reciprocates within the sleeve, and a pair of coil springs, a first of which acts between the piston and sleeve and a second of which acts between the sleeve and body. When the sleeve is raised to its open position, the piston may be caused to move upwardly within the sleeve in response to a predetermined increase in pressure differential acting upwardly across the piston so as to compress and generate energy in both springs. As the piston moves up, the sleeve is connected to it for downward movement therewith in response to a predetermined decrease in the pressure differential across the piston to a position in which the sleeve is released by an expandable end of a bellows in response to a predetermined drop in the pressure of the well fluid.

REFERENCES:
patent: 4331315 (1982-05-01), Geisow
patent: 4340088 (1982-07-01), Geisow
patent: 4349043 (1982-09-01), Christensen
patent: 4768594 (1988-09-01), Akkerman

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