Tandem solenoid-controlled safety cut-off valve for a fluid well

Details Tandem solenoid-controlled safety cut-off valve for a fluid well Tandem solenoid-controlled safety cut-off valve for a fluid well

1978-01-03

1980-03-04

Novosad, Stephen J.

Wells

With electrical means

166332, 251137, 335267, 335253, E21B 4312, F16K 3108, H01F 716

Patent

active

041912489

ABSTRACT:
A tandem solenoid fail-safe sub-surface safety cut-off valve for fluid wells controllable from the surface and suitable for installation at substantially greater depths than prior constructions. The valve assembly may be installable and retrievable either via wire line or tubing techniques and utilizes tandem electromagnetic means to operate either a flapper or a ball cut-off valve. The solenoid coils embrace a landing nipple portion of the tubing string or the tubing string itself and hold either type of cut-off valve open against spring pressure only so long as the coils are energized thereby providing surface control of the safety cut-off valve normally and assurance of closing of this valve by energy stored in spring means in the event of power failure through accident or some catastrophe as well as automatic closure if flow velocity increases beyond a predetermined safe value. The tandem solenoids provide abundant operating energy while utilizing a minimum of radial space between the casing and the tubing string.

REFERENCES:
patent: 2901210 (1959-08-01), Hebard
patent: 3032111 (1962-05-01), Corley, Jr. et al.
patent: 3275964 (1966-09-01), Kumm
patent: 3389355 (1968-06-01), Schroeder, Jr.
patent: 3430120 (1969-02-01), Kotaka et al.
patent: 3447776 (1969-06-01), Blumer
patent: 3621422 (1971-11-01), Macy
patent: 3861464 (1975-01-01), Boyadjieff et al.
patent: 3910352 (1975-10-01), Mott

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