Subsurface well safety valve

Details Subsurface well safety valve Subsurface well safety valve

1985-03-13

1986-02-11

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

166323, 166324, 166325, 166332, 251 62, 251 634, E21B 3410

Patent

active

045693986

ABSTRACT:
A safety valve having a flow tube telescopically movable in the housing for controlling the opening and closing of the valve in which the housing has a fluid chamber with a piston connected to the flow tube and a fluid passageway connected to the chamber adapted to be in communication with the fluid pressure at the well surface. A valve element and valve seat in the passageway seals off fluid flow through the seat and holds the flow tube in the open position when pressure is applied to the fluid passageway. Spaced minimum leak seals may be provided to form the fluid chamber. An antiburst communication line may be provided between the chamber and the bore of the safety valve having a check valve for equalizing pressure in the chamber. A valve mechanism operable by the flow tube shuts off the flow of fluid in the passageway to the fluid chamber when the valve closure member is in the open position.

REFERENCES:
patent: 3786867 (1974-01-01), Tausch et al.
patent: 3799258 (1974-03-01), Tausch
patent: 4049052 (1977-09-01), Arendt
patent: 4119146 (1978-10-01), Taylor
patent: 4173256 (1979-11-01), Kilgore
patent: 4373587 (1983-02-01), Pringle
patent: 4452310 (1984-06-01), Pringle et al.
patent: 4467870 (1984-08-01), Langham
patent: 4495998 (1985-01-01), Pringle
patent: 4527630 (1985-07-01), Pringle
patent: 4527631 (1985-07-01), Vazquez

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