Subsurface well safety valve with hydraulic strainer

Details Subsurface well safety valve with hydraulic strainer Subsurface well safety valve with hydraulic strainer

1988-03-07

1988-12-20

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, 166375, E21B 3410

Patent

active

047919914

ABSTRACT:
The combination of a subsurface well safety valve which is controlled through a hydraulic fluid line extending from the well surface to the safety valve of a hydraulic strainer including a chamber positioned above the actuating hydraulic piston and cylinder assembly of the safety valve. A fluid passageway adapted to be connected to receive hydraulic control fluid from the well surface extends into the chamber and an outlet fluid passageway adapted to be connected to the hydraulic piston and cylinder assembly of the safety valve extends into the chamber. The lower end of the inlet fluid passageway is positioned between the upper end of the outlet fluid passageway for protecting the piston and cylinder assembly from debris. A filter may be provided in the chamber between the lower end of the inlet fluid passageway and the upper end of the outlet fluid passageway.

REFERENCES:
patent: 4161219 (1979-07-01), Pringle
patent: 4276931 (1981-07-01), Murray
patent: 4350205 (1982-09-01), Goldschild et al.
patent: 4574894 (1986-03-01), Jadwin
patent: 4691777 (1987-09-01), Williamson, Jr.

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