Retrievable well safety valve with expandable external seals

Details Retrievable well safety valve with expandable external seals Retrievable well safety valve with expandable external seals

1986-05-29

1987-09-08

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166322, 166332, E21B 3410

Patent

active

046917764

ABSTRACT:
A retrievable subsurface well safety valve for installation in and controlling fluid through a well conduit having a polished bore. Two upper seals are provided on the exterior of the valve for isolating the control fluid for actuating a piston and cylinder assembly. A lower seal is provided adjacent the valve closure member for blocking fluid flow through the valve housing. The seals initially have a smaller outside diameter than the internal diameter of the polished bore and the outside diameter of the valve housing for preventing damage to the seals while running in the well conduit. The seals are expanded into engagement with the polished bore either mechanically or hydraulically.

REFERENCES:
patent: 3799204 (1974-03-01), Watkins et al.
patent: 3874634 (1975-04-01), Gazda et al.
patent: 4538685 (1985-09-01), Pringle et al.
patent: 4585067 (1986-04-01), Blizzard et al.
patent: 4601341 (1986-07-01), Pringle et al.

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