Annulus safety valve

Details Annulus safety valve Annulus safety valve

1990-08-30

1991-08-20

Bui, Thuy M.

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

166321, E21B 3410

Patent

active

050406060

ABSTRACT:
A fail safe annulus valve for fluids has a valve area across the annulus with inlet and exit ports and a slide valve in the area capable of sliding to open or close the ports. The slide valve is biased to its fail safe position by a spring, is susceptible to being opened by independent pressure apparatus, and is also susceptible to movement by differential annulus fluid pressure across the valve. Thus while it fails safe, it can always be moved by differential annulus pressure. The valve may be used for the annuli of oil or gas wells (e.g. annuli used for artificial lift) and may be mounted on a packer of the annulus. It may also be used for closing other types of annuli.

REFERENCES:
patent: 4449583 (1984-05-01), Lawson
patent: 4573535 (1986-03-01), Manke
patent: 4848457 (1989-07-01), Lilley

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