Valving apparatus for selectively sealing an annulus defined bet

Details Valving apparatus for selectively sealing an annulus defined bet Valving apparatus for selectively sealing an annulus defined bet

1981-06-25

1983-12-13

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166321, 166334, E21B 3410

Patent

active

044200439

ABSTRACT:
The disclosure provides a valve for an annulus defined between a tubular work string or other conduit and a surrounding annular portion of an operative element disposed on production string, such as a safety valve. The annulus valve comprises an annular valve body, which may comprise an elastomeric mass, which is urged by resilient means into sealing engagement with the exterior of the tubular work string and is shiftable out of such sealing engagement, such as by an annular piston which is responsive to control fluid pressure. The same control fluid pressure may be utilized to operate the safety valve to its open position.

REFERENCES:
patent: 3338310 (1967-08-01), McGill
patent: 3367422 (1968-02-01), Sims
patent: 4270610 (1981-06-01), Barrington

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