Subterranean well safety valve with reference pressure chamber

Details Subterranean well safety valve with reference pressure chamber Subterranean well safety valve with reference pressure chamber

1982-07-06

1984-08-28

Novosad, Stephen J.

Wells

Packers or plugs

Controllable passage through packer

166332, 166321, 277135, E21B 3408

Patent

active

044678673

ABSTRACT:
A subsurface safety valve for use in subterranean oil and gas well which is actuated by pressure fluctuations in the tubing-casing annulus is disclosed. The safety valve assembly consists of a safety valve mounted in a packer which is actuated by a subsurface control located above the packer. Annulus pressure variations are controlled by a surface unit. The subsurface control utilizes a reference pressure chamber in which the pressure is initially adjustable to compensate for hydrostatic pressure in the annulus. Leakage of the gas in a dome pressure chamber in the subsurface control is impeded by the presence of a barrier fluid impervious to the passage of gas therethrough, with the barrier fluid being maintained at a higher pressure than the reference pressure in the dome charged chamber.

REFERENCES:
patent: 3827501 (1974-08-01), Johnson et al.
patent: 4252188 (1981-02-01), Fredd
patent: 4341266 (1982-07-01), Craig
patent: 4361188 (1982-11-01), Russell
patent: 4378850 (1983-04-01), Barrington

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