Subsurface safety valve

Details Subsurface safety valve Subsurface safety valve

1977-05-06

1979-02-20

Nilson, Robert G.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

166324, F16K 1116, E21B 4312

Patent

active

041401530

ABSTRACT:
A surface controlled subsurface safety valve having a main valve and an equalizing valve. The equalizing valve is opened prior to the opening of the main valve. An extra control pressure force is provided to open the equalizing valve against the resistive force present due to high shut-in formation pressures. On the other hand, the safety valve can close when low subsurface pressure conditions exist at the valve. This abstract is neither intended to define the scope of the invention, which, of course, is measured by the claims, nor is it intended to be limiting in any way.

REFERENCES:
patent: 3854502 (1974-12-01), Mott

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