Surface controlled sub-surface safety valve

Details Surface controlled sub-surface safety valve Surface controlled sub-surface safety valve

1977-05-18

1978-10-10

Leppink, James A.

Wells

With below and above ground modification

Above ground actuating means for below ground device

137111, 166321, 251 28, E21B 4312

Patent

active

041191463

ABSTRACT:
A surface controlled subsurface safety valve having an operator and a pilot valve. The pilot valve controllably communicates pressurized control fluid to affect the operator and pressure balances the operator. 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: 2594831 (1952-04-01), Walton
patent: 2599713 (1952-06-01), Kagay et al.
patent: 2751182 (1956-06-01), Snyder
patent: 2751923 (1956-06-01), Towler et al.
patent: 3292706 (1966-12-01), Grimmer et al.
patent: 3627042 (1971-12-01), McGowen, Jr.
patent: 3860066 (1975-01-01), Pearce et al.
patent: 4005751 (1977-02-01), Page, Jr.

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