Retrievable safety valve

Details Retrievable safety valve Retrievable safety valve

1975-09-19

1978-01-31

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

13761411, 251 62, E21B 4312

Patent

active

040710882

ABSTRACT:
A new and improved subsurface safety valve which is inserted into well tubing without requiring removal of the tubing, and which replaces worn, deteriorated and fully or partially inoperative safety valves in the well tubing to prevent blow-outs in wells. The replacement subsurface safety valve may be subsequently removed after insertion without requiring removal of the well tubing.

REFERENCES:
patent: 2998077 (1961-08-01), Keithahn
patent: 3216501 (1965-11-01), Page, Jr.
patent: 3236255 (1966-02-01), Sizer
patent: 3292706 (1966-12-01), Grimmer et al.
patent: 3332497 (1967-07-01), Page, Jr.
patent: 3411576 (1968-11-01), Taylor, Jr.
patent: 3448803 (1969-06-01), Sizer
patent: 3494417 (1970-02-01), Fredd
patent: 3509913 (1970-05-01), Lewis
patent: 3543793 (1970-12-01), Dollison
patent: 3584645 (1971-06-01), Radig
patent: 3642070 (1972-02-01), Taylor et al.
patent: 3696868 (1972-10-01), Taylor, Jr.
patent: 3763932 (1973-10-01), Dinning
patent: 3786865 (1974-01-01), Tausch et al.

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