Redundant safety valve system and method

Details Redundant safety valve system and method Redundant safety valve system and method

1985-04-01

1986-08-12

Novosad, Stephen J.

Wells

Processes

Assembling well part

166386, 166322, 166323, 166332, E21B 1916, E21B 3410, E21B 3414

Patent

active

046050701

ABSTRACT:
A first well tubing with a tubing retrievable safety valve having a bore of substantially the same size as the bore of the first well tubing. A second well tubing is connected to the first well tubing above the first well tubing and extends to the well surface and the second well tubing has a bore larger than the bore of the first well tubing. A landing nipple in the second well tubing has substantially the same size bore as the bore of the second well tubing. A wireline retrievable safety valve positioned in the interior of the landing nipple has a bore only slightly smaller than the bore of the first well tubing and thereby does not unduly restrict the flow of fluid through the well tubing.

REFERENCES:
patent: 3696868 (1972-10-01), Taylor, Jr.
patent: 3799258 (1974-03-01), Tausch
patent: 4009753 (1977-03-01), McGill et al.
patent: 4161219 (1979-07-01), Pringle
patent: 4291722 (1981-09-01), Churchman
patent: 4460046 (1984-07-01), Pringle
patent: 4534414 (1985-08-01), Pringle

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