Flapper-type subsurface safety valve

Details Flapper-type subsurface safety valve Flapper-type subsurface safety valve

1975-05-29

1976-05-25

Leppink, James A.

Wells

Means for guiding insertable element laterally of well axis

166224A, 251228, 251243, E21B 706, E21B 4312

Patent

active

039586332

ABSTRACT:
This is a subsurface safety valve for insertion in a tubing string in a well drilled in the earth, normally for the production of oil and gas. This valve is lowered and retrieved by wireline and is seated in a special side-pocket mandrel which is a part of the tubing string. One suitable valve is a flapper-type, full-opening valve having a folding or collapsing flapper that permits it to retract completely into the side pocket, thereby leaving a full opening through the valve and tubing string when open. The valve may be controlled either by hydraulic pressure transmitted to it from the surface or by subsurface pressure sensing means.

REFERENCES:
patent: 2780290 (1957-02-01), Natho
patent: 2786535 (1957-03-01), Boer et al.
patent: 2798561 (1957-07-01), True
patent: 3375846 (1968-04-01), Canalizo
patent: 3665955 (1972-05-01), Conner

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