Subsurface annulus safety valve

Details Subsurface annulus safety valve Subsurface annulus safety valve

1976-04-05

1977-09-20

Leppink, James A.

Wells

Packers or plugs

With controllable bypass outside central conduit

166321, 166322, E21B 2300, E21B 4312

Patent

active

040490521

ABSTRACT:
Disclosed is a safety system to control flow within a well which includes an annulus safety valve to control flow in the annulus between concentric well pipe and which may include a tubing safety valve to control flow in the inner pipe.

REFERENCES:
patent: 3035642 (1957-08-01), Page
patent: 3045755 (1962-07-01), Page et al.
patent: 3156300 (1964-11-01), Page et al.
patent: 3186483 (1965-06-01), Schwab
patent: 3252476 (1963-04-01), Page, Jr.
patent: 3299955 (1967-01-01), Page, Jr.
patent: 3313350 (1967-04-01), Page, Jr.

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