Method and apparatus for sealing a casing in a subterranean well

Details Method and apparatus for sealing a casing in a subterranean well Method and apparatus for sealing a casing in a subterranean well

1989-04-28

1990-07-17

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166187, 166323, 166374, E21B 3313, E21B 3410

Patent

active

049415344

ABSTRACT:
An inflatable packer is mounted on the bottom end of a well casing by valve housing defining an annular chamber which is in communication at its lower end with the inflatable packer. A radial port is provided in the inner wall of the annular chamber for communicating with the bore of the casing and, during run-in, such radial port is closed by a sleeve valve shearably secured in the annular chamber. Application of pressured inflation fluid to the sleeve valve causes it to shift to a position permitting inflation fluid to flow through the annular chamber to the inflatable packer. Intermediate the first sleeve valve and the inflatable packer is a second sleeve valve which is shearably secured in a normally open position with respect to fluid flow through the annular chamber. When the pressure of the inflation fluid increases when the inflatable packer is filled with inflation fluid, such increased fluid pressure exerts an axial force on the second sleeve valve causing it to shift to interrupt communication between the annular chamber and the inflatable packer. A subsequent reduction in fluid pressure permits a third spring biased sleeve valve to move in the annular chamber to a closing position relative to the radial port.

REFERENCES:
patent: 3853177 (1974-12-01), Mott
patent: 4602684 (1986-07-01), Van Wormer et al.

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