Retrievable well packers

Details Retrievable well packers Retrievable well packers

1976-05-17

1977-08-30

Leppink, James A.

Wells

Packers or plugs

With expanding anchor

166182, E21B 2300

Patent

active

040448266

ABSTRACT:
A retrievable packer is lowered into a well casing on a tubular string, the packer having expanders and coengageable slips expandable outwardly by fluid pressure into anchoring engagement with the well casing to prevent packer movement in both upward and downward directions. After the slips are set, the packing assembly for the packer is expanded by fluid pressure into sealing engagement with the well casing. Differential pressure in the tubing-casing annulus above the packing assembly, operates over booster areas to increase the pack-off force of the packing elements of the packing assembly against the casing to insure against leakage, providing a self-energizing system, the pack-off force on the packing elements being trapped to prevent its subsequent dimunition. Forces applied to the tubing string, either tensile or compressive, are transmitted directly to the slips and into the casing without passing through the packing, thereby having no effect on the latter. The packer is releasable from the casing either by manipulation of the tubular string or by wireline apparatus lowered through the tubing string into the packer, the packer then being removed from the casing by the tubular string.

REFERENCES:
patent: 3054450 (1962-09-01), Baker
patent: 3361209 (1968-01-01), Edwards, Jr.
patent: 3456723 (1969-07-01), Current et al.
patent: 3678998 (1972-07-01), Cockrell et al.
patent: 3976133 (1967-08-01), Allen

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