Slip retention mechanism for subterranean well packer

Wells – Packers or plugs – With expanding anchor

Patent

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Details

166136, 166211, 285145, E21B 33129

Patent

active

049210459

ABSTRACT:
A slip retention mechanism for a packer or hanger for a subterranean well comprises a slip retention sleeve disposed in surrounding relationship to a tubular body on which cone elements are mounted for axial movement. Segment-shaped slips are mounted in the space intermediate the retention sleeve and the tubular body and have inner surfaces cooperable with the cone elements to effect a radially outward displacement of the slip elements upon relative axial movement of the cone elements. The slip retention sleeve is provided with a plurality of peripherally spaced windows separated by axially extending bars. Each slip segment is provided with an axially extending slot in its outer surface which is aligned with one of the window bars. A leaf spring is mounted intermediate the window bar and the axial slot to exert a radially inwardly directed force on the respective slip segment to hold it in a retracted position. A pair of lateral and radially extending spring projections are formed on the leaf spring to cooperate with lateral slots provided on the exterior of the slip segment to secure the slip segment and spring in their operative positions.

REFERENCES:
patent: Re31933 (1985-07-01), Taylor et al.
patent: 3456723 (1969-07-01), Current et al.
patent: 4436150 (1984-03-01), Baiker
patent: 4479538 (1984-10-01), Coyle, Sr.
patent: 4548625 (1985-10-01), Luke

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