Retractable slip assembly

Details Retractable slip assembly Retractable slip assembly

1987-09-23

1989-03-21

Novosad, Stephen J.

Wells

Packers or plugs

With expanding anchor

166120, 166217, E21B 2300, E21B 33129

Patent

active

048134864

ABSTRACT:
A retractable slip assembly for downhole oil tools such as packers and anchors which permits retrieval of the tool with a minimum of force and without damaging the casing or tool. The slip assembly includes a plurality of slip elements adapted to engage a setting cone which moves the slips outwardly into engagement with the casing wall. The individual slip elements travel within slip windows formed in an outer sleeve. In addition to guiding the slips, the slip windows facilitate retraction of the slip elements. In order to reduce the force necessary to release the slip assemblies, the engaging edges of the slip elements and the slip windows are provided with a cooperating angle corresponding to the slope of the setting cone and slip underside. The reduced force necessary to retract the slips allows the use of upper and lower slip assemblies in conjunction with a packer assembly.

REFERENCES:
patent: 2404692 (1946-07-01), Church
patent: 2920703 (1960-01-01), Rodgers
patent: 3631927 (1972-01-01), Young

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