Retrievable anchor assembly

Details Retrievable anchor assembly Retrievable anchor assembly

1985-05-28

1988-06-14

Novosad, Stephen I.

Wells

Expansible anchor or casing

With wedge or cam and friction drag

166217, E21B 2300

Patent

active

047505591

ABSTRACT:
A retrievable anchor assembly for use in well bores and the like includes a unitary mandrel arranged to be directly attached to the tubing, and at its lower end to additional tubing or to well apparatus such as a well pump. An upper expander is threaded onto the mandrel and a lower expander is attached to the mandrel by shear pins. A plurality of slips are disposed in curcumferentially spaced relationship about the mandrel and held in place thereon by a plurality of garter springs which extend through the slips. A cage encircles the upper and lower expanders and the slips and includes openings through which the slips project for engagement with the well bore wall. The cage also includes slots through which drag springs that are attached to the upper expander extend for engagement with the well bore wall whereby relative rotation can be accomplished between the mandrel and upper expander to move the slips between set and retracted positions.

REFERENCES:
patent: 2589337 (1952-03-01), Burns
patent: 2825410 (1958-03-01), Brown
patent: 3045758 (1962-07-01), Muse
patent: 3058526 (1962-10-01), Douglass et al.
patent: 3643737 (1972-02-01), Current et al.
patent: 3664417 (1972-05-01), Conrad
patent: 4059150 (1977-11-01), Manderscheid
patent: 4296806 (1981-10-01), Taylor et al.
patent: 4340116 (1982-07-01), Weise

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