Embedded flex-lock slip liner hanger

Wells – Processes – Placing or shifting well part

Reexamination Certificate

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Details

C166S208000, C166S216000

Reexamination Certificate

active

07431096

ABSTRACT:
A liner hanger includes an annular slip seat that radially surrounds a section of the liner being hung. The slip seat contains a plurality of windows that each accommodates at least one intermediate slip seat. The intermediate slip seats, in turn, each contain windows that accommodate a slip element. There are tongue and groove arrangements between the slip seat and the intermediate slip seat as well as between the intermediate slip seat and the slip element that allow axial movement of the slip element to be translated by camming surfaces into radial outward movement of both the intermediate slip seat and the slip element. The imposition of one or more intermediate slip seats, in an embedded or nested relationship, allows for greater radial expansion of the slip elements with respect to the interior liner.

REFERENCES:
patent: 2879851 (1959-03-01), Wilson et al.
patent: 3999605 (1976-12-01), Braddick
patent: 4497368 (1985-02-01), Baugh
patent: 5086845 (1992-02-01), Baugh
patent: 5474126 (1995-12-01), Lynde et al.
patent: 5542473 (1996-08-01), Pringle
patent: 5566762 (1996-10-01), Braddick et al.
patent: 6431277 (2002-08-01), Cox et al.
patent: 6722428 (2004-04-01), Yokley
patent: 2124275 (1984-02-01), None
patent: WO 93/20329 (1993-10-01), None

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