Mechanical wireline borehole packer

Wells – Packers or plugs – With expanding anchor

Patent

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Details

166202, 175317, 175321, E21B 3312

Patent

active

044820135

ABSTRACT:
A wireline supported mechanically operable packer device (10) for use in a drill string (DS) casing (C) and attached core drill bit (B) raised off the bottom of a borehole and testing the formation below has a housing (12) adapted to engage an arresting internal shoulder (S) of the core drill bit (B). A hollow inner mandrel (40) slideable in the housing has attached thereto a packer seal cup (P) an O-ring seal (P) expander (50) weight means (60) and wireline means (70) (80) moveable between stops (16) (18) determining the extended and contracted positions thereof relative to the housing. Upon lowering the wireline (70) (80) and weight means (60) the attached inner mandrel continues its downward movement relative to the arrested housing (12) and toward the contracted, locked sealing position, and thereby actuates means (30) locking the housing to the casing (C), ejects the initially contracted and stored packer seal (P) from an end chamber of the housing whereupon it expands into sealing engagement with the borehole wall below and the expander means expands the O-ring (R) against the internal surface of the casing. Fluid under pressure is then pumped through casing (C) and inner mandrel to test formation after which the packer device can be retrieved and hoisted out by wireline whereby a reverse sequence of movements of the various elements occurs during return of the device to its initial extended unlocked non-sealing position.

REFERENCES:
patent: 2230712 (1941-02-01), Bendeler et al.
patent: 2618345 (1952-11-01), Tucker
patent: 2691418 (1954-10-01), Connolly
patent: 2854080 (1958-09-01), Dale et al.
patent: 3646995 (1972-03-01), Manes et al.
patent: 3741305 (1973-06-01), Young et al.
patent: 4357992 (1982-11-01), Sweeney

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