Wells – Packers or plugs – With expanding anchor
Patent
1996-04-24
1997-11-25
Tsay, Frank
Wells
Packers or plugs
With expanding anchor
166134, 166139, E21B 2306
Patent
active
056901720
ABSTRACT:
The invention relates to a seal-sub packer assembly which is formed by a two-mandrel packer and a setting tool which positions the packer within the casing. A lower mandrel of the packer is provided with internal threads for engagement with the setting tool, thereby preventing premature setting of the packer. The exterior surface of the lower mandrel carries one or more sealing members which are compressed and forced to expand horizontally when the upper mandrel slides downwardly, shearing shear screws in response to a downward force acting on the setting tool. In an alternative embodiment, a liner hanger is secured to the lower mandrel, the liner hanger carrying an annular band with an inverted J-shaped slot through which a pin extends. When the body of the packer assembly is rotated in a predetermined direction, the guide pin extending through the J-slot resists premature setting of the packer.
REFERENCES:
patent: Re31933 (1985-07-01), Taylor et al.
patent: 4156460 (1979-05-01), Crowe
patent: 4180132 (1979-12-01), Young
patent: 4281711 (1981-08-01), Braddick et al.
patent: 4438811 (1984-03-01), Patel
patent: 4665977 (1987-05-01), Mullins
patent: 4898245 (1990-02-01), Braddick
patent: 5318117 (1994-06-01), Echols, III et al.
Alexander Oil Tools, Inc.
Tsay Frank
LandOfFree
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