Fluid pressure actuated well tool

Wells – Packers or plugs – With expanding anchor

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Details

166212, 166217, 92 10, E21B 302

Patent

active

044237774

ABSTRACT:
A packer for a subterranean well has slip elements and elastomeric seal elements which are respectively radially expandable into engagement with a well conduit wherein the packer is mounted in surrounding relationship to an inner sleeve which is rigidly interconnectable to a second conduit. An intermediate sleeve is mounted in axially slidable, concentric relationship to the inner sleeve and cooperates with an outer sleeve to define an annular fluid pressure chamber. A upper piston and a lower piston are mounted in the annular pressure chamber and are driven in opposite directions by application of fluid pressure to such chamber. Compressive forces are thus transmitted to the elastomeric sealing elements and a slip mechanism. The packer also incorporates a hydraulic reservoir which is normally filled with casing fluid and has a constricted orifice connected to the casing annulus. Such reservoir is diminished in volume by any upward movement of the inner sleeve relative to the intermediate sleeve and the flow area of the orifice is proportioned to exert a throttling action on fluid discharge from the reservoir.

REFERENCES:
patent: 2137403 (1938-11-01), Hoferer
patent: 2275935 (1942-05-01), Baker
patent: 2546377 (1951-03-01), Turechek
patent: 2807326 (1957-09-01), Church
patent: 3136364 (1964-06-01), Myers
patent: 3456723 (1969-07-01), Current et al.
patent: 4263968 (1981-04-01), Garner

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