Release/anti-preset mechanism for down-hole tools

Details Release/anti-preset mechanism for down-hole tools Release/anti-preset mechanism for down-hole tools

1995-07-03

1997-06-10

Neuder, William P.

Wells

Packers or plugs

With expanding anchor

166181, E21B 2306

Patent

active

056366892

ABSTRACT:
This invention relates to a release/anti-preset mechanism for retrieving a down-hole tool and for preventing premature actuation of the tool during insertion thereof into a subterranean well-bore. Release mechanisms for retrieving down-hole tools are known and can be divided into three main types: shear release systems, conventional wireline/coil tubing/drill pipe (WL, CT, DP) actuated systems and hydraulically activated systems. Known mechanisms suffer from a number of problems. Accordingly the present invention provides a retrievable down-hole tool (5) having a release/anti-preset mechanism comprising first and second members (10, 15) radially releasably engagable by a third member (20) which controls radial deflection of one of the first or second members (10, 15).

REFERENCES:
patent: 4438811 (1984-03-01), Patel
patent: 4457369 (1984-07-01), Henderson
patent: 4648445 (1987-03-01), Caskey
patent: 4712621 (1987-12-01), Wightman et al.
patent: 4984631 (1991-01-01), Reesing

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