Magnet arrangement and method for use on a downhole tool

Details Magnet arrangement and method for use on a downhole tool Magnet arrangement and method for use on a downhole tool

2006-11-21

2006-11-21

Bagnell, David (Department: 3672)

Wells

Processes

Freeing stuck object, grappling or fishing in well

C166S099000, C166S068500, C294S065500

Reexamination Certificate

active

07137449

ABSTRACT:
The present invention relates to a downhole tool for removing metallic debris from a well bore. The downhole tool includes a plurality of magnets disposed on the tool body. The plurality of magnets are arranged in a bucking arrangement such that repulsing forces are generated between neighboring pairs of the plurality of magnets. The bucking arrangement results in an expanded reach of the magnetic fields of the magnets to enhance the removal of metallic debris.

REFERENCES:
patent: 3637033 (1972-01-01), Mayall
patent: 6269877 (2001-08-01), Zeer et al.
patent: 6354386 (2002-03-01), Ruttley
patent: 6357539 (2002-03-01), Ruttley
patent: 6491117 (2002-12-01), Ruttley
patent: 6629562 (2003-10-01), Fidan
patent: 6655462 (2003-12-01), Carmichael et al.
patent: 6702940 (2004-03-01), Blange
International Search Report dated Feb. 28, 2006 for Application No. PCT/US05/20478 (4 pages).

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