Wellbore cleaning tool and method

Details Wellbore cleaning tool and method Wellbore cleaning tool and method

2006-05-11

2010-06-15

Thompson, Kenneth (Department: 3672)

Wells

With electrical means

Magnetic

C166S311000, C166S173000

Reexamination Certificate

active

07735547

ABSTRACT:
There is disclosed a cleaning tool for use in cleaning ferrous material from a wellbore, a cleaning assembly comprising a plurality of such wellbore cleaning tools, and a method of cleaning ferrous materials from a wellbore.In one embodiment, a cleaning tool (12) is disclosed which comprises a tool main body (19) and a number of magnets (20) mounted for selective movement relative to the main body between deactivated and activated positions. When in the activated positions, the magnets serve for attracting ferrous material present in a wellbore (10), to collect such material during passage of the tool along the wellbore, so that the ferrous material may be returned to surface to thereby clean the wellbore.

REFERENCES:
patent: 2005/0028982 (2005-02-01), Howlett et al.
patent: 2350632 (2000-12-01), None
patent: 2004088091 (2004-10-01), None
International Preliminary Report on Patentability corresponding to International Application No. PCT/GB2006/001733 dated Nov. 13, 2007 (1 page).
Written Opinion of the International Searching Authority corresponding to International Application No. PCT/GB2006/001733 dated Nov. 13, 2007 (6 pages).

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