Downhole tool

Details Downhole tool Downhole tool

2008-01-18

2010-11-09

Neuder, William P (Department: 3672)

Wells

Processes

Freeing stuck object, grappling or fishing in well

C166S098000, C166S099000

Reexamination Certificate

active

07828062

ABSTRACT:
An extension sub for a downhole fishing tool, the extension sub comprising a tubular having a threaded pin end and a threaded box end, the tubular having an interior wall defining a bore, and cutting elements fixed to the interior wall of the tubular and extending into the bore of the tubular. Such a device may be referred to as a string shoe.

REFERENCES:
patent: 1793105 (1931-02-01), Lidderdale
patent: 2304793 (1942-12-01), Bodine, Jr.
patent: 6758267 (2004-07-01), Sollesnes
patent: 6805197 (2004-10-01), Brumley et al.
patent: 2005/0006102 (2005-01-01), Cho
Bowen Tools Inc Catalog, 3 pages (pp. 3,12, 13) Bowen Tools 1990, USA.
Instruction Manual Bowen “Itcoloy” and Milling Tools, 4 pages (index and pp. 3,4,6) Bowen Tools, Oct. 1979.

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