Fixed blade fixed cutter hole opener

Details Fixed blade fixed cutter hole opener Fixed blade fixed cutter hole opener

2006-09-26

2006-09-26

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

C175S406000

Reexamination Certificate

active

07111694

ABSTRACT:
A hole opener including a tool body having upper and lower ends. The upper and lower ends may be coupled to adjacent drilling tools. At least two blades are formed on the tool body and are arranged so that the hole opener is positioned concentric with a wellbore, and cutting elements are located on the blades. The at least two blades and the cutting elements are arranged to increase a diameter of a previously drilled wellbore.A hole opener including a tool body having upper and lower ends. The upper and lower ends may be coupled to adjacent drilling tools. At least two blades are formed on the tool body and are arranged so that the hole opener is positioned concentric with a wellbore, and cutting elements are located on the blades. The hole opener includes a pilot hole conditioning section. The pilot hole conditioning section includes at least two pilot blades formed on the tool body in a position axially ahead of the blades. The pilot blades include a taper at a downhole end and gage pads positioned at selected diameters. At least one cutting element is disposed on the pilot blades.

REFERENCES:
patent: 2028910 (1936-01-01), MacClatchie
patent: 3568784 (1971-03-01), Kammerer, Jr.
patent: 4385669 (1983-05-01), Knutsen
patent: 4630694 (1986-12-01), Walton et al.
patent: 5385205 (1995-01-01), Hailey
patent: 6412579 (2002-07-01), Fielder
patent: 6715567 (2004-04-01), Delgado et al.
patent: 6729420 (2004-05-01), Mensa-Wilmot
United Kingdom Examination Report dated Jul. 5, 2004 (1 page).
Combined Search and Examination Report dated Jun. 22, 2005 for Application No. GB0504691.7 (7 pages).

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