Cutting element structure for roller cone bit

Details Cutting element structure for roller cone bit Cutting element structure for roller cone bit

2006-12-26

2006-12-26

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S343000, C175S376000

Reexamination Certificate

active

07152701

ABSTRACT:
A roller cone drill bit includes a bit body adapted to be coupled to a drill string, a bearing journal depending from the bit body, and a single roller cone rotatably attached to the bearing journal. The single roller cone has a plurality of cutting elements, where at least one of the plurality of cutting elements is formed of an inner region that is at least partially surrounded by an outer region, where the inner region is more abrasive resistant than the outer region. Such an arrangement in a single roller cone bit allows the at least one cutting element to be “self-sharpening.”

REFERENCES:
patent: 4592433 (1986-06-01), Dennis
patent: 5037704 (1991-08-01), Nakai et al.
patent: 5335738 (1994-08-01), Waldenström et al.
patent: 5379854 (1995-01-01), Dennis
patent: 5590729 (1997-01-01), Cooley et al.
patent: 6439326 (2002-08-01), Huang et al.
patent: 6719073 (2004-04-01), Xiang et al.
patent: 6814162 (2004-11-01), Moran et al.
Combined Search and Examination Report issued in corresponding British Appl. No. GB0601212.4; Dated Mar. 3, 2006; 5 pages.

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