Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1992-01-31
1994-02-22
Bui, Thuy M.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
E21B 1000
Patent
active
052879364
ABSTRACT:
A cutter of an earth-boring bit is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The gage insert has a substantially flat face with sharp cutting edges formed thereon and has cutting surfaces that define a negative rake angle with respect to the sidewall of the borehole that is being sheared by the gage insert. The face, cutting edge, and cutting surface of the gage insert are formed of a super-hard and abrasion-resistant material such as polycrystalline diamond or cubic boron nitride. The body of the insert is formed of a hard, fracture-tough material such as cemented tungsten carbide. The improved gage inserts are secured into sockets in the gage surface of the rolling cone cutter by interference fit. The improved gage inserts provide an actively cutting gage surface that engages the sidewall of the borehole to promote shearing removal of the sidewall material.
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"Smith Steerable-Motor Bits on Target for Your Drilling Program," Promotional Brochure, Smith International, Inc.
Grimes Robert E.
Scott Danny E.
Baker Hughes Incorporated
Bui Thuy M.
Tsay Frank S.
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