Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1993-12-17
1994-09-13
Britts, Ramon S.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175374, E21B 1000
Patent
active
053460260
ABSTRACT:
An earth-boring bit has a cutter 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, polygonal face, the sides of the polygonal face defining at least a pair of sharp cutting edges and at least a pair of 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. Such an improved gage insert provides an earth-boring bit with improved gage-holding ability, and improved steerability in directional drilling operations.
REFERENCES:
patent: Re32036 (1984-03-01), Dennis
patent: 2774571 (1956-12-01), Morlan
patent: 3137355 (1964-06-01), Schumacher
patent: 3389761 (1968-06-01), Ott
patent: 3461983 (1969-09-01), Hudson et al.
patent: 3858671 (1975-01-01), Kita et al.
patent: 3922038 (1975-11-01), Scales
patent: 3948330 (1976-04-01), Langford, Jr.
patent: 4058177 (1977-11-01), Langford et al.
patent: 4140189 (1979-02-01), Garner
patent: 4298079 (1981-11-01), Norlander et al.
patent: 4301877 (1981-11-01), Cloud
patent: 4359335 (1982-11-01), Garner
patent: 4624329 (1986-11-01), Evans et al.
patent: 4694918 (1987-09-01), Hall
patent: 4729440 (1988-03-01), Hall
patent: 4738322 (1988-04-01), Hall et al.
patent: 4832139 (1989-05-01), Minikus et al.
patent: 4940099 (1990-06-01), Deane et al.
patent: 4984643 (1991-01-01), Isbell et al.
patent: 5025874 (1991-06-01), Barr et al.
patent: 5145016 (1992-09-01), Estes
"Smith Steerable-Motor Bits on Target for Your Drilling Program," Promotional Brochure, Smith International, Inc.
Pessier Rudolf C. O.
Scott Danny E.
Baker Hughes Incorporated
Britts Ramon S.
Felsman Robert A.
Perdue Mark D.
Tsay Frank S.
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