Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Patent
1995-06-06
1997-08-12
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
Cutting edges facing in opposite axial directions
175408, 175426, E21B 1046, E21B 1204
Patent
active
056556128
ABSTRACT:
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 cutting end of the gage insert has a cutting end defining at least one sharp cutting edge and at least one cutting surface that define a negative rake angle with respect to the sidewall of the borehole that is being sheared by the gage insert. The cutting end, 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 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.
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Grimes Robert Earl
Pessier Rudolf Carl Otto
Scott Danny Eugene
Baker Hughes Inc.
Felsman Robert A.
Perdue Mark D.
Tsay Frank
LandOfFree
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