Drag type drill bit

Details Drag type drill bit Drag type drill bit

1985-08-06

1987-04-28

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175410, E21B 1046

Patent

active

046606599

ABSTRACT:
A drag-type drill bit comprises a bit body having an operating end face and a multiplicity of superhard cutting elements interlocked to the bit body. The cutting elements define a multiplicity of cutting areas dispersed over the operating end face of the bit body in a pattern adapted to cause the cutting areas to cut an earth formation to a desired three-dimensional profile as the bit body is rotated. The cutting areas have back rake angles which become more negative with distance from said profile.

REFERENCES:
patent: 1859717 (1932-05-01), Rutrle
patent: 2966949 (1961-01-01), Wepsala, Jr.
patent: 3239275 (1966-03-01), Belugou
patent: 3575247 (1971-04-01), Feenstra
patent: 3599736 (1971-08-01), Thompson
patent: 4108260 (1978-08-01), Bozarth
patent: 4334585 (1982-06-01), Upton
patent: 4538690 (1985-09-01), Short, Jr.
patent: 4558753 (1985-12-01), Barr

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