Earth-boring bit having shear-cutting inner row elements

Details Earth-boring bit having shear-cutting inner row elements Earth-boring bit having shear-cutting inner row elements

1996-08-12

1998-05-05

Tsay, Frank

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175428, 175430, 175431, 175434, E21B 1016, E21B 1052

Patent

active

057462801

ABSTRACT:
An earth-boring bit has a bit body and at least one cantilevered bearing shaft depending inwardly and downwardly from the bit body. A cutter is mounted for rotation on the bearing shaft and includes a plurality of cutting elements arranged in generally circumferential rows, including inner heel rows, of cutting elements. At least one of the cutting elements in one of the inner rows has a crest at least partially formed of super-hard material that defines a cutting edge and cutting surface for shearing engagement with the bottom of the borehole during drilling operations, the remainder of the cutting end of the element is formed of hard, fracture-tough material for crushing engagement with the bottom of the borehole.

REFERENCES:
patent: 4058177 (1977-11-01), Langford, Jr. et al.
patent: 4334586 (1982-06-01), Schumacher
patent: 4343371 (1982-08-01), Baker, III et al.
patent: 4359335 (1982-11-01), Garner
patent: 4694918 (1987-09-01), Hall
patent: 4854405 (1989-08-01), Stroud
patent: 4940099 (1990-07-01), Deane et al.
patent: 5025874 (1991-06-01), Barr et al.
patent: 5201376 (1993-04-01), Williams
patent: 5282512 (1994-02-01), Besson et al.
patent: 5287936 (1994-02-01), Grimes et al.
patent: 5322138 (1994-06-01), Siracki
patent: 5341890 (1994-08-01), Cawthorn et al.

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