Earth-boring bit with an advantageous cutting structure
AssigneeBaker Hughes Incorporated
InventorsMatthew R. Isbell, Rudolf C. O. Pessier
Life of this patent
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Abstract
An earth-boring bit is provided with three cutters, two of the three cutters are provided with heel disk cutting elements defined by a pair of generally oppositely facing disk surfaces that generally continuously converge to define a circumferential heel disk crest. One of the two cutters having heel disk elements is further provided with an inner disk cutting element.
Claims21
An earth-boring bit with an improved rate of penetration into earthen formations, the earth-boring bit comprising:
- a bit body;
- at least two cutters mounted for rotation on a bearing shaft depending from the bit body, each cutter having a base and a nose;
- a heel disk cutting element disposed proximally to the base of at least one of the cutters and defined by a pair of generally oppositely facing disk surfaces that generally continuously converge to define a circumferential heel disk crest;
- and
- a plurality of cutting teeth having axial crests thereon arranged in a plurality of rows on at least a second of the cutters, the plurality of rows including a heel row.
An earth-boring bit with an improved rate of penetration into earthen formations, the earth-boring bit comprising:
- a bit body;
- at least two cutters mounted for rotation on a bearing shaft depending from the bit body, each of the cutters having a base and a nose;
- a heel disk cutting element disposed proximally to the base of at least one of the cutters and defined by a first pair of generally oppositely facing disk surfaces that generally continuously converge to define a circumferential heel disk crest;
- an inner disk cutting element disposed intermediate the base and nose of at least the cutter having a heel disk cutting element, the inner disk cutting element defined by a second pair of generally oppositely facing disk surfaces that generally continuously converge to define a circumferential inner disk crest;
- and
- a plurality of cutting teeth having axial crests thereon arranged in a plurality of rows on at least another of the cutters, the plurality of rows including a heel row.
An earth-boring bit of the milled tooth variety having an improved rate of penetration into earthen formations, the earth-boring bit comprising:
- a bit body;
- three cutters, each cutter mounted for rotation on a bearing shaft depending from the bit body, each cutter having a base, a nose, and at least one of the cutters having a plurality of cutting teeth formed thereon in rows, at least a portion of the cutting teeth having axial crests thereon;
- at least a first of the three cutters including:
- an inner disk cutting element disposed intermediate the base and nose of the first cutter, the inner disk cutting element defining a circumferential inner disk crest;
- and
- a heel disk cutting element disposed proximally to the base of the first cutter, the heel disk cutting element defining a circumferential heel disk crest;
- at least a second of the three cutters including a heel disk cutting element disposed proximally to the base of the second cutter, the heel disk cutting element defining a circumferential heel disk crest;
- and
- a third of the three cutters having at least a heel row of cutting teeth having axial crests.
Dependencies are inferred from the claim text.