Rotary drag bits including abrasive-impregnated cutting structures
AssigneeBaker Hughes Incorporated
InventorsVan J. Brackin, Jeffrey B. Lund, Danny E. Scott, Marcus R. Skeem, Matthew R. Isbell
Life of this patent
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Abstract
Rotary drag bits comprise a body comprising a face at a leading end of the body. An abrasive-impregnated cutting structure is located at the face of the body. The abrasive-impregnated cutting structure comprises abrasive particles dispersed within a matrix material. The abrasive-impregnated cutting structure exhibits an anisotropic wear resistance. The wear resistance varies at least substantially continuously within the abrasive-impregnated cutting structure.
Claims23
An earth-boring drill bit, comprising:
- a body comprising a longitudinal axis;
- blades extending from a remainder of the body, junk slots being defined between the blades, the blades extending radially from proximate the longitudinal axis to a gage region of the body, the blades extending longitudinally from a leading end of the body toward a trailing end of the body;
- a first abrasive-impregnated cutting structure extending along a rotationally leading surface of a first blade;
- and
- a second abrasive-impregnated cutting structure extending along a rotationally leading surface of a second, different blade;
- wherein a first wear resistance of the first abrasive-impregnated cutting structure at a first radial distance from the longitudinal axis is different from a second wear resistance of the second abrasive-impregnated cutting structure at a second, different radial distance from the longitudinal axis.
An earth-boring drill bit, comprising:
- a body comprising a longitudinal axis;
- blades extending from a remainder of the body, junk slots being defined between the blades, the blades extending radially from proximate the longitudinal axis to a gage region of the body, the blades extending longitudinally from a leading end of the body toward a trailing end of the body;
- and
- an abrasive-impregnated cutting structure extending along a rotationally leading surface of a blade, the abrasive-impregnated cutting structure exhibiting anisotropic wear resistance;
- wherein a first wear resistance of the abrasive-impregnated cutting structure at a first radial distance from the longitudinal axis is different from a second wear resistance of the abrasive-impregnated cutting structure at a second, different radial distance from the longitudinal axis.
An earth-boring drill bit, comprising:
- a body comprising a longitudinal axis;
- blades extending from a remainder of the body, junk slots being defined between the blades, the blades extending radially from proximate the longitudinal axis to a gage region of the body, the blades extending longitudinally from a leading end of the body toward a trailing end of the body;
- and
- an abrasive-impregnated cutting structure extending along a rotationally leading surface of a blade, the abrasive-impregnated cutting structure exhibiting anisotropic wear resistance;
- wherein a wear resistance of the abrasive-impregnated cutting structure decreases as distance from a leading edge of the abrasive-impregnated cutting structure toward a trailing edge of the blade increases.
Dependencies are inferred from the claim text.