Rotary drag bits including abrasive-impregnated cutting structures

摘要

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.

主权项

1. 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; a third abrasive-impregnated cutting structure extending along a rotationally leading surface of a third, 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; and wherein a third wear resistance of the third abrasive-impregnated cutting structure at a third distance from the longitudinal axis is different from the first wear resistance and the second wear resistance at the first radial distance and the second radial distance.