Abstract: An abrasive-impregnated cutting structure for use in drilling a subterranean formation is disclosed. The abrasive-impregnated cutting structure may comprise a plurality of abrasive particles dispersed within a substantially continuous matrix, wherein the abrasive-impregnated cutting structure exhibits an anisotropic wear resistance. One or more of the amount, average size, composition, properties, shape, quality, strength, and concentration of the abrasive particles may vary within the abrasive-impregnated cutting structure. Anisotropic wear resistance may relate to a selected direction, such as, for example, one or more of an expected direction of engagement of the abrasive-impregnated cutting structure with the subterranean formation and an anticipated wear direction. Anisotropic wear resistance of an abrasive-impregnated cutting structure may be configured for forming or retaining a formation-engaging leading edge thereof.

Abstract: A rotary drill bit is disclosed, including at least one cutting element affixed thereto and configured to form a distinct borehole surface in response to drilling a subterranean formation. At least one substantially helically extending feature associated with the at least one cutting element may be formed upon the leading end of the rotary drill bit. Alternatively, a rotary drill bit may include a plurality of substantially helically extending features. Methods of operating a rotary drill bit are also disclosed. Specifically, a subterranean formation may be drilled with a rotary drill bit to form an on-center bottomhole pattern, which may be at least partially contacted by at least one substantially helically extending feature of the rotary drill bit. Alternatively, a subterranean formation may be contacted with at least one substantially helically extending feature of the rotary drill bit. A method of designing a rotary drill bit is disclosed.