Patent ID: 6772848
Filing Date: 2004-08-10
Classification: E21B

Abstract:
A drill bit for drilling a subterranean formation, comprising:a bit body having a face at one end thereof and structure at an opposing end thereof for connecting the bit to a drill string; and at least one cutter mounted to the bit body over the bit face and comprising: a substrate having a longitudinal centerline and a substantially circular end face, the end face comprising, as taken in radial cross-section longitudinally parallel to the longitudinal centerline a non-sinusoidal, non-periodically repeating topographic configuration including at least one annular surface exhibiting an arcuate shape defined by at least a portion of a surface of revolution of a radius about a center point and exhibiting a unique size and shape in comparison to the size and shape of any other surface of the end face, wherein the at least one annular surface comprises a spherical surface of revolution including a center point coincident with the centerline; and a volume of superabrasive material disposed over the end face and having a two-dimensional cutting face spaced from the substrate end face, the cutting face having a peripheral cutting edge.