Patent ID: 8109346

Claim:
A drill bit, comprising: a drill bit body; first and second blades formed on said drill bit body, at least one of said first and second blades supporting two rows of cutting elements mounted thereon; a first row of cutting elements including a first cutting element mounted on said blade supporting two rows of cutting elements, said first cutting element having a first cutting surface geometry corresponding to a first cutting profile; a second row of cutting elements including a second cutting element mounted on said blade supporting two rows of cutting elements, said second cutting element having a second cutting surface geometry corresponding to a second cutting profile, wherein the second cutting surface geometry is different from the first cutting surface geometry; wherein said first and second cutting elements are positioned on said first and second rows, respectively, so that said first and second cutting profiles substantially but do not completely overlap each other such that the first cutting profile does not completely contain the second cutting profile and the second cutting profile does not completely contain the first cutting profile, said overlap creating a high density zone in a middle region of said first and second cutting profiles and a low density zone on a periphery of said first and second cutting profiles; wherein a major axis of one of said first and second cutting elements is aligned with a corresponding axis of another one of said first and second cutting elements so that said axes substantially line up when said first and second cutting elements are rotated onto a same radial plane.