Patent ID: 8448727

Claim:
A rotary drill bit, comprising: a bit body configured for drilling a subterranean formation, the bit body including a plurality of blades, each of the plurality of blades having a plurality of polycrystalline diamond cutting elements affixed thereto, at least one of the plurality of polycrystalline diamond cutting elements including: a polycrystalline diamond table including: a matrix including a plurality of coarse-sized diamond grains, the coarse-sized diamond grains exhibiting a coarse-sized average grain size of at least about 6 μm and at least a bimodal grain size distribution; and a plurality of polycrystalline diamond regions dispersed within the matrix, at least a portion of the polycrystalline diamond regions including a plurality of fine-sized polycrystalline diamond grains exhibiting a fine-sized average grain size less than the coarse-sized average grain size, each of the at least a portion of the polycrystalline diamond regions exhibiting an average size of at least about 50 μm; and a substrate bonded to the polycrystalline diamond table.