Patent ID: 8689908

Claim:
A drill bit for drilling a borehole in earthen formation, the bit comprising: a bit body having a bit axis and a bit face; a plurality of primary blades, each primary blade extending radially along the bit face, each primary blade includes a cutter-supporting surface, the cutter-supporting surface of one or more of the primary blades defines a composite blade profile in rotated profile view extending from proximate the bit axis to an outer radius of the bit body; and a plurality of cutter elements mounted to the cutter-supporting surface of the plurality of primary blades, wherein: each cutter element has a forward-facing cutting face with a cutting edge adapted to penetrate and shear the earthen formation; the cutting faces of the plurality of cutter elements define a composite outermost cutting profile in rotated profile view that extends radially from a first end proximate the bit axis to a second end at the radially outermost gage region; at least a portion of the composite outermost cutting profile extends an axial distance beyond the composite blade profile; the composite outermost cutting profile includes at least one concave region radially offset from the bit axis; the cutting face of each cutter element defining the composite outermost cutting profile disposed between the cutter element at the first end and the cutter element at the second end of the composite outermost cutting profile partially overlaps with the cutting faces of two adjacent cutter elements in rotated profile view.