CPC E21B 10/43 (2013.01) [E21B 10/55 (2013.01)] | 19 Claims |
1. A drill bit, comprising:
a body having a face and a central bit axis; and
a plurality of blades disposed on the face of the body, each of the plurality of blades having a row of cutters disposed thereon, the rows of cutters collectively defining a cutting profile of the drill bit, wherein:
wherein a nose region and a cone region of the face, at least six radially adjacent cutters of the cutters along the cutting profile having alternating positive back rake angles;
at least some adjacent cutters of the cutters along the cutting profile have non-alternating back rake angles; and
the difference between a majority of back rake angles on adjacent cutters along the cutting profile is less than 20°.
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