Patent ID: 8047307
Filing Date: 2011-11-01
Classification: E21B

Abstract:
1. A hybrid drill bit comprising: a bit body with an axis; at least one blade extending longitudinally and radially outward from the bit body; at least one rolling cutter assembly mounted on the bit body; at least one primary cutter including a cutting surface protruding at least partially from the at least one blade and located to traverse a cutting path upon rotation of the bit body about the axis; and a plurality of cutters, each cutter of the plurality of cutters positioned to substantially follow the at least one primary cutter along the cutting path upon rotation of the bit body about its axis, and at least one cutter of the plurality of cutters having a non-zero side rake angle, wherein each cutter having a non-zero side rake angle is oriented to deflect material in a common direction with respect to the cutting path.