Patent ID: 8066084
Filing Date: 2011-11-29
Classification: E21B

Abstract:
1. A rotary drill bit for subterranean drilling, comprising: a bit body including a face comprising at least a cone region proximate a centerline of the bit body and a nose region radially outward from the cone region, the face having a plurality of blades thereover, blades of the plurality extending generally radially outward toward a gage region, at least one blade of the plurality having a radially inner end proximate the centerline; and superabrasive cutters disposed on each blade of the plurality, wherein superabrasive cutters within the cone region generally exhibit a reduced exposure above a blade bearing surface on a blade on which the superabrasive cutters within the cone region are respectively disposed, in comparison to an exposure above a blade surface generally exhibited by superabrasive cutters within the nose region.