Patent ID: 6176329
Filing Date: 2001-01-23
Classification: E21B

Abstract:
A drill bit for cutting a formation, comprising:a bit body having a bit axis;a plurality of rolling cone cutters rotatable mounted on cantilevered bearing shafts on said bit body, each rolling cone cutter having a generally conical surface;a plurality of gage row primary cutter elements extending from one of said cone cutters in a gage row, said gage row extending to full gage;a first plurality of primary cutter elements extending from a first of said cone cutters in a first row, said first row extending to less than full gage;a second plurality of primary cutter elements extending from a second cone cutter in a second row, said second row extending to less than full gage, said second primary cutter elements overlapping said first primary cutter elements when revolved into a single plane; andat least one ridge-cutting cutter element extending from said first cone cutter and having an elongated crest oriented approximately perpendicular to a projection of the cone axis.