Patent ID: 6161634
Filing Date: 2000-12-19
Classification: B33Y,E21B

Abstract:
A drill bit for cutting a formation, comprising:a bit body having a bit axis;a plurality of rolling cone cutters rotatably mounted on cantilevered bearing shafts on said bit body, each rolling cone cutter having a generally conical surface;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 intermeshing with said first primary cutter elements; andat least one of said primary cutter elements having a non-rectilinear crest and a base portion adapted to fit into a corresponding socket on a rolling cone cutter.