Patent ID: 8091654

Claim:
A drill bit for drilling through an earthen formation to form a borehole with a bottom and a sidewall, the drill bit having a full gage diameter with a radius R and comprising: a bit body having a central axis, an internal plenum, and an underside generally facing the borehole bottom, wherein the underside includes a central region disposed about the central axis, an annular outer region, and an annular intermediate region radially disposed between the central region and the annular outer region; wherein the bit body includes an outer receptacle having a central axis and extending from the plenum to the annular outer region of the underside; a first and a second cone cutter, each of the cone cutters being mounted to the bit body and adapted for rotation about a different cone axis; wherein each cone cutter comprises an inner region proximal the central axis of the bit body, an outer region distal the central axis of the bit body, and an intermediate region extending between the inner region and the outer region; wherein the inner region, the intermediate region, and the outer region each include a plurality of cutting elements; an outer sleeve having an upstream end, a downstream end, and a through passage extending between the upstream end and the downstream end, wherein the upstream end is coaxially received by the outer receptacle; an outer nozzle received by the downstream end of the outer sleeve, wherein the through passage includes an upstream section having an upstream axis and a downstream section having a downstream axis that is skewed at an angle α relative to the upstream axis, and wherein the downstream axis and the upstream axis intersect in a portion of the sleeve that is one uniform piece; and wherein a projection of the downstream axis passes between the outer regions of the first and second cone cutters.