Flat profile cutting structure for roller cone drill bits

Details Flat profile cutting structure for roller cone drill bits Flat profile cutting structure for roller cone drill bits

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) E21B 10/16 (2006.01)

Patent

CA 2349774

A drill bit including a roller cone and a plurality of cutting elements. The roller cone is affixed to a bit body and is arranged circumferentially about a bit axis of rotation. In one aspect, the cutting elements are arranged so that the crests of at least half of the cutting elements are within about 10 degrees of perpendicularity to the bit axis when each of these cutting elements is in a downwardmost rotary orientation. In another aspect, the roller cone and the cutting elements are arranged so that crests on the cutting elements define a substantially flat profile. Substantially flat in this aspect includes the profile having an endmost angle, either at the gage side or the centerline side, with respect to perpendicular to the bit axis, of less than about 11 degrees.

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