Pdc drill bit having cutting structure adapted to improve...

Details Pdc drill bit having cutting structure adapted to improve... Pdc drill bit having cutting structure adapted to improve...

E - Fixed Constructions

21

B

E21B 10/46 (2006.01) E21B 10/42 (2006.01) E21B 10/54 (2006.01)

Patent

CA 2397436

A drill bit is disclosed which includes a bit body having a plurality of blades thereon. The blades have a plurality of cutting elements affixed thereon at selected positions. The cutting elements are disposed into at least two groups. A first one of the groups has at least 60 percent of the cutting elements therein disposed at a first mean backrake angle. A second group has at least 60 percent of the cutting elements therein disposed at a second mean backrake angle. The second backrake angle is at least about fifteen degrees more than the first backrake angle. A bottom hole coverage of the cutting elements in the second group is at least about eighty percent.

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