Multi profile performance enhancing concentric drill bit

Details Multi profile performance enhancing concentric drill bit Multi profile performance enhancing concentric drill bit

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) E21B 10/26 (2006.01)

Patent

CA 2422262

A novel drill bit includes a cutting reamer portion that cuts to gage diameter, and a pilot portion that cuts to a radius about 50% - 80% of the reamer portion. The pilot portion extends downward from the reamer portion to create a distinct cutting area including pilot. The torque and weight on bit is evenly distributed between said pilot portion and said reamer portion of said drill bit by iterative adjustment of criteria such as backrake, siderake, cutter height, cutter size, and blade spacing.

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