Bi-centered drill bit having enhanced casing drill-out...

Details Bi-centered drill bit having enhanced casing drill-out... Bi-centered drill bit having enhanced casing drill-out...

E - Fixed Constructions

21

B

E21B 10/26 (2006.01) E21B 10/42 (2006.01)

Patent

CA 2388948

A bi-center drill bit is disclosed which includes a bit body having pilot blades and reaming blades distributed azimuthally around the body. The blades have cutting elements disposed thereon at selected positions. The body and blades define a longitudinal axis of the bit and a pass-through axis of the bit. In one aspect, selected ones of the pilot blades include thereon, longitudinally between the pilot blades and the reaming blades, a pilot hole conditioning section including gage faces. The gage faces define a diameter intermediate a pilot hole diameter and a pass-through diameter defined, respectively, by the pilot blades and the reaming blades.

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