Drill out bi-center bit and method for using same

Details Drill out bi-center bit and method for using same Drill out bi-center bit and method for using same

2005-08-09

2005-08-09

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Processes

C175S391000, C175S385000, C175S399000

Reexamination Certificate

active

06926099

ABSTRACT:
A drill out bi-center bit and a method for using the same are provided that offer the ability to drill out cement and casing shoes, and increased stability. The bi-center bit includes a bit body having a first end operable to be coupled with a drill string, a second end including a pilot section, and an eccentric reamer section intermediate the first and second ends. A first plurality of cutter assemblies is disposed upon the exterior surface of the pilot section, while a second plurality of cutter assemblies is disposed upon the reamer section. A plurality of recessed cutter assemblies is also disposed upon the pilot section, such that the recessed cutter assemblies are located within a radius beginning at a central axis of the pilot section and terminating at a central axis of the reamer section and are recessed with respect to a lower surface of the pilot.

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