Bi-center bit with oppositely disposed cutting surfaces

Details Bi-center bit with oppositely disposed cutting surfaces Bi-center bit with oppositely disposed cutting surfaces

1997-10-21

1999-11-30

Bagnell, David J

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175385, 175399, E21B 1026, E21B 1056

Patent

active

059925485

ABSTRACT:
An improved bi-center bit with improved directional stability and wear resistance is disclosed, which bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further the pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.

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