Sub-reamer for bi-center type tools

Details Sub-reamer for bi-center type tools Sub-reamer for bi-center type tools

2005-07-05

2005-07-05

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

C175S398000

Reexamination Certificate

active

06913098

ABSTRACT:
An improved bi-center with improved directional stability and wear resistance is disclosed, said 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 said pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.

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