Bi-center bit with oppositely disposed cutting surfaces

Year	Description
1997	Invention patented by Roger Silva, Brad Weston, Henry Rebollido, and Coy M. Fielder on October 20th, 1997. 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.
Source: selected by the editor from original sources.

Invention: Bi-center bit with oppositely disposed cutting surfaces