Inventors:
Roger Silva - Houston TX
Brad Weston - Houston TX
Henry Rebollido - Sugar Land TX
Coy M. Fielder - Cypress TX
Assignee:
Diamond Products International, Inc. - Houston TX
International Classification:
E21B 1026
E21B 1056
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.