Sub-reamer for bi-center type tools
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United States of America Patent
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Jul 5, 2005
Grant Date -
May 27, 2004
app pub date -
Nov 21, 2002
filing date -
Nov 21, 2002
priority date (Note) -
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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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