Rotary drill bits exhibiting cutting element placement for optimizing bit torque and cutter life
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United States of America Patent
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Feb 21, 2006
Grant Date -
Feb 27, 2003
app pub date -
Aug 30, 2002
filing date -
Sep 8, 1997
priority date (Note) -
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Abstract
A superabrasive cutter-equipped rotary drag bit especially suitable for directional drilling in subterranean formations is provided. The bit may employ PDC cutters in an engineered cutter placement profile exhibiting optimal aggressiveness in relation to where the cutters are positioned along the profile of the bit extending from a cone region laterally, or radially, outward toward a gage region therefore. The engineered cutter placement profile may include cutters exhibiting differing degrees of aggressiveness positioned in order to maximize rate-of-penetration and minimize torque-on-bit while maintaining side cutting capability and steerability.
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