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CLASSIC BIT KINEMATICS—2: True kinematics opens way to bit improvement

02/11/2008
In the first part of this series, published last week (OGJ, Feb. 4, 2008, p. 46), we began to show how roller cone bit design analysis can predict cone behavior, with heel teeth having equal pitch.This second of four articles presents how bit kinematics are modeled differently when the heel teeth on all roller cones have varied pitch.In this case, after completing a third of the bit revolution, the well-bottom rack will consist of three sectors, each sector resulting from the interaction of the corresponding cone with the well bottom and having its own, individual profile. The further rolling of the well-bottom rack during bit rotation will be determined by this initial profile, which set...
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