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CLASSIC BIT KINEMATICS—3: Pure rolling of bit cones doubles performance

02/25/2008
The first two parts of this series showed that roller cone bit design analysis can predict cone behavior when heel teeth have equal pitch and how bit kinematics are modeled differently when the heel teeth on roller cones have varied pitch (OGJ, Feb. 4, 2008, p. 46; Feb. 11, 2008, p. 42).This third of four articles discusses the concept of structural and technological well-bottom racks formed by roller cone rock bits and studies the performance of the bits interacting with the well bottom in the process of pure rolling behavior of the cones.Structural rackWe based our theory of the well-bottom rack formation process upon the assumption that each cone began to roll its own sector of the hol...
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