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CLASSIC BIT KINEMATICS—1: Design analysis predicts cone behavior

02/04/2008
Drillbit kinematics are defined by the rotation speed and rate of penetration, influenced by the cutting action of the teeth. Each cone of a conventional roller cone bit has several rows of teeth; row placement and tooth pitch may differ for each cone.Rock drillbit design involves selecting the cone geometry and the shape and layout of the cutting structures. The cone design predetermines the kinematics of the cutting structure and the bottomhole interaction, which subsequently defines the drilling process efficiency and the bit’s susceptibility to wear. Peculiarities of cone bit kinematics determine the cone’s gear ratio value, which sets the magnitude of the cutting structur...
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