The calculation method proposed in this series, using actual gear ratio for the cones, allows the designer to determine and optimize kinematic parameters of drill bits, the analysis is applicable to both steel tooth and tungsten carbide insert bits. This final part of this four-part series will discuss the performance of a modified roller cone bit in the Tatneft OSC oil fields as compared with other bits. Earlier parts of this series covered roller cone bit design analysis widi teeth of equal and varied pitch, and the interaction of bits with the well bottom during pure rolling.
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