Abstract:The compound drilling plays an important role in improving borehole quality. The modal analysis model of drillstring is established to analyze the modal of longitudinal vibration, lateral vibration and torsional vibration, respectively. Compared with longitudinal and torsional vibrations, the intrinsic frequency range of lateral vibration are smaller, and it is harder to prevent resonance by adjusting critical rotation speed in case of lateral vibration. The intrinsic frequency of drillstring decreases as dril… Show more
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