Multi-directional coupling vibration characteristics of ultra deep horizontal well drilling string considering variable casing diameter
GUO Xiaoqiang1, 2, HU Dongjun1, LEI Zhongqing3, LI Xiang4, LI Xinye1, ZHANG Wenbo1, XIA Chaoqun5
Journal of Vibration and Shock . 2026, (12): 57 -69 . 

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