Li Xinye,Zhang Wenbo,Guo Xiaoqiang,et al.LQR control of axial⁃torsional bidirectional vibration of drill string in oil and gas wells[J].China Petroleum Machinery,2025,53(10):86-95.
Li Xinye,Zhang Wenbo,Guo Xiaoqiang,et al.LQR control of axial⁃torsional bidirectional vibration of drill string in oil and gas wells[J].China Petroleum Machinery,2025,53(10):86-95.DOI: 10.12473/CPM.202407048.
LQR Control of Axial-Torsional Bidirectional Vibration of Drill String in Oil and Gas Wells
To effectively solve the failure problem induced by axial-torsional bidirectional vibration of drill string, with the help of the 3-DOF dynamics model of drill pipe, a simulation study was performed on the suppression of linear quadratic regulator (LQR) control on the axial vibration and torsional vibration of drill string. First, based on the LQR control strategy, torsional and axial feedback controllers were designed. Second, the influences of working parameters on the response of the system were simulated under four conditions (without feedback controller, with only torsional feedback controller, with only axial feedback controller, and with both torsional and axial feedback controllers). Finally, the simulation results of LQR control and top drive control were compared. The results show that the stick slip of drill string and bounce of bit are effectively suppressed only when both axial and torsional feedback controllers are applied. The axial-torsional feedback controller designed based on the LQR control strategy is better performed than the top drive control. The study results provide theoretical reference for investigating the vibration control of drill string.
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