Abstract:In drilling field, the undesired stick-slip vibration of a drill string is easily induced, which can damage drilling equipment, reduce drilling efficiency and compromise drilling safety.In order to suppress the undesired stick-slip vibration of the drill string, a control system with a speed compensation feedback controller was proposed.A two degrees of freedom lumped parameter model was established for the drill string system and a nonlinear friction torque model was built for the external disturbance.Based on the 2DOF model, a state observer and a speed compensation feedback controller were designed separately.The feasibility of the control strategy was verified by using MATLAB.The simulation results show that the drill bit speed gradually converges to the input reference value under the action of the designed controller, and the closed-loop control system shows good dynamic performance.The control system was applied in the actual drilling field.The experimental tests demonstrate that the designed control system can effectively suppress the stick-slip vibration of the drill string and it could be implemented in the drilling field.
付蒙,吴亚锋,宋叔飚,李江红,张文龙. 抑制油气井钻柱黏滑振动控制器设计与应用[J]. 振动与冲击, 2019, 38(10): 256-261.
FU Meng, WU Yafeng, SONG Shubiao, LI Jianghong, ZHANG Wenlong. Design and application of a control system to suppress the stick-slip vibration for oil-well drill strings. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(10): 256-261.
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