Modeling And Control Of Suppressing Stick-Slip Vibration Of Drill Rigs And Bit Bounce

In the process of oil exploration and development,there are a wide range of stick-slip vibration and bit bound,which not only decreases the drilling speed,but also wastes the energy,and accelerates the aging and failure of the drill,which seriously threatens the safety of drilling operations.In recent years,foreign scholars have carried out extensive research on the stick-slip vibration and bit bound phenomenon in drilling and obtained corresponding academic achievements.They have even developed a control system for stick-slip vibration and bit bound of oil drilling,and successfully applied in engineering practice.However,domestic research in this field has just started,it is urgent to carry out research on control system modeling and suppression strategies to suppress stick-slip vibration and bit bound.In this paper,the rig movement system is taken as the research object.In view of the stick-slip vibration and the bit bound phenomenon of the system,the research on the model and control strategy of suppressing the stick-slip vibration and bit bound of the drilling rig is carried out.Firstly,from the perspective of dynamics,the mathematical model of the rig movement system is derived,including the rig rotation system,the hoisting system,and the bit-rock interaction model.Secondly,given the initial values of different system parameters.Matlab/Simulink is used to Simulate the dynamic performance of the rig motion system.The experimental results show that the system parameters response curves such as WOB,TOB,d?_b and d are fluctuating sharply,and the stick-slip vibration and the bit bound phenomenon is very serious;Additionally,the rig torsion and axial state feedback controller based on LQR control strategy is designed.The experimental results show that the LQR controller can stabilize the bit speed near?_d and control system response time less than 40s,reducing the fluctuation on WOB,TOB,d?_b and d,effectively suppress the stick-slip vibration and the bit bound phenomenon;Finally,using the WinCC configuration software to establish the virtual monitoring system platform of the rig,and the data parameters of the system simulation model are can be read,writeen,and displayed immediately in the monitoring system,which makes the drilling process visual and intelligent.