Research on Coupled Vibration and Control of Flexible Drill Strings
In rotary drilling,the drill rods play an important role in transmitting the torque to help the drill bit break through the rock,and the stick-slip vibration of the drill rods is one of the main reasons for reducing the service life of the drilling equipment and the drilling efficiency,so an effective suppression method was explored by investigating the mechanism of stick-slip vibration.A robust controller based on improved particle swarm-optimized PID parameters was proposed to suppress the stick-slip vibration of the drill bit and keep the other components at the desired speed.A four-degree-of-freedom stick-slip vibration model was adopted,including the rotary table,drill pipe,drill collar,and drill bit,while taking into account the nonlinear interaction of the drill bit in contact with the rock.Matlab/Simulink was used to build a model simulation for numerical analysis,and a simulated drill bit jamming experiment was designed.The results show that the stick-slip phenomenon can cause serious consequences,and the improved particle swarm optimized PID parameters can stabilize the drill bit and other components in the vicinity of the given rotational speed with a control response time of less than 40s,reduce the torque fluctuation of the drill bit,and effectively suppress the stick-slip vibration of the drilling column.
magnetic flux leakage signaldefect identificationpearson correlation coefficientLPSO-BP mode
NETL
NSTL
万方数据
