Research On Flexible Driving Synchronization Theory And Its Application In Shale Shaker

Drilling fluid shale shaker is the key equipment in the solid control system.High density,high viscosity,and oil-based drilling fluids have been widely used given the increase in drilling depth and the development of new drilling technology.Existing shale shaker is difficult to meet the needs of drilling technology.Therefore,developing a novel drilling fluid shale shaker is important in the field of oil and gas drilling engineering.In recent years,domestic and foreign professionals have conducted research on the shale shaker in terms of variable frequency,variable trajectory,intelligence,and other aspects.However,these studies do not substantially improve the dynamic performance of the shale shaker.In addition,shale shakers that use vibration motors encounter insurmountable technical bottlenecks.Thus,a new structural design of the vibration motor is necessary to improve the dynamic performance of shale shakers.The structure of the bilateral flexible drive vibration motor is proposed in the present study.The synchronization theory of the flexible driving vibration system is studied systematically.The validity of the new structure and its design theory is verified by numerical simulation and experiments.The main contents of this paper are as follows.(1)The research status and development trend of shale shaker and its related fields at home and abroad are expounded based on the theory of dynamics and synchronization.The research direction and ideas of this study are introduced based on the fact that a new large exciting force vibration motor should be developed given the high requirements of the performance of shale shakers due to high density,high viscosity,and oil-based drilling fluids.(2)A vibration motor structure,which is driven by the bilateral characteristic of a single motor flexibility,is proposed.It can improve the force condition of the motor itself and the carrier screen box.A dynamic model of a flexible driven eccentric rotor system is established based on this structure.The result of the simulation analysis of the motion response of the system indicates that the bilateral eccentric rotor can achieve synchronous motion state and obtain the synchronous motion law.(3)The dynamic model of the flexible driving vibration system of the single motor is established.Lagrange equation is used to deduce the motion differential equation of the space single-motor flexible drive shaker,as well as the moment balance equation of the vibration generator main axis.The interaction law between the eccentric rotor and vibrating body is revealed.The self-synchronization and stability conditions of the system are deduced using the Hamilton principle.The influencing factors of the synchronous stabilization phase difference of the system are obtained.The self-synchronization and the stability performances of the system are proven using the numerical simulation method.(4)The dynamic model of the double-excited motor flexible drive shale shaker is established.The steady-state response of the vibration system is obtained by solving the motion differential equation of a dual-motor flexible driving vibration system with non-coordinate mass-semidiameter and reverse rotation.The system synchronization and stability conditions are deduced.The relationship between the phase difference angle of the eccentric rotor and the system parameters is obtained through simulation and experimental research.(5)The dynamic model of the rigid and flexible vibration system is proposed.The system synchronization conditions and stability conditions of the vibration system are deduced.The relationships between the phase difference angle and the mass-diameter of the eccentric rotor,the angular velocity of the exciting motor,the torsional rigidity of the elastic coupling,the driving torque and the friction resistance torque of the exciting motor,and the multiple system parameters are obtained.The experimental results show that the synchronous motion of the system is verified by the rigid-flexible hybrid drive shale shaker model.(6)The design and fabrication of the bilateral flexible drive vibration motor prototype are presented.The main dynamic parameters of the flexible drive large-span vibration motor prototype with reverse rotation and dual motor are tested.A three-layer ultra-wide balanced elliptical shale shaker based on the theory of flexible driving synchronization is designed and fabricated,and a preliminary experiment is performed.The accuracy and validity of the flexible driving synchronization theory are verified.By investigating the synchronization theory and the structural and dynamic behavior of the double-sided flexible driving vibration system,the self-synchronization theory and its analytical method of flexible driving and rigid-flexible hybrid driving vibration system are extended.The synchronous motion law of shale shaker based on double-sided flexible driving vibration motor is revealed.This law provides guidance and reference for the development of high-performance shale shakers.The proposed large-span vibration motor can be applied not only to petroleum drilling engineering but can also be extended to shield,mining,and environmental engineering.