Dynamic Simulation Of Positive Displacement Motor Based On Fluid-structure Interaction

Screw drill tool is a displacement down-hole equipment,which consist mostly of bypass valve assembly,motor assembly,cardan shaft and transmission shaft assembly.The main advantages of screw drill tool are the high-speed rotating,the large output torque,smooth,long service life,etc.Therefore,it is widely used in all kinds of engineering in the drilling operation,which is the main drilling tool to the oil industry.Positive Displacement Motor(PDM),also known as the motor assembly,is the core power components of the screw drill tool.It plays role converting hydraulic energy into mechanical energy to implement hydraulic drive.According to the PDM linear theory,the five-lobe motor model with hydraulic drive has been established.The main purpose is to analyze the influence of different parameters on the working performance of the PDM.In the process of establishing simulation model,the friction between stator and rotor,the hyper-elastic rubber bushing,the viscosity of the fluid and contact seal have been taken into account.It has completed the seal chamber transformation,realized the dynamic simulation analysis of the five-blade motor successfully.The paper discussed the work efficiency of the PDM with different interference fit,torque,dropout voltage,to get the results of rotor rotation and revolution period,rubber bushing strain and pressure and the differential pressure of fluid.By analyzing the optimum condition of different working condition,to conclusion regular about how the interference fit,torque and dropout voltage influence the performance of the PDM.