Study On Temperature Pressure Coupling Analysis And Structural Parameter Optimization Design Of Metal Screw Pump

At this stage,the stator lining of the traditional screw pump is made of rubber material,which is usually hung on the inner wall of the metal stator,and its profile is a double spiral surface matched with the metal stator.In the working state,the swelling,temperature expansion and easy aging of rubber materials will reduce the service life of stator.For the repair work after the stator is damaged,the oil pipe,rod column and pipe column connected with the stator must be reopened,the cost is very high,and the stator rubber vulcanized on the inner wall is not easy to remove,resulting in a waste of resources.All metal single screw pump can overcome the above shortcomings,but the development of all metal screw pump is relatively late,the theoretical research is relatively few,and the basic theory is not mature.The design of some pump parameters only depends on some empirical values or a small amount of test data,which seriously limits the application of all metal screw pump.And with the deepening of oil well depth,the difficulty of oil production is also increasing.Deep well and ultra deep well oil production is also an essential part.For the metal screw pump under the multifield coupling of pressure field,temperature field and other flow fields in deep wells,the influence of the deformation of metal parts under high temperature and high pressure on its pump efficiency is worthy of attention.Therefore,aiming at the above problems,this paper studies and analyzes the metal screw pump combined with the numerical simulation method.The main contents are as follows:For the all metal single screw pump,firstly,the stator and rotor profile equation is deduced,the motion law is explored,the displacement equation under the clearance matching mode is deduced,the parameter formula of leakage and the optimal clearance with the goal of minimum power loss are deduced by using the simplified model,and the parameters affecting the pump performance are given semi quantitatively.Based on the structural parameters of glb500 metal screw pump,the calculation model is constructed.The difference between the overlapping grid method and the traditional dynamic grid method is discussed.The best scheme is selected,and the finite element model for flow field analysis is established.Compared with the Gamboa test data,the correctness of the finite element model is verified.Through numerical simulation,the characteristics of the internal flow field of the all metal single screw pump and the effects of parameters such as clearance,speed and medium viscosity on the pump performance are analyzed,and the factors that have a great impact on the stability and performance of the internal flow field of the pump are summarized.The influence of downhole high temperature and high pressure on the change of stator and rotor clearance is analyzed and calculated by using the finite element software ANSYS,and the pump parameters are optimized and improved based on the change of pump parameters under actual working conditions.The improved pump is numerically simulated and compared with that before the improvement.The accuracy of the optimization results is verified by data analysis.