Research On Axial Force Of Oil Production Device Of Asymmetric Parallel Screw Pump

With the rapid development of the petroleum industry,the electric submersible progressing cavity pump production system as rodless production equipment occupies an important position in the field of oil production with its unique advantages.And it has become the main oil production equipment of high viscosity and high sand content oil Wells.However,with the continuous development of domestic oil fields,increasing depth and medium temperature,the development of the electric submersible progressing cavity pump production system is facing great challenges.The screw pump oil production technology was developed late in our country,so how to improve the submersible depth and service life of the screw pump has become a domestic research focus.The practical application shows that the service life of the bearing in the thrust coupling is an important factor that restricts the service life of the oil production system.In order to prolong the service life of bearings,this thesis takes the production device of asymmetric parallel screw pump as the research object,adopts the method of combining theoretical analysis and numerical simulation to study the axial force generation of the oil production device,and provides theoretical support for the subsequent innovative design of screw pump.In this thesis,the new structure and working principle of the oil production device of the asymmetric parallel screw pump are described systematically.The motion law of the rotor in the stator bushing is analyzed from the kinematic point of view,and the influencing factors of the axial force of the screw pump are determined.The calculation formula of axial force produced by the production device is established,and the principle of selecting two pumps for the production device of the asymmetric parallel screw pump is given.Through the calculation of an example,it is proved that this configuration of screw pump can effectively reduce the axial force of the production device and prolong the service life of the system under the same displacement.The geometrical model of the fixed rotor of the progressing cavity pump is constructed by using the three-dimensional software,and the thermodynamic coupling simulation analysis is carried out to study the influence of interference,medium temperature and pump end pressure difference on the axial force of the progressing cavity pump,and the influence degree of the three is obtained according to the orthogonal test design.The regression equation of axial force calculation using three factors is obtained by regression model.Finally,aiming at the problem of axial force measurement of screw pump,design a screw pump axial force measurement scheme,including the experimental principle,the selection of experimental equipment and screw pump axial force measurement scheme.The calculation formula of axial force of screw pump is obtained from the above work.The pump selection principle of the production device of asymmetric parallel screw pump is determined.The influence of interference,medium temperature and pump end pressure difference on axial force of screw pump is obtained by finite element simulation.The influence degree of three factors on axial force is obtained by orthogonal test.The design of axial force measurement scheme of oil production device of screw pump with asymmetric parallel structure is completed.