The Virtual Prototype Test And Finite Element Analysis Of Beam Pumping Unit

Beam pumping unit is one of mechanical oil extraction equipment, its core working bodies are crank-rocker mechanism. As the horsehead ups and downs just like kowtowing,people call it “kowtow machine”. Beam pumping unit is the part placed on the ground of oil production system, which can pump the oil out from the underground by the cooperation with rod string and subsurface pump. Currently, beam pumping unit accounted for 80% of all machinery production wells, but the overall efficiency is very low. China is one of the countries consume a lot of energy in the world. As the growing shortage of energy, improving and developing energy-saving studies on beam pumping unit has great significance for the energy-saving and improvement of economic efficiency of oil extraction.This paper studied a phased beam pumping unit, analyzed its kinematics and dynamics theoretically, tested the virtual prototype and analyzes with finite element method. Then, this paper optimized the maximum input power of beam pumping unit.Firstly, according to the characteristics of structure and working principle of phased beam pumping unit, the horsehead displacement, speed and acceleration were precisely calculated, and the horsehead load and torque of reducer were discussed, which gives a good theoretical groundwork for the virtual prototype test and finite element analysis in the text below.Secondly, the kinematics and dynamics of beam pumping unit were tested with the virtual prototyping technology by ADAMS2014. And it verified the motion law and the maximum stroke of polished rod with simulation. As well as it tested the force and torque of articulated point between conjoint rods, and found that there were some slight fluctuation,after exploring the reason, we found that it was caused by the two times the working frequency of pumping unit.Thirdly, the static analysis, modal analysis and transient dynamic analysis were conducted for the key components rods of beam pumping unit. The result of static analysis of stent showed that the stress and strain were small and met the working requirements. The result of transient dynamics simulation by the software ANSYS Workbench verified that the equivalent stress and deformation of beam link met the pumping need. The result of modalanalysis showed that the natural frequency of the key components rods and whole machine were all far away from its working frequency, so that the resonance vibration would not take place on the beam pumping unit.Finally, according to the basic principles of the optimal design in structure size for beam pumping unit, this paper selected the maximum input power of the beam pumping unit as the objective function, used the parametric modeling and optimization analysis technology in ADAMS, and got the optimized result of input power of the crank-rocker mechanism of beam pumping unit.