Parameters Optimization And Simplest Control Model Establishment Of Hybrid Energy-saving System In Beam Pumping Unit

With the development of science and technology in the world,people’s demand for petroleum energy has only increased.At present,most of the oil wells that need to be lifted manually rely on rod-type beam pumping units for oil recovery.Beam pumping unit has the advantages of simple structure and stable operation,but its energy consumption in oil production accounts for more than 40% of the total energy consumption in the oilfield.The reason for the serious energy consumption is that the load with high fluctuation rate increases the installed power of motor selection,which leads to the lower load rate and efficiency of motor.According to statistics,the average power factor of the pumping unit motor in a complete working cycle is only 0.448,and the efficiency is less than 50%.Therefore,the serious problems of low load rate and energy consumption of beam pumping units need to be solved urgently.Through reading and analyzing a large number of literatures at home and abroad,the energy-saving means for beam pumping units can be summarized as improving the structure of pumping units,adopting energy-saving driving equipment and adopting energy-saving controller.Among them,since most of the oil fields in China adopt beam pumping units,adjusting the structure of pumping units is not easy to popularize in a wide range in China,and its applicability is weak.Although energy-saving driving equipment and energy-saving controller can play a certain energy-saving effect,but the balance effect of load rate is limited,and cannot effectively suppress the phenomenon of backward generation.Based on the above analysis process,this paper designs a set of auxiliary energy-saving system of beam pumping unit based on Hydraulic Hybrid power.This system can not only promote the use of energy-saving beam pumping units in a large scale throughout the country,but also effectively suppress the phenomenon of backward power generation,and use it to effectively improve the load efficiency and efficiency of the system,so as to achieve significant energy-saving.The research contents of this paper are as follows:Firstly,the basic structure and working principle of the beam pumping unit are analyzed,the geometric relationship of the pumping unit structure is deduced,and the motion law of the donkey head suspension is obtained.Through the analysis and solution of the static and dynamic loads on the suspension,the dynamometer diagram is drawn.Then,the force analysis of the transmission mechanism of the pumping unit is carried out,and the variation law of the crankshaft torque is solved.Taking a certain type of pumping unit as the research object,the structure model is built in Pro/E,and the kinematics and dynamics simulation is carried out by introducing Adams software.The curves of suspension motion and crankshaft torque change of beam pumping unit are obtained,which lays the foundation for the later modeling and simulation.In order to ensure the applicability of the energy-saving system,the parallel hybrid power structure is adopted for the hydraulic energy-saving system.Hydraulic hybrid energy-saving system can collect the potential energy released by the donkey head during the down stroke and release it during the up stroke,which effectively reduces the cycle energy consumption and eases the load fluctuation.The core components of the hydraulic energy-saving system are modeled,and the parameters of the key components of the hybrid power energy-saving system are matched by simulated annealing algorithm according to the initial value and range of variables,taking the lowest energy consumption of the motor as the objective function,and the parameters are optimized preliminarily.According to the energy-saving principle of the hydraulic system and the mathematical model of the key components,the model is established in AMESim,and the load simulation calculation is realized by the combined simulation method of Adams and AMESim.The simulation results show that the parameters matching and optimization effect of the hydraulic energy-saving system is good,the energy-saving effect is remarkable,the equivalent torque of the motor shaft load is effectively reduced,the motor efficiency is greatly improved,and about 25% of the electricity is saved.In order to simplify the input parameters of the control system,improve the reliability of the system and reduce the cost of engineering signal acquisition,the simplest control model is established.Based on the mathematical model of motor energy flow,the genetic algorithm is used to optimize the identification of model parameters,and the theoretical model is built by Simulink.The feasibility of the simplest control model is verified by comparing the experimental data.The simplest control model can simplify the MISO system to SISO system,improve the response speed of the controller and reduce the incidence of system failure.It has great practical significance in engineering.