Dynamic Parameter Simulation And Extraction Parameter Optimization Of Carbon Fiber Rod Pumping System

With the continuous extraction of oil,more and more oil fields have entered the middle and late stage of development,and the decrease in formation energy has led to the gradually shifting of crude oil production to deep oil layers.Deepening the pump will bring a series of problems,mainly manifested in: Ultra-long steel sucker rod brings huge load and high torque to the pumping unit;Forces on sucker rod strings in downholes are more complicated;Sudden increase in power consumption of pumping systems;Machine mining efficiency is at a low level,etc.In order to solve this problem,this paper proposes a conventional heavy-duty pumping system using carbon fiber rods and a heavy-duty pumping system under carbon fiber rod pumps on the basis of traditional pumping systems.The carbon fiber rod pumping system can not only deepen the pumping and mining of deep oil well resources,but also reduce the load and torque on the pumping unit to achieve the effect of energy saving.The dynamic parameter simulation model of the carbon fiber rod pumping system is established,and the performance of the pumping system is studied.Mainly carry out the following aspects of work:First,the structural composition of the carbon fiber rod pumping system is analyzed.Focus on the analysis of the structure and working principle of beam pumping units and belt pumping units,establishing the suspension point motion of different types of pumping units;Mechanical properties of carbon fiber sucker rod;Working principle and pump end load of conventional and special suction pumps.Secondly,considering the influence of temperature on the elastic modulus of carbon fiber rods,a mechanical model and a mathematical model for the longitudinal vibration of a hybrid rod and column were established.Using finite element difference method to solve longitudinal vibration model of continuous system,newmark-? method for solving longitudinal vibration model of discrete systems,the steady-state responses of the rod-column node and the pump end under the two methods are analyzed.The hanging point indicator diagram is established,and the simulation results are verified with the measured indicator diagram to obtain the accuracy of the simulation model.Analyze themovement law of the plunger,and accurately obtain the effective stroke of the suction pump plunger.Then,the dynamic parameter simulation model of the entire system is established on the basis of longitudinal vibration,and the performance of steel rod pumping system,carbon fiber rod conventional weighted pumping system and carbon fiber rod pumped pumping system are compared and analyzed.Select the most suitable pumping system.Finally,the pumping system is optimized.With system efficiency as the optimization goal,the appropriate rod and column combination and extraction parameters were selected under specific constraints.The pumping system is simulated,and the pump depth is iterated under the conditions of suspension point load constraints,crank torque constraints,and rod and column strength constraints,and the simulation predicts the deep pumping limit of the pumping equipment.