Analysis Of Viscous Energy Consumption In Pumping Machine Well

When using the pumping for crude oil lifting,the downhole oil flowing through the rod pipe annulum will cause pressure loss along the way;When the oil flows through the sucker rod joint coupling and centralizer,local pressure loss will occur.The presence of these pressure losses necessitates an increase in the lift pressure of the pumping pump to lift the crude oil to the wellhead,increasing the energy consumption of the lifting system for the same amount of liquid produced.The energy lost due to friction between lifting liquid and oil pipe,sucker rod,sucker rod joint coupling,centralizer and so on is called viscous energy consumption.Through the theoretical calculation method of fluid mechanics,the friction between the upper and lower stroke sucker rod column and the liquid column,the friction between the liquid column and the oil pipe,and the resistance of the liquid through swimming Ver are theoretically analyzed,and the theoretical calculation formula is derived to determine the pipe diameter,rod diameter,liquid viscosity,rod speed and rod length are the main factors affecting viscous energy consumption.The structure of the screw centralizer is optimized,the optimization goal is to reduce the viscous energy consumption,the numerical simulation method and the response surface method are combined,the PB design screens the main screw centralizer structural parameters affecting the viscous energy consumption,and obtains the optimal centralizer structure based on the response surface method,compared with the initial structure,the pressure loss caused by viscous energy consumption is reduced by 621 Pa,which is reduced by 13.5%.The effects of flow rate and viscosity on the viscous energy consumption caused by liquid flowing through the centralizer were obtained.The finite element model of fluid flowing through the joint coupling of the sucker rod and the empty air of the rod pipe were established,and the viscous energy consumption generated when the liquid flows through the joint coupling and the rod pipe ring was analyzed and simulated.The results show that with the increase of viscosity,the viscous energy consumption generated by liquid flowing through the joint coupling increases.With the increase of viscosity and flow rate,the viscous energy consumption generated by the liquid flowing through the rod tube annulus in the upper and lower strokes also increases.The influence of sucker rod diameter,tubing diameter,sucker rod and tubing eccentricity on the viscosity energy consumption of liquid flowing through the rod pipe annulus was calculated by simulation.In order to improve the accuracy of simulation calculation,the actual working conditions of pumping machine lifting are studied,considering the movement law of the pumping machine and the force deformation of the pumping rod,the functional relationship of the actual motion speed and time of the plunger and the sucker rod is obtained,and the actual motion law of the sucker rod is applied to the fluid boundary by using UDF,and the viscous energy consumption of the rod pipe under the actual motion of the sucker rod is studied.The transient simulation analysis of viscous energy consumption generated by liquid flowing through the centralizer and joint coupling finally obtains the total viscous energy consumption generated by liquid flowing through the centralizer,joint coupling and rod tube ring under actual working conditions when the rod length is 1000 m.The research results of viscous energy consumption analysis in the pumping well can provide a direction for energy saving and consumption reduction of pumping wells,and strongly support the green development of oilfield.