Analysis Of Lifting Motion Of Carbon Fiber Composite Sucker Rods And Study On Influencing Factors

Carbon fiber composite sucker rods have excellent performance and broad application prospects.Currently,there is no specific technical and theoretical reference for the application design and optimization analysis of pumping parameters of carbon fiber composite sucker rods,and most of them follow the design methods or technical modifications of steel sucker rods.And there is no mature method for dynamic simulation and parameter optimization of oil well lifting process with carbon fiber composite sucker rod string.This directly affects the application effect of carbon fiber sucker rods in oil fields.To address these issues,based on simulation and analysis data,with the goal of achieving energy conservation and consumption reduction in the carbon fiber sucker rod production system,static and dynamic simulation research on oil well lifting with carbon fiber composite sucker rod strings was conducted,and its geometric structure parameters and various performance impact factors were analyzed.The main research contents are as follows:Firstly,the structural composition,material composition,and mechanical properties of fiber composite sucker rods are analyzed to obtain a structural model of the rod string.The method of equivalent composite solid element section to composite beam element section is studied,and a finite element equivalent model of carbon fiber composite sucker rod is established,and the results of the model are verified.Analyze the mathematical model of the longitudinal vibration of the rod string,and analyze the modal natural frequencies and vibration modes of the single stage and multistage sucker rod string.Then,the lifting motion process of carbon fiber composite sucker rods is studied,and the external loads during the lifting process of traditional sucker rods are analyzed.Analyze the damping coefficient of sucker rods and study the calculation method of damping coefficient of concentric sucker rods in laminar flow state.Hypothetical conditions are proposed for the lifting motion process of carbon fiber composite sucker rods in oil wells,and a reasonable simplified stress model of carbon fiber composite sucker rods is obtained,providing a mechanical model basis for the finite element transient dynamic analysis of the lifting motion of composite sucker rods.Secondly,establish a finite element model of carbon fiber composite composite composite sucker rods,set relevant parameters such as boundary conditions,external loads,and damping coefficients,and study the theoretical method of finite element transient dynamics.Based on the research of oil well example parameters,conduct a transient dynamic study of lifting motion on the finite element model of composite sucker rods,and compare and verify the measured data and numerical simulation results.Finally,based on the established transient dynamic model of carbon fiber composite sucker rods and combined with actual well data,the influence of pumping system parameters on the polished rod load and plunger motion law is analyzed.The dynamic viscosity,stroke,stroke,and carbon rod ratio of the produced fluid were analyzed by numerical simulation of the lifting motion of the carbon fiber composite sucker rod string,and the effects of parameter changes on the polished rod load,pump stroke,and rod string vibration of the oil well lifting motion were studied.