超声波泥浆密度在线检测系统研究

发布时间：2018-04-09 11:45

本文选题：超声波衰减　切入点：有限元仿真　出处：《沈阳工业大学》2015年硕士论文

【摘要】：本文是关于泥浆密度在线检测系统的研究。泥浆密度测量在钻井工程中占有举足轻重的位置。通过分析可知泥浆特性参数等因素对泥浆密度检测会产生不同程度的影响，研究影响因素变化对超声波衰减特性的影响，对实际应用中提高泥浆密度检测精度提供了理论依据。针对泥浆密度检测的问题，本课题在超声波传播理论基础上，首先基于超声波衰减法对泥浆密度检测原理进行了研究，并建立了声衰减系数与泥浆特性参数的关系。理论研究可知，超声波信号在泥浆中传输衰减系数与泥浆密度、泥浆粘度、泥浆温度、泥浆流速、泥浆压力和超声波本身频率等因素有关。基于有限元软件COMSOL Multiphysics模拟仿真了在不同影响因素下超声波在泥浆中传播特性，分析在不同参数情况下超声波衰减率的变化，并拟合出相应的关系曲线，，归纳总结出理论结论，为有效完成超声波泥浆密度检测提供理论依据。最后设计了一套用以测试超声波信号在泥浆中传播特性的地面模拟实验系统，搭建了硬件系统实验平台，并对其进行调试。在实验条件下，测量了在不同泥浆密度、温度、压力、流速和不同超声频率下超声波回波信号幅值。研究表明：泥浆的特性参数（如密度、粘度、流速、压力和温度）和超声波换能器的本征频率对超声波信号传输有着重要的影响，且实验结果与仿真模拟得到的结论趋势一致。
[Abstract]:This paper is about the research of mud density online detection system.Mud density measurement plays an important role in drilling engineering.Through the analysis, we can know that the mud characteristic parameter and other factors will have different influence on the mud density detection, study the influence of the influence factor change on the ultrasonic attenuation characteristic, and provide the theoretical basis for improving the mud density detection precision in the practical application.Based on the theory of ultrasonic wave propagation, the principle of mud density detection is studied based on ultrasonic attenuation method, and the relationship between acoustic attenuation coefficient and mud characteristic parameters is established.Theoretical study shows that the attenuation coefficient of ultrasonic signal transmission in mud is related to mud density, mud viscosity, mud temperature, mud velocity, mud pressure and ultrasonic frequency.Based on the finite element software COMSOL Multiphysics, the characteristics of ultrasonic wave propagation in mud under different influence factors are simulated, and the variation of ultrasonic attenuation rate under different parameters is analyzed, and the corresponding relationship curve is fitted out, and the theoretical conclusions are summarized.It provides theoretical basis for ultrasonic mud density measurement.At last, a ground simulation experiment system is designed to test the propagation characteristics of ultrasonic signal in mud. The hardware system experiment platform is built and debugged.The amplitude of ultrasonic echo signal at different mud density, temperature, pressure, flow rate and ultrasonic frequency was measured under experimental conditions.The results show that the characteristic parameters (such as density, viscosity, flow rate, pressure and temperature) and the intrinsic frequency of ultrasonic transducer have important influence on the ultrasonic signal transmission, and the experimental results are consistent with the simulation results.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE256.7

【参考文献】