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根据声波在介质中的传播理论和换能器的声学特性，对在套管井中仪器处于不同偏心情况下的超声回波进行了模拟，研究了偏心对超声回波的影响，并进行了实验验证．数字模拟和实验结果表明：仪器偏心不仅会引起回波信号幅度的变化，而且会导致频谱的改变．当偏心大于４ｍｍ时，对回波的影响比较明显；为了保证套管井测井资料的可靠性，仪器偏心应小于３．５ｍｍ．
According to the propagation theory of sound waves in the medium and the acoustic characteristics of the transducers, the ultrasonic echoes under different eccentric conditions are simulated in the cased hole, and the influence of eccentricity on the ultrasonic echo is studied and verified by experiments . Numerical simulation and experimental results show that the eccentricity of the instrument not only causes the amplitude of the echo signal to change, but also leads to the change of spectrum. When the eccentricity is greater than 4mm, the impact on the echo is obvious. In order to ensure the reliability of cased hole logging data, the eccentricity of the instrument should be less than 3.5mm.