油井环空套管声传播特性研究

Study on the sound propagation characteristics of annular casing in oil well

在油井环空套管这个特殊的传输路径中,由于多途径反射、衰减、噪声干扰等复杂因素的影响,使得声波的传输信道情况复杂。本文通过对理想状态下线性波动方程和粘滞非线性波动方程的分析研究,发现在白噪声和粉红噪声影响下建立系统的仿真模型更利于抽油系统诊断和分析井下工作情况。最后通过对声波在环空套管内的传播特性进行分析,发现在考虑到接箍等其他因素的影响,频率越低的声波越适用于作为测井的探测声波。

The transmission channel of sound wave was complex in the special transmission path of oil well annular casing, due to the influence of many complex factors such as reflection, attenuation and noise interference. In this article, the linear viscous wave equation and nonlinear wave equation were researched under the ideal station. Furthermore, the propagation characteristics of acoustic wave were analyzed in the annular casing. Results showed that the simulation model, which was established with the influence of white noise and pink noise, was more conducive to the diagnosis and analysis of the oil pumping system. Besides, the sound wave with lower frequency was more suitable for detection of oil wells in considering some influence factors, such as the coupling.