基于谱减算法的声波法测油井动液面的信号处理

在声波法测油井动液面中,由于受到油套环空中各种噪声的影响,得到的液面反射信号异常复杂,使真实的液面反射波位置湮没在液面反射信号中无法辨识。分析了影响声波法测油井动液面的噪声产生原因,利用油套环空中的背景噪声,将谱减法用于声波法测油井动液面的信号处理中,处理后原来反射声波信号中不容易辨识的液面反射波位置可以清楚地显现出来。结果显示,利用谱减法处理油井动液面信号可以消除背景噪声的影响,提高对液面反射波位置的辨识能力,可以得到准确的液面深度值。

Signal Processing in Liquid Level Detection with Acoustic Method Based on Spectral Subtraction

In liquid level detection with acoustic method,the liquid level reflected wave signal was very complex due to the influence of the noises from the annulus between tubing and casing,and the real liquid level was covered which made it difficult to be identified.The reason of noises that influenced the liquid level detection was analyzed,and the spectral subtraction was used to process the liquid level signal.After process with the spectral subtraction,the liquid level which was difficult to be identified was to appear obviously.The result shows that the process of liquid level signal using spectral subtraction can eliminate the influence of background noises,and improve the identification capacity of liquid level to obtain the accurate liquid level value.