CAJ | 학술논문

为了检测油井动液面深度，采用FFT方法对动液面信号进行频谱分析，根据其结果设计滤波器，得到较平滑的动液面波。为了进一步提高检测效果与精度，引入小波去噪方法对动液面信号处理，分别采用软阈值与硬阈值方法对其进行降噪处理，并与FFT方法对比，通过SNR和RMSE的定量分析表明，小波去噪方法在SNR和RMSE方面都优于FFT方法，具有更好的降噪效果。
위료검측유정동액면심도，채용FFT방법대동액면신호진행빈보분석，근거기결과설계려파기，득도교평활적동액면파。위료진일보제고검측효과여정도，인입소파거조방법대동액면신호처리，분별채용연역치여경역치방법대기진행강조처리，병여FFT방법대비，통과SNR화RMSE적정량분석표명，소파거조방법재SNR화RMSE방면도우우FFT방법，구유경호적강조효과。
In order to monitor oil well’ s dynamic liquid level, the FFT method was adopted in the dynamic liquid level frequency spectrum analysis and then basing on the analytical result, a filter was designed;and in view to improving both monitoring effect and accuracy, the wavelet de-noising method was introduced to process dynamic liquid level signals and both soft and hard threshold methods were applied in this operation. Comparing the wavelet de-nosing with FFT method in SNR and RMSE quantitative analysis shows that the wavelet de-nosing outperforms the FFT method because of its better de-nosing effect.