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Detection signal treatment for stress and magnetic memory of downhole metal casing

LI Jin-wang1,2,LIU Qing-xi2,LIU Wen-jian1,CHEN Mao-long2 (1.Navigation and Space Navigation Manufacturing Engineering Institute,Harbin University of Technology,Harbin 150000,China;2.Logging & Testing Service Company of Daqing Oilfield Company Ltd.,Daqing 163412,China)  
By the reason of geology and engineering,downhole casing is affected on heterogeneous load easily generates plastic deformation.Metal magnetic memory testing technique can effectively distinguish stress concentration zone of casing,which can develop early diagnose for casing damage.Downhole interference and noise has serious effects on metal magnetic memory test data, thus treatment and analysis techniques for magnetic memory signal are technical key and difficulty for magnetic memory method testing and evaluating downhole metal casing stress.In actual testing,magnetic memory signal belongs to random signal without stationarity,adjusting adopting wavelet technique to analyze magnetic memory signal.This paper introduces wavelet denoising treatment method in quantitative analysis and adopts several relative techniques including Db4 wavelet function,resolving layers,signal and digital filtering and signal inversion.This method effectively eliminates various noisy interferences.Based on magnetic memory signal after treatment,force site of casing can accurately be analyzed and determined.
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