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Study on water breakthrough types diagnosis method based on production performance data

CHEN Min-feng,JIANG Han-qiao,ZHAO Chuan-feng (EOR Research Center of China University of Petroleum,Beijing 102249,China)  
Identification of excess water production mechanism can lead to high water plugging success rate.According to theoretical analysis,based on real production performance data,the variance trend of relation curve between oil well water-oil ratio,water-oil ratio derivative and production time is used to identify the reasons of abnormal water breakthrough in oil well.Since there are noise data,e.g.evaluation error,in real production performance data,wavelet transformation method is firstly adopted to denoise the real performance data.Denoised relation curve between oil well water-oil ratio derivative and production time can not only preferably revive the real information contained in production data,but also make gradient positive-negative value clearer. Thus the relation curve between oil well water-oil ratio,water-oil ratio derivative and production time has better fairness and approximation and the oil well water breakthrough diagnosis precision and reliability are improved.Practice proves that this method is simple and reliable.
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