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近几年,随着电子技术的发展和油田中后期寻找剩余油分布的需要,过套管电阻率测井作为一种新技术迅速发展起来。该技术在套后剩余油监测、老井挖潜、油层水淹规律确定、油层生产动态监测等方面具有独特的优势,并取得了较好的应用效果。但在采集过程中其有效信号为纳伏级,套管、测量频率、测量电极距、水泥环、套管非均质性等都会使测量信号发生严重的畸变,在过套管电阻率资料预处理中必须对这些因素进行校正。本文针对俄罗斯ECOS-31-7过套管测井资料特点,分析了原始离散数据筛选方法、离散数据插值原则,探讨了套管非均质性、水泥环及固井质量校正方法。对实际过套管测井原始资料的处理效果表明,该处理方法有效可行。
In recent years, with the development of electronic technology and the need to find the remaining oil distribution in the middle and late stages of the oilfield, CST resistivity logging has developed rapidly as a new technology. The technique has unique advantages in post-casing residual oil monitoring, tapping the potential of old wells, determining the law of oil-water flooding and dynamic monitoring of oil production and has achieved good application results. However, the effective signal in the acquisition process for the nanovolt level, the casing, measuring frequency, measuring electrode distance, cement ring, casing heterogeneity will make the measurement signal serious distortion, over the casing resistivity data pre- These factors must be corrected in the process. In this paper, according to the characteristics of ECOS-31-7 over-cased logging data in Russia, the original discrete data screening method and discrete data interpolation principle are analyzed. The casing anisotropy, the cement ring and the cementing quality correction method are discussed. The treatment effect on the actual data of casing logging indicates that the treatment method is effective and feasible.