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The use of tracer methods for studying oil wells makes it possible to determine the efficiency of oil field development. However, the reliability of the results of such studies largely depends on both the correctly selected indicators and the methods of interpretation. The currently developed theory of multiphase filtration and numerical analysis methods make it possible to use appropriate models to interpret the results of using various types of indicators. Of particular interest are mathematical models of processes occurring in oil-saturated rocks when using separable tracers.