Abstract
Abstract This paper presents two new methods to analyze remaining oil distribution in high-water-cut reservoir by modern well test interpretations of water injection wells and water breakthrough producers. For water injected wells, after the pressure transient behavior of two phase simultaneous flow in a water injection area is investigated the pseudo skin factor resulted from the two phase flow is determined. Oil/water relative permeability curve can be determined from the factor, combined with mobility from falloff test analysis, then remaining oil distribution can be determined. For waterbrteakthrough producers, mathematical models of flooding reservoir and their resolution are presented by approximated method of composite reservoir with multiple movable fluid interfaces. An artificial neural network was also build up to get relative permeability curve from well-test data. The two methods are examined by software to get oil distribution in large scale of whole oil field. P. 241
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