One of the important parameters in capacitance-resistive model (CRM) for the prediction of production performance is fij, representing the fraction of injection rate of injector i flowing toward producer j. However fij was usually assigned to unity when a reservoir is represented by a single producer and a single injector as a tank. We found that this might not be true in many cases. In this study, the above assumption of unity fij was relaxed in the case of lump reservoir model (tank model). Another problem in applying CRM is the poor accuracy of the match and prediction of oil production. In this study we modified the CRM for matching and predicting oil production with greater accuracy than the existing fractional flow model. Production data from chosen oil reservoirs were analyzed using both existing and modified approaches and the results were compared. The results showed that the modified CRM approach could fit the production performance better than the existing CRM in many cases. This study demonstrated that the assumption of unity fij could be removed in the case of lump reservoir model. The physical significance behind this was proposed and explained. The results and analysis demonstrated that the accuracy of the modified oil production model was significantly greater than the existing fractional flow model in many cases.

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