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Abstract
Most of the prolific fields in Niger Delta are increasingly producing water with substantial bypassed oil saturation left unrecovered. The major challenge facing oil and gas industry today is the ability to maximize recovery; reducing the residual oil saturation left trapped after primary and or secondary recovery. Surfactant flooding has been the major process in reducing the interfacial tension between oil and water thereby facilitating the maximum recovery of the residual oil saturation. This study involved using reservoir simulation to show the relative merits of surfactant/polymer flooding in a Niger Delta oil reservoir. The target reservoir was a simple geological model. Despite years of water injection there remains high bypassed oil saturation. The alkaline Surfactant Polymer flooding and the temperature difference between the injecting fluid and the reservoir effects on the EOR flood performance were evaluated. Following nearly two years of water injection and an extensive field polymer injection into four wells, the production response to polymer injection was evaluated and discovered to increase production. Besides, this study presents interactions among the geology, oil saturation distribution and reservoir fluid and flow properties, temperature, and surfactant/polymer concentration. The results of this study will be a major starting point for chemical EOR pilot project in Niger Delta area.
