نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه صنعتی سهند
2 عضو هیات علمی دانشکده مهندسی نفت و گاز دانشگاه صنعتی سهند
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
One of the leading challenges in developing heavy oil fields through water-based injection methods is early production of injected water and insufficient oil production. This event can result from unfavorable conditions of mobility, which is aggravated by the heterogeneity of the reservoir. In such a situation, polymer injection can provide a favorable potential for improving water-based injection methods. In this study, an analytical model has been developed to quickly predict the flow behavior of polymer solution at the core (fine) and reservoir scales. To achieve this goal, first, an analytical model based on the Buckley-Leveret theory at the core scale was presented to design polymer flooding and to investigate the influence of the governing mechanisms on increasing oil recovery. Then, at the reservoir scale, the effect of heterogeneity in the form of the Koval parameter and the effect of salinity (seawater salinity and its diluted conditions) on the performance of the polymer injection methods were considered. According to the core scale results, polymer injection led to a 7% increase in oil recovery compared to seawater injection. In heterogeneous reservoir conditions, this positive performance was more significant and led to 12% additional oil production compared to seawater. Regarding the effect of salinity, the obtained results showed the synergism of the low-salinity polymer flood method in such a way that, in the core and reservoir conditions, oil production was 12 and 4 percentages higher than that of polymer injection. The developed analytical model is a suitable tool for designing the polymer flood process in different conditions of salinity and heterogeneity, which can be used to facilitate technical and economic decisions at the reservoir scale.
کلیدواژهها [English]
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