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• W4387397714 abstract "Carbon dioxide (CO2) enhanced oil recovery (EOR) is an important technology to achieve carbon neutrality by sequestering CO2 underground while simultaneously recovering crude oil. Reservoir pore structure is a key factor influencing CO2 EOR. In this study, we utilized advanced online in situ CT scanning and digital rock techniques to obtain, for the first time, evolution profiles of the finger area during water flooding and CO2 flooding processes, quantitatively assessing the differences in fluid patterns. Additionally, we first introduced an innovative approach using advanced machine learning techniques, especially XGBoost and SHAP, to construct a predictive model of the relative change of oil phase occupancy (RCPOC) based on pore structure parameters and evaluated the importance of each pore structure parameter. Importantly, our results revealed that CO2 can significantly increase the sweep efficiency area while substantially reducing residual oil saturation, in stark contrast to the relatively uniform water front observed during water flooding. Furthermore, we elucidated the critical role of capillary forces, demonstrating that water flooding primarily extracts trapped oil from small pores, while CO2 flooding effectively extracts oil from larger pores. During CO2 flooding, there is a positive correlation between coordination number, mean throat radius (MeanTR), and mean throat length (MeanTL) and the change in oil occupancy, whereas their influence during water flooding is limited. In summary, this study contributes to the understanding of flow patterns and pore structure effects on residual oil during water flooding and the CO2 flooding processes. It also provides a novel approach based on pore structure parameters to predict RCPOC and assess the importance of influencing factors, thereby expanding our research perspective on this issue." @default.
• W4387397714 created "2023-10-07" @default.
• W4387397714 creator A5030308886 @default.
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• W4387397714 date "2023-10-06" @default.
• W4387397714 modified "2023-10-07" @default.
• W4387397714 title "Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO₂ Flooding: In Situ CT Scanning" @default.
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• W4387397714 doi "https://doi.org/10.1021/acs.energyfuels.3c02770" @default.
• W4387397714 hasPublicationYear "2023" @default.
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