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• W4205127092 abstract "CO 2 -based fracturing is widely introduced to stimulate shale oil reservoirs for its multiple advantages. However, the range of CO 2 entering the matrix around fractures and CO 2 -oil replacement capacity between matrix and fractures cannot be fully explained. To address this issue, a radial constant volume diffusion experiment on shale cores was designed in this study, and the pressure drop curve history was matched through numerical model to determine the composition effective diffusion coefficient. A field-scale numerical model was established, in which a series of certain grids were used to explicitly characterize fracture and quantify the prosess of CO 2 mass transfer and oil replacement. Based on the field-scale numerical model, the process of shut-in, flow back, and oil production was simulated. The distribution of CO 2 in fractured shale oil formation and its impact on crude oil during shut-in stage and flow back stage were investigated. This study concludes that CO 2 gradually exchanges the oil in matrix into fractures and improve the fluidity of oil in matrix until the component concentrations of the whole reservoir reaches equilibrium during the shut-in process. Finally, about 30∼35 mole % of CO 2 in fractures exchanges for oil in matrix. The range of CO 2 entering the matrix around fractures is only 1.5 m, and oil in matrix beyond this distance will not be affected by CO 2 . During the process of flow back and production, the CO 2 in fracture flows back quickly, but the CO 2 in matrix is keeping dissolved in oil and will not be quickly produced. It is conclued that the longest possible shut-in time is conducive to making full use of the CO 2 -EOR mechanism in fractured shale oil reservoirs. However, due to the pursuit of economic value, a shut-in time of 10 days is the more suitable choice. This work can provide a better understanding of CO 2 mass transfer mechanism in fractured shale oil reservoirs. It also provides a reference for the evaluation of the shut-in time and production management after CO 2 fracturing." @default.
• W4205127092 created "2022-01-26" @default.
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• W4205127092 date "2022-01-03" @default.
• W4205127092 modified "2023-10-17" @default.
• W4205127092 title "CO2 Mass Transfer and Oil Replacement Capacity in Fractured Shale Oil Reservoirs: From Laboratory to Field" @default.
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• W4205127092 doi "https://doi.org/10.3389/feart.2021.794534" @default.
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