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- W3199631418 abstract "Injection of carbon dioxide into shale reservoirs is a promising technology for enhancing natural gas recovery and reducing greenhouse gas emissions. Nanoscale phenomena contribute to a significant difference in mass transfer processes within shale-gas reservoirs compared to conventional gas reservoirs. Previous investigations have shown the significance of surface diffusion to gas transfer mechanisms. Surface diffusion was added to an established apparent permeability model, which was then applied for the first time to numerical reservoir simulations to model CO2 injection techniques. Most publications to date have used a theoretical model to predict surface diffusion coefficient in a low-pressure condition, whereas, in this paper, it has been estimated from gravimetric experiments. Shale reservoirs, with different reservoir and petrophysical properties, were generated to investigate the efficiency of transport of CO2 via surface diffusion. A recently proposed fractal model for surface diffusion was used to investigate the impact of rock surface roughness on CH4 production. The results show that surface diffusion plays a significant role in increasing CH4 recovery by up to 3.2% when the average pore radius is less than 2 nm. In particular, a high surface fractal dimension can potentially enhance CH4 production by up to 1.5% and should not be neglected when the average pore radius is less than 1 nm. In areas with high surface capacity, adsorption of CO2 and desorption of CH4 molecules may increase by up to 2.74% and 2.3%, respectively, when compared to models with no surface diffusion. In all the reservoirs examined, geostatistical reservoir simulations showed that reservoir heterogeneity is not favourable to methane recovery via CO2 injection techniques, except for the Barnett shale reservoir. To the best of our knowledge, this work is the first to implement an apparent model within a reservoir simulator to investigate the impact of surface diffusion on methane recovery via CO2 injection techniques at various shale reservoirs with different properties." @default.
- W3199631418 created "2021-09-27" @default.
- W3199631418 creator A5072516253 @default.
- W3199631418 date "2022-01-01" @default.
- W3199631418 modified "2023-09-26" @default.
- W3199631418 title "Evaluation of impact of surface diffusion on methane recovery via carbon dioxide injection in shale reservoirs" @default.
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- W3199631418 doi "https://doi.org/10.1016/j.fuel.2021.121928" @default.
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