Research of CO<inf>2</inf> and N<inf>2</inf> Adsorption Behavior in K-Illite Slit Pores by GCMC Method
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Understanding the adsorption mechanisms of CO2 and N2 in illite, one of the main components of clay in shale, is important to improve the precision of the shale gas exploration and development. We investigated the adsorption mechanisms of CO2 and N2 in K-illite with varying pore sizes at the temperature of 333, 363 and 393 K over a broad range of pressures up to 30 MPa using the grand canonical Monte Carlo (GCMC) simulation method. The simulation system is proved to be reasonable and suitable through the discussion of the impact of cation dynamics and pore wall thickness. The simulation results of the excess adsorption amount, expressed per unit surface area of illite, is in general consistency with published experimental results. It is found that the sorption potential overlaps in micropores, leading to a decreasing excess adsorption amount with the increase of pore size at low pressure, and a reverse trend at high pressure. The excess adsorption amount increases with increasing pressure to a maximum and then decreases with further increase in the pressure, and the decreasing amount is found to increase with the increasing pore size. For pores with size greater larger thaN2 nm, the overlap effect disappears.
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Al Hinai, Adnan Saif Hamed; Rezaee, M. Reza (2015)Assessing shale formations is a major challenge in the oil and gas industry. The complexities are mainly due to the ultra-low permeability, the presence of a high percentage of clay, and the heterogeneity of the formation. ...
Chen, G.; Zhang, J.; Lu, S.; Pervukhina, Marina; Liu, K.; Xue, Q.; Tian, H.; Tian, S.; Li, J.; Clennell, M.; Dewhurst, D. (2016)© 2016 American Chemical Society.The adsorption of hydrocarbon (pure CH4 and C2H6) on illitic clay was investigated at temperatures of 333, 363, and 393 K (60, 90, and 120°C) over a range of pressures up to 30 MPa using ...
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