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• W2933199729 endingPage "471" @default.
• W2933199729 startingPage "457" @default.
• W2933199729 abstract "Abstract As a potential substitute for the gradually depleted conventional oil and gas resources, shale gas is attracting increasing attention worldwide. Because of the ubiquitous nanopores in shale matrix, studying diffusion behavior of shale gas in nano-scale channels is crucial for its development, which also lays the foundation for the optimization of hydraulic fracturing, horizontal well spacing, etc. This paper focuses on shale gas diffusion behavior in organic-rich nano-slits and establishes a calculation method for generalized transport diffusivity using Darken approximation by molecular simulation (MS). The main conclusions are as follows. (1) For the whole gas, compared to its self-diffusivity which decreases monotonically with pressure, there is a break point for its transport diffusivity in each slit. It’s found that the sequence of magnitudes of transport diffusivities in different pores at low pressures and that at high pressures are contrary. (2) For the bulk district (BD) in 2 nm slit, the self- and transport diffusivities don’t differ much at low pressures and their discrepancy enlarges at high pressures, the deviation of which can be 2.34 times at 41 MPa. (3) The transport diffusivity of the molecules in the Knudsen layer (KL) in 2 nm slit is always larger (1.21–3.76 times) than their self-diffusivity and shows fluctuations at large pressures, other than the self-diffusivity in KL which decreases monotonically with pressure. Furthermore, the deficiencies and directions for improvements of the kinetic self-diffusion model and Knudsen diffusion model are analyzed by the data comparison and the theory background on their derivation and expressions. It is expected that this work will give new insights on the flow capacity of shale gas in nano-scale pores and contribute to a deeper understanding for shale gas evaluation and exploitation." @default.
• W2933199729 created "2019-04-11" @default.
• W2933199729 creator A5004143556 @default.
• W2933199729 creator A5008464868 @default.
• W2933199729 creator A5017360261 @default.
• W2933199729 creator A5076702481 @default.
• W2933199729 creator A5088470915 @default.
• W2933199729 creator A5090710098 @default.
• W2933199729 date "2019-08-01" @default.
• W2933199729 modified "2023-09-29" @default.
• W2933199729 title "The general form of transport diffusivity of shale gas in organic-rich nano-slits—A molecular simulation study using Darken approximation" @default.
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