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• W4383102020 abstract "Nanoscale pores are widely developed in tight oil, and the scale effect significantly affects the dynamic behavior of crude oil molecules at different positions in the nanopores. The molecular dynamics simulation method was used to study the mechanism of threshold pressure of tight oil molecules at different positions in quartz and calcite nanopores and the influence of pore radius on threshold pressure. The results show that the mobilizing of crude oil molecules at different positions in nanopores is mainly affected by liquid–solid interactions and intermolecular friction. The interactions between naphthenic acids and pore walls are the main contributing factor to the threshold pressure of boundary crude oil molecules. Van der Waals interaction and weak hydrogen bonds mainly contribute to the bonding of naphthenic acids with quartz walls, and strong electrostatic interaction and strong hydrogen mainly contribute to that with calcite walls. Except for the boundary layer, the threshold pressure of other layers relates to the interactions between saturated hydrocarbon, aromatic hydrocarbon, and adjacent layers as well as the molecular friction, among which friction between the saturated hydrocarbon and the adjacent molecules is dominant. It is challenging for crude oil to mobilize in quartz pores smaller than 3 nm. However, when the quartz pore width exceeds 7 nm, the mobilizing law of crude oil is scarcely affected by the pore width. The mobilizing laws of crude oil differ in calcite pores smaller than 11 nm, while that stays nearly the same in pores larger than 11 nm. Finally, a prediction model for the threshold pressure of tight oil molecules at different positions in quartz and calcite nanopores is proposed, which provides theoretical guidance for precise control of working fluid properties to improve tight oil recovery." @default.
• W4383102020 created "2023-07-05" @default.
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• W4383102020 date "2023-07-04" @default.
• W4383102020 modified "2023-10-18" @default.
• W4383102020 title "Layered Threshold Pressure of Tight Oil in Nanopores: A Molecular Dynamics Simulation Study" @default.
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• W4383102020 doi "https://doi.org/10.1021/acs.energyfuels.3c01255" @default.
• W4383102020 hasPublicationYear "2023" @default.
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