Molecular Simulation Study on Wettability of Basal Surface of Kaolinite
Kaolinite is a common clay mineral in oil and gas reservoirs,and its wettability is closely related to the recovery rate of oil and gas.In order to study the wettability of kaolinite,Materials Studio software was used to calculate the wettability of hydroxyl surface and silicon oxygen surface of kaolinite at different temperatures through molecular dynamics and Monte Carlo simulation methods.The results showed that a large number of strong hydrogen bonds were formed between the hydrogen atoms in hydroxyl surface and the oxygen atoms in water,making the wettability of hydroxyl surface stronger than that of silicon oxygen surface.The wettability of both hydroxyl surface and silicon oxygen surface decreased with increasing temperature,that is,decreasing temperature could improve the wettability of kaolinite,thereby increasing the recovery rate of oil and gas.
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