Simulation of Methane Adsorption of Quartz with Different Wettability

doi:10.11885/j.issn.1674-5086.2019.09.16.11

Abstract

Abstract: As one of the important basic parameters of reservoir rocks, wettability's characteristics directly affect the micro and macro distribution characteristics of fluids in rock pores. Understanding the interaction between shale gas and minerals at the micro-level is the basis of understanding the state occurrence of shale gas. Molecular simulation was used to study the adsorption of methane in different conditions of modified quartz, and different crystal faces and wettability were studied. The conclusions of the study are as follows. In different crystal-faces models, the adsorption capacity of (100) surface is greater than that of the other models. The adsorption of methane in the modified oil-philic model is larger than that in the modified water-philic model. The adsorption of methane in different wettability modification models increases with the increase of pressure, and decreases with the increase of temperature, and the effect of temperature is less than that of aperture. Under the same conditions, the adsorption capacities of the modified models are much larger than that of the unmodified model. In the 1 nm modified models, an adsorption layer is formed at the wall surface, while multiple adsorption layers are formed in 2 nm modified models.

Key words: methane, quartz, wettability, adsorption, molecular simulation

CLC Number:

TE319

WANG Zhouhua, ZHAO Jianfei, BAI Yin, GUO Ping, LIU Huang. Simulation of Methane Adsorption of Quartz with Different Wettability[J]. 西南石油大学学报(自然科学版), 2019, 41(6): 28-34.

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