Study on the Pseudo-saturation Vapor Pressure of the Methane on Shales

doi:10.11885/j.issn.1674-5086.2015.03.05.07

Abstract

Abstract:

Adsorption of methane on shale is physical adsorption，and methane in supercritical state exists in the shale reservoir.
We introduced a concept of excess adsorption amount to modify adsorption gas volume of the adsorption experiment and
improved the Dubinin Astakhov（D A）equation，which is used to investigate the adsorption characteristics curve of supercritical
methane on shales，and the empirical formula of pseudo-saturation vapor pressure calculation was also investigated. The
result shows that the pseudo-saturation vapor pressure calculated by the Dubinin method and Reid method was lower and the
pseudo-saturation vapor pressure calculated by the extrapolation Antoine equation method and Astakhov method was higher.
The Amankwah method was an optimal method to calculate the pseudo-saturation vapor pressure. The adsorption characteristics
curve of supercritical methane on shales is independent of temperature，and the mathematical expression of adsorption
characteristics curve with physical parameters is described by the improved Dubinin-Astakhov equation.

Key words: shale, CH4, Dubinin Astakhov model, pseudo-saturation vapor pressure, adsorption characteristics curve

Xiong Jian*, Liu Xiangjun, Liang Lixi. Study on the Pseudo-saturation Vapor Pressure of the Methane on Shales[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.03.05.07.

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