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Study on Methane Adsorption in Graphite Slit-pores by Molecular Dynamics Simulation

Lei Chen
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education; School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, People's Republic of China, 710049

Ding-Bin Huang
Key laboratory of Thermal-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University , Xi'an 710049

Shan-You Wang
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education; School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, People's Republic of China, 710049

Ya-Ling He
Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China

Wen-Quan Tao
Key Laboratory of Thermo-Fluid Engineering and Science of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China

DOI: 10.1615/TFEC2017.mnt.017638
pages 2703-2713

要約

Adsorption, desorption and flow of shale gas are important processes in shale gas exploration. The main component of shale gas is methane. So the adsorption of methane in slit was studied by molecular dynamics simulation. In this paper, it has been studied that temperature, pressure, slit width, slit material and water in slits effect on methane adsorption. The methane density difference between bulk phase and interface increases at first, and it will decrease with increasing temperature or pressure. When the slit width is large, it only has a significant influence on the free region size; oppositely, the smaller slit width will decrease the size of adsorption region and the number of adsorption layers. The slit is made of different materials which has significantly different methane adsorption capacity. The methane adsorption capacity is graphite > kaolinite > quartz. Existence of water in slits will reduce methane content. When the moisture content increased up to a certain extent, the surface of slit will be completely covered by water films and the adsorption methane will almost disappear.

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