The Determination of Shale Gas Absolute Adsorption Basing on Molecular Dynamics Simulation

Authors

  • Wang Xinpeng Yangtze University, Wuhan, 430100, China
  • Guan Fujia Yangtze University, Wuhan, 430100, China
  • Ding Kangle Yangtze University, Jingzhou 434023, Hubei, China
  • Chen Hua Yangtze University, Wuhan, 430100, China

DOI:

https://doi.org/10.15377/2409-787X.2017.04.6

Keywords:

Shale gas, density of adsorbed phase, molecular simulation, absolute adsorption.

Abstract

 The adsorption experimental isotherms developed for excess adsorption of supercritical gases with the appearance of a distinct maximum and quick decrease cannot be explained with the base of the classic adsorption theory developed for absolute adsorption. The key of describing the adsorption of supercritical gases with classical adsorption theory is the correct conversion of the quantity of absolute adsorption and excess adsorption. According to Gibbs definition of adsorption, accurate evaluation of the adsorbed phase density is the key of the correct conversion of the quantity of absolute adsorption and excess adsorption. Based on the principle of molecular dynamics and the application of molecular simulation, it simulates the density of supercritical methane under 0 to 50 MPa, and the calculation results are in accordance with National Institute of Standards and Technology (NIST) data. Based on this, combined with the single molecular adsorption theory, it puts forward a new method of conversion of the quantity of absolute adsorption and excess adsorption that can be applied to a great range of pressure. This method has higher accuracy, and breaks through the existing conversion methods with limit of low pressure conditions.

Author Biographies

Wang Xinpeng, Yangtze University, Wuhan, 430100, China

School of Petroleum Engineering

Guan Fujia, Yangtze University, Wuhan, 430100, China

School of Petroleum Engineering

Ding Kangle, Yangtze University, Jingzhou 434023, Hubei, China

College of Chemistry and Environmental Engineering

Chen Hua, Yangtze University, Wuhan, 430100, China

School of Petroleum Engineering

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Published

2017-12-21

How to Cite

1.
Wang Xinpeng, Guan Fujia, Ding Kangle, Chen Hua. The Determination of Shale Gas Absolute Adsorption Basing on Molecular Dynamics Simulation. Int. J. Petrol. Technol. [Internet]. 2017Dec.21 [cited 2021Sep.25];4(1):33-9. Available from: https://www.avantipublishers.com/jms/index.php/ijpt/article/view/815

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