Petroleum Reservoir Evaluation and Development >

2022 , Vol. 12 >Issue 4: 556 - 563

DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2022.04.002

Methodological and Theory

Experimental study on interfacial interaction between methane and vitrinite and durain: A case study of bituminous coal in Minhe Basin

  • Dongmin MA ,
  • Xin WANG ,
  • Jinxiang TENG ,
  • Changjiang JI ,
  • Kai SHAO ,
  • Chao ZHENG ,
  • Yusong JI ,
  • Peng HUI
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  • 1. College of Geology and Environment, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China
    2. Key Laboratory of Coal and Coalbed Methane Co-mining Technology, Jin cheng, Shanxi 048000, China
    3. Shaanxi Coalbed Methane Development Corp., Ltd., Xi’an, Shaanxi 710065, China

Received date: 2022-04-12

  Online published: 2022-09-02

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Abstract

In order to study the differences in the adsorption/desorption characteristics of methane between the gelification and fusinization in the bituminous coal, the 2# coal seam of the Haishiwan Coal Mine in Minhe Basin is collected as the research object. By using the Langmuir fitting and dual-site Langmuir fitting on the experimental data of isothermal adsorption/desorption respectively, the adsorption thermodynamic characteristics of different fugacity environments are analyzed by calculating the isosteric adsorption heat, and the influence of maceral difference on coalbed methane production is discussed. The results show that: ①The adsorption of methane on the gelification and fusinization in coal accords with the Langmuir function, and the fitting degree is higher than 0.99. The adsorption capacity of the gelification is much higher than that of the fusinization. ②At the same temperature point, there is desorption lag phenomenon in both granular coal and pillar coal, which is due to the difference of adsorption heat. The fitting results of granular coal experiment are larger than those of lump coal experiment. ③The equivalent adsorption heat increases with the increase of fugacity and decreases with the increase of temperature. The influence of adsorption phase density on the equivalent adsorption heat is greater than that of temperature, leading to the adsorption of methane molecules with greater kinetic energy on the coal surface. The equivalent adsorption heat decreases with the increase of temperature as a whole. ④The adsorption capacity of different components of coal is quite different, and areas with high vitrain content should be the first choice for CBM well location deployment.

Key words： gelification; fusinization; adsorption/desorption; isosteric adsorption heat; Haishiwan Coal Mine

Cite this article

Dongmin MA , Xin WANG , Jinxiang TENG , Changjiang JI , Kai SHAO , Chao ZHENG , Yusong JI , Peng HUI . Experimental study on interfacial interaction between methane and vitrinite and durain: A case study of bituminous coal in Minhe Basin[J]. Petroleum Reservoir Evaluation and Development, 2022 , 12(4) : 556 -563 . DOI: 10.13809/j.cnki.cn32-1825/te.2022.04.002

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