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Effects of Acidification on the Wettability Modification of Coal and Adsorption Characteristics of Coalbed Methane

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Abstract

To study the effect of acidification on wettability and adsorption characteristics of coalbed methane (CBM), the anthracite in Guizhou mining area was taken as the research object. X-ray diffraction, Fourier transform infrared spectroscopy, contact angle measurement, and isothermal adsorption experiments were carried out successively. Based on the chemical reaction principle, the main acid was determined. The optimum wettability modification conditions were selected using the CRITIC–gray relational analysis method. Moreover, the evolution law of coal wetting modification and CBM adsorption characteristics under acidification was analyzed. The results showed that the main acid of the testing coal sample was hydrofluoric acid, and the optimum wettability modification condition was an acid concentration of 6% and a reaction time of 12 h. After modification, the coal-water contact angle of the testing coal sample decreased by 20.7%, and its wettability was largely enhanced. In addition, the oxygen-containing functional groups of the modified coal samples increased, alkyl side chains decreased, degree of aromatic condensation and aliphatic chain length decreased to varying degrees, and the adsorption of coal sample on CBM weakened. The results of isothermal adsorption experiments showed that the adsorption constants a and b of the modified coal samples decreased by 14.0 and 23.6%, respectively, which further confirms the correctness of the above analysis. The wettability of the testing coal sample was found to be negatively correlated with its adsorption capacity: better wettability correlated to a weaker adsorption capacity.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 52164014, 52064007, 52064016 and 51864009), and the Guizhou Provincial Science and Technology Projects(Qianke Combination Foundation-ZK[2021]Key 052).

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Authors and Affiliations

  1. School of Mining, Guizhou University, Guiyang, 550025, Guizhou, China

    Rui Zhang, Mei Yuan, Bobo Li, Zhaoping Li & Shiqing Xu

  2. Key Laboratory of Karst Georesources and Environment (Guizhou University) Ministry of Education, Guiyang, 550025, China

    Qing Lv

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  1. Rui Zhang
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Correspondence to Mei Yuan.

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Zhang, R., Yuan, M., Li, B. et al. Effects of Acidification on the Wettability Modification of Coal and Adsorption Characteristics of Coalbed Methane. Nat Resour Res 32, 341–355 (2023). https://doi.org/10.1007/s11053-022-10141-9

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