Abstract
Most coal reservoirs show high gas content with relatively low desorption efficiency, which restricts the efficiency of coalbed methane (CBM) extraction and single-well productivity. This review highlights the desorption hysteresis mechanism and its controlling factors as well as methods and models to reveal desorption hysteresis and potential solutions. Methane adsorption and desorption can be recorded by both gravimetric and volumetric experiments. Although different adsorption models are used, desorption is generally considered with the Langmuir model. Desorption hysteresis is influenced by the petrophysical composition, thermal maturity, pore structure distribution of the coal, reservoir temperature, and moisture and water content. Methods for calculating desorption hysteresis include the area index, hysteresis index and introduction of a hysteresis factor and a hysteresis coefficient. Molecular dynamics simulations of methane desorption are mainly based on theories of kinetics, thermodynamics, and potential energy. The interaction forces operating among coal, water, and methane molecules can be calculated from microscopic intermolecular forces (van der Waals forces). The desorption hysteresis mechanism and desorption process still lack quantitative probe methodologies, and future research should focus on coal wettability under the constraints of liquid content, potential energy adjustment mechanism, and quantitative analysis of methane desorption rates. Further research is expected to reveal the desorption kinetics of methane through the use of the solid-liquid-gas three-phase coupling theory associated with the quantitative analysis of methane desorption hysteresis, thereby enhancing the recovery rate and efficiency of CBM wells.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (Grant Nos. 42072194 and U1910205), and the Fundamental Research Funds for the Central Universities (Nos. 800015Z1190 and 2021YJSDC02). We thank for Dr. Yong Li for his help in conducting a careful proof reading for our manuscript.
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Xu, W., Li, J., Wu, X. et al. Desorption hysteresis of coalbed methane and its controlling factors: a brief review. Front. Earth Sci. 15, 224–236 (2021). https://doi.org/10.1007/s11707-021-0910-0
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DOI: https://doi.org/10.1007/s11707-021-0910-0