Permeability improvement of coal seams by hydraulic fracturing can promote desorption of coalbed methane. However, the water-block effect will restrain desorption of coalbed methane. Based on the essence of the physical adsorption of methane, competitive adsorption, substitution desorption, the capillary effect, and the Jamin effect are analyzed to study the effect of the critical moisture content and liquid water on methane adsorption and desorption. Simultaneously, the effects of the fluid pressure, fracturing fluid, fracturing time, pore pressure, and other variables on methane adsorption and desorption characteristics are analyzed. Then, problems that require further study are described.

中文翻译：

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水力压裂对煤层瓦斯吸附解吸影响研究进展综述

水力压裂提高煤层渗透率可以促进煤层气的解吸。然而，阻水效应会抑制煤层气的解吸。从甲烷物理吸附的本质出发，分析了竞争吸附、置换解吸、毛细管效应和Jamin效应，研究了临界含水量和液态水对甲烷吸附和解吸的影响。同时分析了流体压力、压裂液、压裂时间、孔隙压力等变量对甲烷吸附解吸特性的影响。然后，描述了需要进一步研究的问题。