Pore structure of low‑permeability coal and its deformation characteristics during the adsorption–desorption of CH4/N2
作者机构：College of Safety Science and EngineeringSchool of Safety Science and EngineeringXi’an University of Science and Technology58Yanta Mid.Rd.Xi’an 710054ShaanxiChina Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of EducationXi’an University of Science and TechnologyXi’an 710054ShaanxiChina Western Engineering Research Centre of Mine Gas Intelligent Drainage for Coal IndustryXi’an 710054ShaanxiChina
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2023年第10卷第4期
页 面：107-127页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
基 金：supported by the Natural Science Foundation of China(51874236 and 52174207) Shaanxi Provincial Department of Science and Technology(2020JC-48 and 2022TD-02) China Postdoctoral Science Foundation(2021M693879)
主 题：Low-permeability coal Pore structure Adsorption–desorption Deformation characteristics Strain model
摘 要：The pore structure of coal plays a key role in controlling the storage and migration of CH4/*** pore structure of coal is an important indicator to measure the gas extraction capability and the gas displacement efect of N2 *** deformation characteristic of coal during adsorption–desorption of CH4/N2 is an important factor afecting CH4 pumpability and N2 *** pore structure characteristics of low-permeability coal were obtained by fuid intrusion method and photoelectric radiation *** multistage and connectivity of coal pores were ***,a simultaneous test experiment of CH4/N2 adsorption–desorption and coal deformation was carried *** deformation characteristics of coal were clarifed and a coal strain model was ***,the applicability of low-permeability coal to N2 injection for CH4 displacement technology was *** results show that the micropores and transition pores of coal samples are relatively *** pore morphology of coal is dominated by semi-open *** pore structure of coal is highly complex and *** pores,mesopores and macropores of coal have good connectivity,while micropores have poor *** constant triaxial stress,the adsorption capacity of the coal for CH4 is greater than that for N2,and the deformation capacity of the coal for CH4 adsorption is greater than that for N2 *** axial strain,circumferential strain,and volumetric strain during the entire process of CH4 and N2 adsorption/desorption in the coal can be divided into three *** adsorption–desorption deformation has the characteristics of anisotropy and gas-diference.A strain model for the adsorption–desorption of CH4/N2 from coal was established by considering the expansion stress of adsorbed gas on the coal matrix,the compression stress of free gas on the coal matrix,and the expansion stress of free gas on micropore fractures.N2 has good injectability in
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