| 煤体解吸甲烷规律及解吸后微结构特征研究 |
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| 引用本文： | 范家文,刘健. 煤体解吸甲烷规律及解吸后微结构特征研究[J]. 煤炭工程, 2021, 53(2): 147-152. DOI: 10.11799/ce202102029 |
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| 作者姓名： | 范家文 刘健 |
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| 作者单位： | 山西煤炭运销集团晋能煤矿工程公司,山西太原 030031;山西能源学院,山西晋中 030600 |
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| 摘 要： | 在新兴能源产业提质增效的迫切要求下，积极推进煤层气产业发展对于缓解目前国内能源现状具有重要意义。地层应力约束下煤储层吸附解吸瓦斯特征直接关系到瓦斯抽采作业的布置方式。基于此，对应力约束状态下煤体对甲烷的吸附和解吸特征进行了试验研究，同时对解吸甲烷后煤体内部结构特征进行了CT扫描测试和分析。结果表明：煤体对甲烷的吸附量与孔隙压力几乎呈线性关系，符合Langmuir模型|80℃是煤体解吸甲烷较为合理的温度点|解吸甲烷后煤体内部会形成较多孔隙，发育较多的次生裂隙，不同层位孔隙率在6.32%～9.38%之间，平均孔隙度可达7.4%|在不同类别孔隙中，孔径低于30μm的孔裂隙比例高达76.36%|总体上，煤体中孔径较小的孔裂隙结构是甲烷解吸、扩散以及运+移的主要通道。
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| 关 键 词： | 甲烷 等温吸附 解吸率 细观 裂隙 |
| 收稿时间： | 2020-08-10 |
| 修稿时间： | 2020-09-08 |
Study on Microstructure Characteristics of Coal after Desorption and Law of Methane Desorption in Coal |
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| Abstract: | Under the urgent requirement of improving the quality and efficiency of emerging energy industry, it is of great significance to actively promote the development of coalbed methane industry to alleviate the current domestic energy situation. The adsorption and desorption characteristics of coal reservoir constrained by formation stress are directly related to the layout of gas drainage operation. Based on this, this paper carried out an experimental study on the adsorption and desorption characteristics of methane under stress-constrained coal, and also carried out CT scanning test and analysis on the internal structure characteristics of coal after desorption of methane. The results show that: The relationship between the adsorption capacity of methane and pore pressure is almost linear, which accords with Langmuir model. It is considered that 80 ℃ is the reasonable temperature point for coal to desorb methane. After gas desorption, more pores will be formed and more secondary fractures will be developed. The porosity of different layers ranges from 6.32% to 9.38%, with an average porosity of 7.4%. In different types of pores, the proportion of pores and fractures with pore diameter less than 30 μ m is as high as 76.36%. Generally speaking, the pore fracture structure with small pore size is the main channel for methane desorption, diffusion and migration. |
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