| 注CO2置换/驱替煤中甲烷定量化研究 |
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| 引用本文： | 杨宏民,,许东亮,陈立伟,.注CO2置换/驱替煤中甲烷定量化研究[J].中国安全生产科学技术,2016,12(5):38-42. |
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| 作者姓名： | 杨宏民 许东亮 陈立伟 |
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| 作者单位： | （1.河南理工大学 安全科学与工程学院，河南 焦作 454003；2.河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地，河南 焦作 454000） |
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| 摘 要： | 煤层注CO2促排瓦斯主要包含气体置换和流动驱替两种作用机理，但在注气过程中哪种机理占主导地位，能否将这两种机理剥离开还需要进一步研究。为了研究注CO2促排煤中甲烷的机理及其主导地位，进行了低应力载荷条件下分层预压成型煤样注CO2置换/驱替煤层甲烷的实验。实验结果表明:在置换和驱替最初246 min内，出气口没有检测到CO2气体，注入的CO2气体全部驻留在煤体中，没有随气流排出，宏观表现为仅有置换作用而没有驱替作用。在之后的1 180 min内，注入的CO2气体一部分继续驻留在煤体中，另一部分随气体流出，宏观表现为既有置换作用又有驱替作用，置换作用减弱，驱替作用增加的过程。在注气实验后期，随着注气时间的增加，煤体中CO2逐渐吸附平衡，驱替作用开始逐渐占据主导地位。截止到实验结束时，整个阶段过程中，置换作用累计贡献率为53.32%，驱替作用累计贡献率为46.68%，置换作用累计贡献率大于驱替作用累计贡献率，随着注气不断进行驱替作用累计贡献率会逐渐上升，会出现超过置换作用累计贡献率的现象。
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| 关 键 词： | 煤层注气 置换效应 驱替效应 定量 机理 |
Quantitative study on displacement-replacement of methane in coal through CO2 injection |
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| YANG Hongmin,,XU Dongliang,CHEN Liwei,.Quantitative study on displacement-replacement of methane in coal through CO2 injection[J].Journal of Safety Science and Technology,2016,12(5):38-42. |
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| Authors: | YANG Hongmin XU Dongliang CHEN Liwei |
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| Affiliation: | (1. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China;
2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo Henan 454000, China) |
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| Abstract: | The methane release accelerating by CO2 injection into coal seam mainly includes two function mechanisms, including gas displacement and fluid replacement, but which mechanism dominates during the process of gas injection and whether the mechanisms of displacement and replacement can be separated need to be studied further. To study the mechanism of coal methane release accelerating by CO2 injection and its dominating role, the experiments on displacement-replacement of methane in coal through CO2 injection into stratified pre-pressing forming coal samples under the conditions of low stress load were conducted. The results showed that within the initial 246 min of displacement and replacement, no CO2 could be measured in the outlet, all the injected CO2 resided in the coal without discharge with the gas flow, so the macroscopical representation was only displacement function, while no replacement function. In the following 1180 min, part of the injected CO2 remained in the coal, and the others discharged with the gas flow, the macroscopical representation was both displacement function and replacement function, and the displacement function began to decrease, while the replacement function began to increase. In the later period, with the increase of gas injection time, the CO2 in coal tended to adsorption equilibrium gradually, and the replacement function began to occupy the dominating role gradually. In the whole process of gas injection, the cumulative contribution rate of displacement function was 53.32%, which was larger than that of replacement function as 46.68%. As time went on, the cumulative contribution rate of replacement function would increase gradually and exceed that of displacement function. |
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| Keywords: | gas injection into coal seam displacement effect replacement effect quantitative mechanism |
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