东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (5): 623-628.DOI: 10.12068/j.issn.1005-3026.2020.05.003

• 资源与土木工程 • 上一篇    下一篇

注二氧化碳促排煤层瓦斯机制转化过程实验研究

杨天鸿1， 陈立伟1,2， 杨宏民2， 裴蓓2   

  1. (1.东北大学 资源与土木工程学院， 辽宁 沈阳110819; 2.河南理工大学 安全科学与工程学院， 河南 焦作454000)
  • 收稿日期:2019-05-31 修回日期:2019-05-31 出版日期:2020-05-15 发布日期:2020-05-15
  • 通讯作者: 杨天鸿
  • 作者简介:杨天鸿(1968-)，男，辽宁抚顺人，东北大学教授，博士生导师.
  • 基金资助:
    河南省教育厅高等学校重点科研项目(15A440007)； 河南省科技攻关项目(172102310570).

Experimental Study on the Conversion Process of Promoting Gas Drainage Mechanism by CO2 Injection

YANG Tian-hong1， CHEN Li-wei1,2， YANG Hong-min2， PEI Bei2   

  1. 1.School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2.School of Safety Science and Engineering， Henan Polytechnic University， Jiaozuo 454000， China.
  • Received:2019-05-31 Revised:2019-05-31 Online:2020-05-15 Published:2020-05-15
  • Contact: CHEN Li-wei
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摘要： 为了厘清注CO2促排煤层瓦斯机制及主导作用，采集了豫西荥巩煤田二煤层构造软煤煤样，利用大尺度煤层注气促排瓦斯模拟实验平台，进行了注 CO2促排瓦斯实验.实验结果表明:注CO2促排煤层瓦斯是一个动态演化过程，结合国内外专家对煤层注气驱替瓦斯机理的认识，给出了置换效应和驱替效应定义.以出气口CH4体积分数的变化规律，将注气过程分为3个阶段对煤层注CO2驱替瓦斯机制转化过程进行了研究.在CO2突破腔体以前，主要表现为置换效应，注入CO2的置换效应占主导地位；CO2突破腔体之后，注入的CO2一部分与CH4发生置换吸附，另一部分与CH4流出腔体，此时置换和驱替效应共存.针对整个实验过程，CO2置换效应表现得更为明显，起主导作用.

关键词: CO2-ECBM, 促排煤层瓦斯机制, 时效性, 驱替效应, 置换效应

Abstract: In order to clarify the mechanism of driving out gas in the coal seam， the soft coal sample of the No.2 coal seam structure was collected in the Xinggong coalfield of western Henan， and the large-scale tests on CO2 injection was performed to drive out coal seam gas injection in laboratory. Results show that the CO2 injection of driving out the gas in the coal seam is a dynamic process， combined with the knowledge of domestic and foreign experts on the gas injection mechanism of coal seam gas displacement， the definition of replacement effect and displacement effect is given. Based on the change of CH4 concentration in the gas outlet， the gas injection process was divided into three stages to study the conversion process of CO2 promoting CH4 mechanism in coal seam. Before CO2 breaks through the cavity， it mainly shows the replacement effect. The replacement effect of CO2 injection is dominant. After CO2 breaks through the cavity， part of the injected CO2 is replaced with CH4， and part of it and CH4 flow out of the cavity， with a concurrent state of replacement and displacement effect. For the whole experimental process， the CO2 replacement effect is more obvious and plays a leading role.

Key words: CO2-ECBM, promote gas drainage mechanism, timeliness, displacement effect, replacement effect

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