东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (7): 1026-1030.DOI: 10.12068/j.issn.1005-3026.2017.07.024

• 资源与土木工程 • 上一篇    下一篇

煤层注N2促排瓦斯时效性实验研究

陈立伟1， 杨天鸿1， 杨宏民2， 冯朝阳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:2016-02-19 修回日期:2016-02-19 出版日期:2017-07-15 发布日期:2017-07-07
  • 通讯作者: 陈立伟
  • 作者简介:陈立伟(1980-) ，男，辽宁朝阳人，东北大学博士研究生； 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:
    国家自然科学基金资助项目(51174081)； 国家自然科学基金青年基金资助项目(51404091).

Experimental Research on Timeliness of Promoting Gas Drainage by N2 Injection in Coal Bed

CHEN Li-wei1， YANG Tian-hong1， YANG Hong-min2， FENG Zhao-yang2   

  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:2016-02-19 Revised:2016-02-19 Online:2017-07-15 Published:2017-07-07
  • Contact: CHEN Li-wei
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摘要： 为了研究煤层注弱吸附性气体强化瓦斯排放的过程和效果，利用自行搭建的煤层注气驱替实验装置，进行了注N2驱替CH4实验.实验结果表明:注N2驱替煤层CH4具有时效特性，排出CH4体积分数逐渐衰减，流量先升后降.注气压力对驱替CH4效果显著，注气压力越高，驱出CH4体积分数衰减越快，驱出气体流量越大，增流效应越明显;相同时间内，注气压力越高，累计驱出CH4体积越大，促排效果越明显.结合实验过程中二元气体物理状态变化规律，认为注N2促排煤层CH4机理有:气体的置换作用、气流的携载作用和气流的稀释扩散作用等.

关键词: N2-ECBM, 促排瓦斯, 时效性, 置换, 携载, 扩散

Abstract: In order to make clearly the process and features of gas emission by injecting N2， N2 displacement coal seam CH4 tests were performed by using coal bed gas injection displacement experiment device. The results show that N2 displacement coal bed CH4 is a time-dependent process with a gradual decay of drained CH4 concentration， and CH4 flow increases at first and then decreases. Gas injection pressure has significant impact on the displacement effect， the higher the injection pressure， the faster the drained CH4 concentration decay， the larger injection gas flow， the more significant the flow rate increases. During the same time， the higher gas injection displacement pressure is， the larger the drained CH4 volume. According to the theoretical analysis， the mechanisms of injecting N2 displacement coal bed CH4 include the gas displacement， the air carrying and the dilution and diffusion of gas flow.

Key words: N2-ECBM, promoting gas drainage, timeliness, displacement, carrying, diffusion

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