摘要
近距离煤层群开采中因瓦斯负压抽导致煤层渗透率低、见效慢等技术瓶颈,以新集一矿为背景,探讨注入N_(2)-O_(2)混合气体驱替强化瓦斯抽采的效果。其中,通过构建基于THM(热-流-固)耦合模型,然后利用COMSOL软件模拟注气压力、煤层初始温度及渗透率对抽采效果的影响。结果表明,注气压力升高显著加速CH4压力降低并提升累计产量;煤层初始温度升高虽可降低瓦斯压力,但会抑制累计产量;煤层初始渗透率增加可大幅提高瓦斯抽采效率。通过本研究,可为近距离煤层群瓦斯治理提供工程应用参考价值。
In close range coal seam mining,technical bottlenecks such as low coal seam permeability and slow ef⁃fectiveness are caused by negative pressure gas extraction.Taking Xinjiyi Mine as the background,this paper ex⁃plores the effect of injecting N_(2)-O_(2) mixed gas to drive and enhance gas extraction.Among them,by constructing aTHM(thermal fluid solid)coupling model and then using COMSOL software to simulate the effects of gas injectionpressure,initial coal seam temperature,and permeability on the extraction efficiency.The results showed that theincrease in injection pressure significantly accelerated the decrease in CH4 pressure and increased cumulative pro⁃duction;Although the initial temperature rise of coal seams can reduce gas pressure,it will inhibit cumulative pro⁃duction;An increase in the initial permeability of coal seams can significantly improve the efficiency of gas extrac⁃tion.Through this study,it can provide engineering application reference value for gas control in close range coalseam groups.
作者
吴彬
WU Bin(China Coal Group,Xinji Energy Co.,Ltd.,Huainan 232001,Anhui China)
出处
《粘接》
2025年第10期163-166,共4页
Adhesion
关键词
近距离煤层群
瓦斯综合治理
抽采效果
数值模拟
closely spaced coal seam group
comprehensive gas control
gas drainage effect
numerical simulation
