摘要
为探究超声波对实际煤层的增渗及强化瓦斯抽采效果的影响,本文进行了原位应力加载下超声激励煤体渗流实验,建立了煤矿现场超声强化瓦斯抽采数学模型,进行了超声波作用下煤层瓦斯抽采过程数值模拟,分析了超声功率和作用时长对煤层瓦斯抽采的影响。结果表明:超声波处理0.5 h后,2个煤样的渗透率分别为增大36.2%~43.8%、34.3%~41.5%,表明在储层应力加载环境下超声激励对煤层仍具有较好的增渗功效。超声波作用下瓦斯抽采泄压效果明显增强,超声促抽瓦斯效果显著。25 kHz超声波作用下,4~16 kW功率超声对瓦斯抽采的强化效果随功率提升而增大。在超声波作用时间为0~2.5 h后,瓦斯抽采煤层泄压效果随超声作用时长增大而增大,表明超声波作用时长参数对强化瓦斯抽采具有积极的影响。
In order to explore the effect of ultrasonic on the increase of seepage of actual coal seam and the effect of enhanced gas drainage,this paper carried out an experiment of ultrasonically stimulated coal seepage under in-situ stress loading,established a mathematical model of ultrasonic enhanced gas drainage in coal mines,and carried out an experiment under the action of ultrasonic waves.Numerical simulation of coal seam gas drainage process was carried out,and the influence of ultrasonic power and action time on coal seam gas drainage was analyzed.The results show that the permeability of the two coal samples increased by 36.2%~43.8%and 34.3%~41.5%respectively after ultrasonic treatment for 0.5 hours,indicating that the ultrasonic excitation still has a good increase in the coal seam under the stress loading environment of the reservoir.Penetration effect.Under the action of ultrasonic,the effect of gas drainage and pressure relief is obviously enhanced,and the effect of ultrasonic gas pumping is remarkable.Under the action of 25kHz ultrasound,the enhancement effect of 4kW~16kW power ultrasound on gas drainage increases with the increase of power.After the ultrasonic action time is 0~2.5 hours,the pressure relief effect of gas drainage coal seam increases with the increase of ultrasonic action time,indicating that the ultrasonic action time parameter has a positive impact on the enhanced gas drainage.
作者
仲照海
何光安
王青如
ZHONG Zhaohai;HE Guangan;WANG Qingru(Shaanxi Shuanglong Coal Development Co.,Ltd.,Yanan727306,China)
出处
《煤矿现代化》
2023年第2期53-57,63,共6页
Coal Mine Modernization
关键词
煤层气
超声波
瓦斯抽采
coalbed methane
ultrasound
gas drainage
