摘要
为提高煤层顺层钻孔瓦斯抽采效率及经济效益,以湖南某矿3#煤层为原型,建立煤层顺层钻孔瓦斯抽采物理模型.采用COMSOL软件进行不同工况参数组合下的煤层顺层钻孔瓦斯抽采仿真研究,并结合该矿现场实际情况优化钻孔参数.结果表明:抽采负压对煤层瓦斯压力影响极小,对瓦斯抽采量影响明显;在同一抽采负压下,钻孔直径对煤层瓦斯压力有影响;在该矿3#煤层顺层钻孔瓦斯抽采中,抽采负压为18 kPa、钻孔直径为94 mm时可以达到理想的抽采效果及较好的经济效益.
In order to improve the efficiency and economic benefit of gas extraction by borehole along seam,a physical model of gas extraction by borehole along seam is established based on 3#coal seam of a mine in Hunan Province.COMSOL software is used to simulate gas extraction in coal seam drilling under different parameter combinations to optimize drilling parameters.Results show that the negative pressure of extraction has little influence on the gas pressure of coal seam.It is found that the negative pressure of extraction has obvious influence on the gas extraction amount by comparing the field measured data.Under the same negative extraction pressure,the diameter of borehole has an effect on the gas pressure of coal seam,but too large borehole construction is difficult and easy to cause hole collapse.When the negative pressure is 18 kPa and the diameter of the hole is 94 mm,the ideal extraction effect and better economic benefit can be achieved in the gas extraction of the 3#coal seam in a mine in Hunan Province.
作者
王雨田
王鹏飞
赵训
郭逸文
WANG Yutian;WANG Pengfei;ZHAO Xun;GUO Yiwen(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China;Guizhou Mine Safety Research Institute Co.,Ltd.,Guiyang 550025,China)
出处
《矿业工程研究》
2023年第3期45-52,共8页
Mineral Engineering Research
基金
国家自然科学基金资助项目(51574123)
湖南省教育厅科学研究重点资助项目(18A185)
湖南省自然科学基金资助项目(2021JJ30266)
贵州省科技支撑计划资助项目(黔科合支撑[2021]一般349)。
关键词
顺层钻孔
瓦斯压力
抽采负压
钻孔直径
数值模拟
bedding drilling
gas pressure
pumping negative pressure
borehole diameter
numerical simulation
