瓦斯抽采钻孔围岩漏气流场分析及漏气位置测定研究
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摘要
钻孔密封段漏气是降低钻孔抽采瓦斯浓度的主要原因。为分析钻孔围岩漏气流场分布特征并指导漏气位置确定,利用FLUENT软件对钻孔围岩漏气流场进行模拟分析,得出了不同钻孔密封条件下的围岩漏气分布及强度特征;同时,开发了钻孔束管式定点甲烷浓度检测装置,并给出了相应的漏气位置判定模型,并在现场进行试验分析。研究结果表明,钻孔密封深度和煤壁裂隙对钻孔密封段漏气具有明显控制作用,且高河能源W4301回风巷瓦斯抽采钻孔漏气主要由钻孔密封深度和长度不足及钻孔间距较小所致,增加钻孔密封长度后,平均单孔瓦斯抽采浓度可增加3～5倍,该研究成果对于快速分析钻孔漏气特性,并制定出相应的合理提浓措施具有重要的意义。
The leakage in boreholes sealing section is the main reason to reduce the gas concentration. Therefore,in order to analyze the distribution characteristics of the air leakage field in the surrounding of boreholes and to guide the determination of the air leakage location. The air leakage field in the surrounding rock of boreholes was simulated and analyzed by using Fluent software,and the distribution and strength characteristics of the air leakage in surrounding rock under different sealing conditions were obtained. And a fixed point measuring device of methane concentration in the drainage borehole was developed,and the field test analysis is also carried out. The results show that,the sealing depth of boreholes and coal wall cracks have obvious control effect on gas leakage in the sealing section of boreholes. And the leakage of gas extraction borehole in the return air channel of Gaohe Energy W4301 is mainly caused by the insufficient sealing depth and length of the borehole and the small spacing between the boreholes. By increasing the sealing depth and length of the borehole,the average concentration of gas extraction in a single hole can be increased by 3 ～ 5 times. The results of the study are important for quickly analyzing the characteristics of the holes in the hole,and making the appropriate increase in the production of the gas.
The leakage in boreholes sealing section is the main reason to reduce the gas concentration. Therefore,in order to analyze the distribution characteristics of the air leakage field in the surrounding of boreholes and to guide the determination of the air leakage location. The air leakage field in the surrounding rock of boreholes was simulated and analyzed by using Fluent software,and the distribution and strength characteristics of the air leakage in surrounding rock under different sealing conditions were obtained. And a fixed point measuring device of methane concentration in the drainage borehole was developed,and the field test analysis is also carried out. The results show that,the sealing depth of boreholes and coal wall cracks have obvious control effect on gas leakage in the sealing section of boreholes. And the leakage of gas extraction borehole in the return air channel of Gaohe Energy W4301 is mainly caused by the insufficient sealing depth and length of the borehole and the small spacing between the boreholes. By increasing the sealing depth and length of the borehole,the average concentration of gas extraction in a single hole can be increased by 3 ～ 5 times. The results of the study are important for quickly analyzing the characteristics of the holes in the hole,and making the appropriate increase in the production of the gas.
引文
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[3]薛明理,岑培山,程洪亮,等.巷道围压分布规律对顺层钻孔封孔质量影响分析[J].煤炭工程,2015,47(2):56-58.
[4]周福宝,孙玉宁,李海鉴,等.煤层瓦斯抽采钻孔密封理论模型与工程技术研究[J].中国矿业大学学报,2016,45(3):433-439.
[5]胡胜勇,刘红威.煤层瓦斯抽采钻孔漏气机理及应用研究进展[J].煤矿安全,2016,47(5):170-173.
[6]王永龙,王振锋,孙玉宁,等.煤壁应力峰值动态移动诱发封孔漏气机理研究[J].安全与环境学报,2016,16(5):129-134.
[7]王志明,孙玉宁,王永龙,等.瓦斯抽采钻孔动态漏气圈特性及漏气处置研究[J].中国安全生产科学技术,2016,12(5):139-145.
[8]成艳英,林柏泉,郝志勇,等.基于CFD模拟的巷道煤壁喷涂对瓦斯抽采影响研究[J].中国煤炭,2013,39(4):86-90.
[9]周厚权,申凯,陈宾.瓦斯抽采钻孔漏气类型划分与高效封孔技术应用研究[J].矿业安全与环保,2019,46(1):33-36,42.
[10]张天军,宋爽,李树刚,等.瓦斯抽采钻孔封孔质量检测技术与应用[J].西安科技大学学报,2017,37(5):623-629.
[11]任青山,邹静,赵立朋.瓦斯抽采钻孔密封质量的简易监测方法及现场试验[J].矿业安全与环保,2016,43(1):89-91.
[12]周俊.端氏煤矿瓦斯抽采钻孔封孔质量检验方法应用研究[J].矿业安全与环保,2018,45(4):66-69.
[13]常宇.瓦斯抽采钻孔封孔质量检测设备的研制[J].煤矿机械,2017,38(12):21-22.
[14]王兆丰,武炜.煤矿瓦斯抽采钻孔主要封孔方式剖析[J].煤炭科学技术,2014,42(6):31-34,103.
[15]张福旺,范付恒,秦汝祥.囊袋式两堵一注封孔装置在顺层钻孔瓦斯抽采中的应用[J].煤炭工程,2013,45(11):57-59.