摘要
提出了一种利用注气促抽技术来治理瓦斯的方法。通过理论研究,注气促抽影响煤层瓦斯的吸附-解吸、扩散与渗流状态,对煤层瓦斯具有"置换"、"驱动携载"与"煤体增渗"作用。为进一步揭示注气促抽的原理与现场应用效果,在安徽淮南刘庄矿设计了边注边排与边注边抽两组现场试验。结果表明:注气后钻孔瓦斯抽采总量提高为原来的2~3倍,抽采周期缩短为原来的1/2,煤层瓦斯含量降低了18%以上。自然排放下的钻孔瓦斯衰减情况符合线性函数y=0.659-0.006x。常规负压抽采的钻孔衰减情况符合y=0.206+0.959exp[-(x-1.217)/8.281]函数,具有前期抽采效率高,中后期衰减速度快的特点。边注边抽试验无论是从提高抽采总量或缩短抽采周期方面都优于边注边排。
Proposes a method to control gas by using gas injection and pumping technology.Through theoretical research,gas injection and pumping influence the adsorption-desorption,diffusion and seepage state of coal seam gas,and have the functions of "displacement","driving and carrying" and "increasing permeability of coal body" for coal seam gas.In order to further reveal the principle and field application effect of gas injection and pumping,two field tests were designed in a mine in Huainan,Anhui Province,with injection and pumping at the same time.The results show that after gas injection,the total amount of gas extraction from borehole is increased to 2-3 times of the original,the extraction period is shortened to 1/2 of the original,and the content of gas in coal seam is reduced by more than 18%.The attenuation of borehole gas under natural emission conforms to the linear function y=0.659-0.006 x.The borehole attenuation of conventional negative pressure extraction conforms to the y =0.206 +0.959 exp [-(x-1.217)/8.281] function,which has the characteristics of high extraction efficiency in the early stage and fast attenuation rate in the middle and late stage.The injection while pumping test is superior to injection while pumping in terms of increasing the total amount of pumping or shortening the pumping cycle.
作者
霍中刚
杨云龙
王公达
宋鑫
舒龙勇
杨鑫
HUO Zhong-gang;YANG Yun-long;WANG Gong-da;SONG Xin;SHU Long-yong;YANG Xin(China Coal Research Institute,Beijing 100013,China;Mine Safety Technology Branch of China Coal Research Institute Co.,Ltd.,Beijing 100013,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《煤炭技术》
CAS
北大核心
2021年第12期104-109,共6页
Coal Technology
基金
国家科技重大专项项目(2016ZX05045004-006)。
关键词
瓦斯含量
边注边抽
置换
钻孔衰减
抽采瓶颈
content of gas
extraction injection
displace
borehole attenuation
extraction bottleneck
