摘要
抽采半径影响因素很多,现场测试法测试繁琐,难以考虑众多因素。本文针对这一问题建立了描述煤层瓦斯流动瓦斯抽采固-流耦合模型,结合鹤煤八矿实际情况,分析了抽采负压、抽采时间、钻孔孔径等因素对鹤煤八矿顺层钻孔有效抽采半径的影响。研究表明:①钻孔有效抽采半径与抽采时间、钻孔孔径和煤层初始渗透率之间的关系均符合幂指数函数关系;抽采时间越长、钻孔孔径越大、煤层初始渗透率越大,钻孔有效抽采半经越大;②煤层初始渗透率对钻孔有效抽采半径影响很大,抽采时间和孔径对其的影响较大,抽采负压对其的影响基本可以忽略不计,现场可以通过实施增透措施、延长抽采时间、增大孔径以提高瓦斯抽采效果。研究结果对鹤煤八矿顺层钻孔有效抽采半经确定及保障瓦斯抽采效果有着重要的实际指导意义。对不同煤矿可调整物理参数进行模拟,以得到合适的抽采半径。
There are many factors that affect the extraction radius,the field test method is tedious,and it is difficult to consider so many factors.In view of this problem,this paper establishes a solid-liquid coupling model to describe the flow of gas in coal seam.Combined with the actual situation of No.8 Mine Hebi Coal Company,it analyzes the influence of suction negative pressure,extraction time,borehole diameter and other factors on the effective extraction radius of borehole along the seam in No.8 Mine Hebi Coal Company.The results show that:1)the relationship between the effective extraction radius of the borehole and the extraction time,the borehole diameter and the initial permeability of the coal seam are all in line with the power exponential function;the longer the extraction time is,the larger the borehole diameter is,the greater the initial permeability of the coal seam is,and the larger the effective extraction semi economy of the borehole is.2)The initial permeability of coal seam has a great influence on the effective extraction radius of the borehole,and the extraction time and pore diameter have a great influence on it.The negative pressure of extraction can be ignored basically.In the field,the gas extraction effect can be improved by implementing the anti-permeability measures,prolonging the extraction time and increasing the pore diameter.The research results have important practical guiding significance for the determination of effective drainage half through borehole and the guarantee of gas drainage effect of No.8 Mine Hebi Coal Company.The physical parameters of different coal mines can be adjusted to simulate,in order to get the appropriate extraction radius.
作者
尚宾
SHANG Bin(No.8 Mine,Hebi Coal Company,Henan Energy and Chemical Industry Group,Hebi458003,China)
出处
《煤矿现代化》
2021年第6期39-42,共4页
Coal Mine Modernization
基金
国家重点研发计划项目(2018YFC0808103)
河南省高校基本科研业务费专项资金(NSFRF180338)
河南理工大学博士基金(B2019-56)。
