Research on effective extraction radius based on natural gas emission law

doi:10.16265/j.cnki.issn1003-3033.2018.10.017

Abstract

Abstract: In order to determine the effective extraction radius of the boreholes through strata, a method based on the natural gas emission characteristics of boreholes was proposed. The gas flow law around boreholes was analyzed by COMSOL Multiphysics software. According to the simulation results and the theory of coalbed methane flow, a function relationship was established between gas content, gas emission and residual gas quantity in the gas natural discharge of borehole. It is proposed that the effective extraction radius under the influence of extraction negative pressure was replaced by that based on natural gas emission law of the borehole. Field measurements were carried out in Hebi No.3 Mine, No.10 Mine and Guhanshan Mine. The results show that the gas pressure is linearly distributed within the effective extraction radius, that the natural gas emission has obvious periodic characteristics under the influence of pressure relief due to creep deformation, and the effective extraction radius is up to 4m, and that the research result conforms with the reality.

Key words: effective drainage radius, naturally emission, numerical simulation, linear distribution, segmented features, field application

CLC Number:

X936

ZHANG Mingjie, JIA Wenchao, LIANG Ximing, LI Zhe. Research on effective extraction radius based on natural gas emission law[J]. China Safety Science Journal, 2018, 28(10): 98-104.

References

[1] 刘三钧,马耕,卢杰,等.基于瓦斯含量的相对压力测定有效半径技术[J].煤炭学报,2011,36(10): 1 716-1 718.
LIU Sanjun,MA Geng,LU Jie,et al.Relative pressure determination technology for effective radius found on gas content[J].Journal of China Coal Society,2011,36(10): 1 716-1 718.
[2] 孙玉峰,许卫国,龚巍峥.基于瓦斯流量法的瓦斯抽采半径确定方法[J].煤矿机械,2014,35(8): 137-139.
SUN Yufeng,XU Weiguo,GONG Weizheng,et al.Determination of gas drainage radius based on gas flow method[J].Coal Mine Machinery,2014,35(8): 137-139.
[3] 李润芝,梁冰,孙维吉,等.顺层钻孔瓦斯抽采半径及布孔间距试验研究[J].中国安全科学学报,2016,26(10): 133-138.
LI Runzhi,LIANG Bing,SUN Weiji,et al.Experimental study on both gas drainage radius and bedding borehole space[J].China Safety Science Journal,2016,26(10): 133-138.
[4] 郝天轩,宋超.数值模拟结合SF₆示踪法确定煤层钻孔瓦斯抽采有效半径[J].中国安全科学学报,2013,23(1): 22-27.
HAO Tianxuan,SONG Chao.Determining gas extraction effective radius of bore-hole in coal seam by numerical simulation and SF₆ gas tracer method[J].China Safety Science Journal,2013,23(1): 22-27.
[5] 许彦鹏,王梦乐,刘力宁,等.基于数值模拟的钻孔抽采影响半径测试研究[J].煤炭技术,2016,35(2): 162-164.
XU Yanpeng,WANG Mengle,LIU Lining,et al.Study on influence radius of gas drainage through borehole based onnumerical simulation[J].Coal Technology,2016,35(2): 162-164.
[6] 季淮君,李增华,杨永良,等.基于瓦斯流场的抽采半径确定方法[J].采矿与安全工程学报,2013,30(6): 917-921.
JI Huaijun,LI Zenghua,YANG Yongliang,et al.Drainage radius measurement based on gas flow field[J].Journal of Mining & Safety Engineering,2013,30(6): 917-921.
[7] 周红星,程远平,谢战良。计算机模拟确定瓦斯抽放有效半径的方法研究[J].能源技术与管理,2005 (4): 81-82.
[8] 王兆丰,李炎涛,夏会辉,等.基于COMOSOL的顺层钻孔有效抽采半径的数值模拟[J].煤矿安全,2012,43(10): 4-6.
WANG Zhaofeng,LI Yantao,XIA Huihui,et al.Numerical simulation on effective drainage radius of drill hole along coal seam based on COMSOL[J].Safety in Coal Mines,2012,43(10): 4-6.
[9] 徐明智,李希建.煤层瓦斯抽放半径及其影响因素的数值模拟[J].工业安全与环保,2012,38(12): 28-30.
XU Mingzhi,LI Xijian.Numerical simulation of gas drainage radius and its influencing factors in coal seam[J].Dustrial Safety and Environmental Protection,2012,38(12): 28-30.
[10] 郭良经,张建.未卸压煤层有效瓦斯抽放半径的测定[J].煤矿安全,2011,42(9): 95-97.
GUO Liangjing,ZHANG Jian.Determination of effective gas drainage radius in coal seam without unloading pressure[J].Safety in Coal Mines,2011,42(9): 95-97.
[11] 刘佳佳,王丹,王亮,等.考虑Klinkenberg效应的瓦斯抽采流固耦合模型及其应用[J].中国安全科学学报,2016,26(12): 92-97.
LIU Jiajia,WANG Dan,WANG Liang,et al.A coupled fluid-solid model considering Klinkenberg effect for methane extraction and its application[J]. China Safety Science Journal,2016,26(12): 92-97.
[12] 国家安全生产监督管理总局.防治煤与瓦斯突出规定[L].2009-08-01.
[13] 朱南南,张浪,范喜生,等.基于瓦斯径向渗流方程的有效抽采半径求解方法研究[J].煤炭科学技术,2017,45(10): 105-110.
ZHU Nannan,ZHANG Lang,FAN Xisheng,et al.Study on the solution method of effective extraction radius based ongas radial seepage equation[J].Coal Science and Technology,2017,45(10): 105-110.
[14] 马曙,康付如,韩真理,等.煤层预抽后残余瓦斯含量分布动态预测方法[J].煤炭科学技术,2016,44(2): 94-98.
MA Shu,KANG Furu,HAN Zhenli,et al.Dynamic prediction method of residual gas content distribution for seamafter gas pre-drainage[J].Coal Science and Technology,2016,44(2): 94-98.
[15] 陈大力,郭凡进,朱德信.巷道煤壁瓦斯排放带宽度的测定[J].煤矿安全,1997,28(12): 35-38.
CHEN Dali,GUO Fanjin, ZHU Dexin.Determination of gas emission bandwidth of coal wall in roadway[J].Safety in Coal Mines,1997,28(12): 35-38.
[16] 张明杰,田加加,付帅.基于瓦斯涌出量衰减特征的钻孔抽采影响半径测定方法[J].煤矿开采,2014,19(2): 121-124.
ZHANG Mingjie,TIAN Jiajia,FU Shuai.Measurement method of bore-hole drainage influence radius based on methane gushing amount attenuation rule[J].Coal Mining Technology,2014,19(2): 121-124.