钻孔流量法在本煤层钻孔抽采半径考察中的应用
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摘要
为准确考察本煤层钻孔有效抽采半径,根据煤层瓦斯流动理论建立了钻孔瓦斯流量与时间的关系式,分析了在不同瓦斯赋存条件下进行试验考察的指标标准,并结合肥田煤矿为突出煤层开采的实际情况采用瓦斯含量和抽采率指标法确定抽采达标时间,最终得出抽采半径与抽采时间之间的相关关系为R=0. 7005lnt-2. 0749。考察结果表明:有效抽采半径随时间增加而增大,逐渐趋于极限有效抽采半径2m;抽采时间为37d、89d、168d、318d时对应的有效抽采半径为0. 5m、1m、1. 5m、2m。通过现场试验证明钻孔流量法可用于本煤层钻孔抽采半径考察。
In order to accurately investigate the effective extraction radius of mining coal seam borehole,the relationship between the gas flow rate of the borehole and the time was established based on the theory of gas flow in the coal seam. The index standard of experimental investigation under different gas occurrence conditions was analyzed. The extraction standard time t was determined using the gas content and extraction rate index method in combination with the actual situation of Feitian Coal Mine in order to highlight the coal seam mining. Finally,the correlation between the extraction radius r and the extraction time t was obtained as R = 0. 7005 lnt-2. 0749. The investigation results show that the effective extraction radius increases with time and gradually approaches the limit effective extraction radius of 2 m. When the extraction time is 37 d,89 d,168 d,318 d,the corresponding effective extraction radius is 0. 5 m,1 m,1. 5 m,2 m. The field test proves that the drilling flow method can be used to investigate the extraction radius of drilling holes in mining coal seam.
In order to accurately investigate the effective extraction radius of mining coal seam borehole,the relationship between the gas flow rate of the borehole and the time was established based on the theory of gas flow in the coal seam. The index standard of experimental investigation under different gas occurrence conditions was analyzed. The extraction standard time t was determined using the gas content and extraction rate index method in combination with the actual situation of Feitian Coal Mine in order to highlight the coal seam mining. Finally,the correlation between the extraction radius r and the extraction time t was obtained as R = 0. 7005 lnt-2. 0749. The investigation results show that the effective extraction radius increases with time and gradually approaches the limit effective extraction radius of 2 m. When the extraction time is 37 d,89 d,168 d,318 d,the corresponding effective extraction radius is 0. 5 m,1 m,1. 5 m,2 m. The field test proves that the drilling flow method can be used to investigate the extraction radius of drilling holes in mining coal seam.
引文
[1]王兆丰,周少华,李志强.瓦斯抽采钻孔有效抽采半径的数值计算方法[J].煤炭工程,2011,43(6):82-84.
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[4]陈金玉,马丕梁,孔一凡,等. SF6气体示踪法测定钻孔瓦斯抽采有效半径[J].煤矿安全,2008,39(9):23-25.
[5]辛明.利用SF6示踪技术测试煤层瓦斯抽采半径[J].安徽理工大学学报(自然科学版),2012,32(1):64-66.
[6]郝富昌,刘明举,孙丽娟.瓦斯抽采半径确定方法的比较及存在问题研究[J].煤炭科学技术,2012,40(12):55-58.
[7]刘华锋,陈辉.顺层钻孔瓦斯抽采半径确定及抽采效果考察研究[J].中国煤炭,2013,39(6):83-86.
[8]余陶,卢平,孙金华,等.基于钻孔瓦斯流量和压力测定有效抽采半径[J].采矿与安全工程学报,2012,29(4):596-600.
[9]邹云龙.单一煤层顺层钻孔瓦斯抽采半径动态测定方法研究[J].煤炭工程,2017,49(5):8-10,14.
[10]徐青伟,王兆丰,王立国.有效抽采半径与考察区域形状布孔间距的关系研究[J].煤矿安全, 2018, 49(4):144-147.
[11]王宏图,江记记,王再青,等.本煤层单一顺层瓦斯抽采钻孔的渗流场数值模拟[J].重庆大学学报,2011,34(4):24-29.
[12]吕贵春.可解吸瓦斯含量降低法在顺层钻孔瓦斯抽采半径考察中的应用[J].矿业安全与环保,2012,39(2):52-55.
[13]王闯,石永生,回春伟,等.基于抽采评判指标的有效抽采半径确定方法[J].煤炭工程,2016,48(1):81-83,87.
[14]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):1716-1719.
[15]徐青伟,王兆丰,徐书荣,等.多煤层穿层钻孔瓦斯抽采有效抽采半径测定[J].煤炭科学技术,2015,43(7):83-88.
[16]国家安全生产监督管理总局,国家煤矿安全监察局.煤矿瓦斯抽采达标暂行规定[Z]. 2011.
[2]徐东方,王兆丰.压降法测定钻孔的抽采影响半径试验研究[J].煤矿安全,2009,40(5):1-3.
[3]徐遵玉.穿层钻孔预抽煤层瓦斯有效半径考察方法研究[J].煤炭工程,2018,50(2):19-22.
[4]陈金玉,马丕梁,孔一凡,等. SF6气体示踪法测定钻孔瓦斯抽采有效半径[J].煤矿安全,2008,39(9):23-25.
[5]辛明.利用SF6示踪技术测试煤层瓦斯抽采半径[J].安徽理工大学学报(自然科学版),2012,32(1):64-66.
[6]郝富昌,刘明举,孙丽娟.瓦斯抽采半径确定方法的比较及存在问题研究[J].煤炭科学技术,2012,40(12):55-58.
[7]刘华锋,陈辉.顺层钻孔瓦斯抽采半径确定及抽采效果考察研究[J].中国煤炭,2013,39(6):83-86.
[8]余陶,卢平,孙金华,等.基于钻孔瓦斯流量和压力测定有效抽采半径[J].采矿与安全工程学报,2012,29(4):596-600.
[9]邹云龙.单一煤层顺层钻孔瓦斯抽采半径动态测定方法研究[J].煤炭工程,2017,49(5):8-10,14.
[10]徐青伟,王兆丰,王立国.有效抽采半径与考察区域形状布孔间距的关系研究[J].煤矿安全, 2018, 49(4):144-147.
[11]王宏图,江记记,王再青,等.本煤层单一顺层瓦斯抽采钻孔的渗流场数值模拟[J].重庆大学学报,2011,34(4):24-29.
[12]吕贵春.可解吸瓦斯含量降低法在顺层钻孔瓦斯抽采半径考察中的应用[J].矿业安全与环保,2012,39(2):52-55.
[13]王闯,石永生,回春伟,等.基于抽采评判指标的有效抽采半径确定方法[J].煤炭工程,2016,48(1):81-83,87.
[14]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):1716-1719.
[15]徐青伟,王兆丰,徐书荣,等.多煤层穿层钻孔瓦斯抽采有效抽采半径测定[J].煤炭科学技术,2015,43(7):83-88.
[16]国家安全生产监督管理总局,国家煤矿安全监察局.煤矿瓦斯抽采达标暂行规定[Z]. 2011.