丁集煤矿煤层瓦斯基础参数及抽采影响半径测试研究
发布时间：2018-07-30 08:09
【摘要】：本文针对丁集煤矿11-2煤层、13-1煤层瓦斯赋存实际情况,测试得到了11-2、13-1两煤层的瓦斯基础参数,通过把两煤层的透气性系数与抽采难易程度标准相对照判断得到：11-2煤层1#钻孔处和13-1煤层2#钻孔处煤层抽采难易程度都为勉强抽采。 从现场试验可以看出压降法测定底板穿层钻孔抽采影响半径是一种简单、有效的方法。本文对压降法的测试原理及具体方法进行了探讨研究,并将该方法在丁集煤矿进行了现场试验,测试结果如下：丁集煤矿13-1煤层在采用孔径94mmm抽采钻孔进行煤层瓦斯抽采,当抽采负压为24KPa,抽采时间为43d时,其抽采影响半径为4m,抽采51d后影响半径为5m；测试到了11-2煤层在采用94mm钻孔进行煤层瓦斯抽采,当抽采负压为24KPa,抽采时间为36d时,其抽采影响半径为3m,且可知瓦斯抽采钻孔抽采47d时影响半径为4.5m,抽采54d后影响半径为5m。根据抽采时间与半径之间的关系,优化了11-2煤层、13-1煤层底板穿层钻孔的布置,将相邻两个预抽钻孔间距6m优化为l0m间距布置,避免了设计和施工过程中煤层内出现钻孔的无效重叠,该测试结果为丁集煤矿瓦斯抽采及防治工作提供了重要依据。
[Abstract]:In this paper, according to the actual situation of gas occurrence in 11-2 coal seam and 13-1 coal seam in Dingji Coal Mine, the gas foundation parameters of 11 ~ 2N ~ (13) ~ (-1) coal seam are obtained by testing. By comparing the permeability coefficient of the two coal seams with the standard of extraction difficulty, it is concluded that the difficulty degree of extracting coal seam at the # 11-2 coal seam and the 13-1 coal seam borehole is forced extraction. It can be seen from the field test that the pressure drop method is a simple and effective method for determining the influence radius of borehole pumping through the bottom layer. In this paper, the testing principle and concrete method of pressure drop method are studied, and the field test of this method is carried out in Dingji Coal Mine. The test results are as follows: 13-1 coal seam in Dingji Coal Mine is using hole diameter 94mmm drainage borehole to carry out coal seam gas drainage. When the suction negative pressure is 24 KPA and the extraction time is 43 days, the influence radius of extraction is 4 m, and the influence radius is 5 m after 51 days of extraction. The test results show that 11-2 coal seam is using 94mm borehole to extract coal seam gas, when the suction negative pressure is 24 KPA, and the extraction time is 36 days, The influence radius of gas extraction is 3 m, and the influence radius is 4.5 m in 47 days and 5 m after 54 days of gas extraction. According to the relation between the extraction time and the radius, the arrangement of drilling holes in the floor of coal seam No. 13-1 in 11-2 coal seam is optimized, and the interval between the adjacent two pre-pumping boreholes is optimized to be 10 m spacing. The invalid overlap of boreholes in the coal seam during the design and construction is avoided. The test results provide an important basis for gas extraction and prevention in Dingji Coal Mine.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712
本文编号：2154371
[Abstract]:In this paper, according to the actual situation of gas occurrence in 11-2 coal seam and 13-1 coal seam in Dingji Coal Mine, the gas foundation parameters of 11 ~ 2N ~ (13) ~ (-1) coal seam are obtained by testing. By comparing the permeability coefficient of the two coal seams with the standard of extraction difficulty, it is concluded that the difficulty degree of extracting coal seam at the # 11-2 coal seam and the 13-1 coal seam borehole is forced extraction. It can be seen from the field test that the pressure drop method is a simple and effective method for determining the influence radius of borehole pumping through the bottom layer. In this paper, the testing principle and concrete method of pressure drop method are studied, and the field test of this method is carried out in Dingji Coal Mine. The test results are as follows: 13-1 coal seam in Dingji Coal Mine is using hole diameter 94mmm drainage borehole to carry out coal seam gas drainage. When the suction negative pressure is 24 KPA and the extraction time is 43 days, the influence radius of extraction is 4 m, and the influence radius is 5 m after 51 days of extraction. The test results show that 11-2 coal seam is using 94mm borehole to extract coal seam gas, when the suction negative pressure is 24 KPA, and the extraction time is 36 days, The influence radius of gas extraction is 3 m, and the influence radius is 4.5 m in 47 days and 5 m after 54 days of gas extraction. According to the relation between the extraction time and the radius, the arrangement of drilling holes in the floor of coal seam No. 13-1 in 11-2 coal seam is optimized, and the interval between the adjacent two pre-pumping boreholes is optimized to be 10 m spacing. The invalid overlap of boreholes in the coal seam during the design and construction is avoided. The test results provide an important basis for gas extraction and prevention in Dingji Coal Mine.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712
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