基于微震监测技术的塔山煤矿工作面瓦斯抽放
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摘要
为了从源头上治理瓦斯涌出,提高瓦斯抽排效率,采用微震监测技术监测工作面顶板岩层裂隙发育情况,总结采场围岩瓦斯运移规律,分析瓦斯积聚及储存场所,现场观测发现:塔山煤矿8103工作面顶板岩层破裂高度为75 m,该破裂区域为工作面瓦斯涌出源,应以此为源头截住上邻近层瓦斯,瓦斯抽放钻孔终孔点的最佳布置位置应为距顶板75 m的范围内。根据监测的瓦斯积聚区域设计瓦斯抽放钻孔以抽放工作面上邻近层瓦斯,设计钻孔的平均抽放量为0.64 m3/min,当钻孔数量达到20个时,抽放量为12.8 m3/min,工作面绝对瓦斯涌出量可以降低33%以上。
In order to control the gas emission from the source point and to improve the gas drainage efficiency,a micro seismic monitoring and measuring technology was applied to monitor and measure the rack development in the roof strata above the coal mining face.The paper summarized the gas migration law of the surrounding rocks at the coal mining face and analyzed the gas accumulation and storage filed.The site observation found that the crack height in the roof strata above the No.8103 coal mining face in Tashan Mine was 75 m and this coal mining area was the source of the face gas emission.Thus this source should be sealed to stop the gas from above seam and the optimized layout location for the terminal end of the gas drainage borehole should be within 75 m from the roof.According to the gas accumulated area which was monitored and measured,the gas drainage borehole was designed to drain the gas from above seam and the average drainage value of the borehole designed was 0.64 m3/min.When the amount of the borehole drilling operation reached to 20 and the gas drainage value reached to 12.8 m3/min,the gas emission absolute value from the coal mining face would be reduced over 33%.
In order to control the gas emission from the source point and to improve the gas drainage efficiency,a micro seismic monitoring and measuring technology was applied to monitor and measure the rack development in the roof strata above the coal mining face.The paper summarized the gas migration law of the surrounding rocks at the coal mining face and analyzed the gas accumulation and storage filed.The site observation found that the crack height in the roof strata above the No.8103 coal mining face in Tashan Mine was 75 m and this coal mining area was the source of the face gas emission.Thus this source should be sealed to stop the gas from above seam and the optimized layout location for the terminal end of the gas drainage borehole should be within 75 m from the roof.According to the gas accumulated area which was monitored and measured,the gas drainage borehole was designed to drain the gas from above seam and the average drainage value of the borehole designed was 0.64 m3/min.When the amount of the borehole drilling operation reached to 20 and the gas drainage value reached to 12.8 m3/min,the gas emission absolute value from the coal mining face would be reduced over 33%.
引文
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[2]李凤琴,张兴民,姜福兴.煤矿井下微震监测系统及应用[J].煤田地质与勘探,2006,34(4):35-37.
[3]杜娟,杨树敏.井间微地震监测技术现场应用效果分析[J].大庆石油地质与开发,2007(4):16-19.
[4]姜福兴,杨淑华.微地震监测揭示的采场围岩空间破裂形态[J].煤炭学报,2003,28(4):45-49.
[5]于克君.煤层顶板“两带”高度的微地震监测技术[J].煤田地质与勘探,2002,30(1):21-23.
[6]申晋,赵阳升.三峡永久船闸高边坡岩体裂隙分布的分形研究[J].岩土工程学报,1998,20(5):97-99.
[7]张莉.微地震监控技术[J].石油钻采工艺,2003(3):11-13.
[8]刘百红,秦绪英,郑四连,等.微地震监测技术及其在油田中的应用现状[J].勘探地球物理进展,2005,28(5):325-329.
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