低透气性煤层井下分段点式水力压裂增透  

Underground segmentation point hydraulic fracturing antireflection for low-permeability coal seams

作　　者：杨宏伟[1,2] 

机构地区：[1]北京科技大学金属矿山高效开采教育部重点实验室,北京100083 [2]煤炭科学研究总院沈阳研究院煤矿安全技术国家重点实验室,沈阳110016

出　　处：《北京科技大学学报》2012年第11期1235-1239,共5页Journal of University of Science and Technology Beijing

基　　金："十一五"国家支撑计划资助项目(2006BAK03B03)

摘　　要：通过数值分析和现场试验的手段分析了井下低透气性煤层分段点式水力压裂的原理和过程.井下分段水力压裂意在改变传统压裂的受力方式,使煤体多点受力,相互作用,最后产生压裂的效果.经过在城山煤矿西二采区水力压裂孔的试验,在压裂半径为5～7m条件下,得出了试验地点临界注水压力为14MPa,水压在14～20MPa进行分段点式水力压裂较为适宜,试验过程简单易行,在现有条件下压裂可在5 min内完成,试验地点压裂后钻孔平均抽放瓦斯流量和体积分数明显提高.The principle and process of underground segmentation point hydraulic fracturing for low-permeability coal seams were studied by means of numerical analysis and field test.Underground segmentation hydraulic fracturing is intended to change the traditional force way to make coal more force and interaction,and finally to produce the effect of fracturing.The hydraulic fracturing test at the west second mining area of Chenshan Coal Mine in northeastern China shows that when the fractured radius is 5 to 7m,the critical injection pressure is 14 MPa,and it is suitable for the hydraulic fracturing that the injection pressure is 14 to 20 MPa.The test procedure is so simple that the hydraulic fracturing can be completed within 5 min,and the average gas flow and volume fraction of gas drainage are significantly increasing after the hydraulic fracturing.

关 键 词：煤矿 开采 瓦斯 抽放 水力压裂 透气性 

分 类 号：TD712.6[矿业工程—矿井通风与安全]