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中国博士后科学基金(20090450930)

作品数:2 被引量:82H指数:2
相关作者:张萌博李全贵倪冠华李贤忠翟成更多>>
相关机构:中国矿业大学更多>>
发文基金:中国博士后科学基金国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:矿业工程一般工业技术更多>>

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Microscopic properties and sealing performance of new gas drainage drilling sealing material被引量:5
2013年
The geological condition of Chinese coal mines are complex and high gassy,which account for ffty percent to seventy percent.Because of the abundant pores and cracks around the drainage drilling hole,the gas concentration attenuates rapidly,and the effective gas drainage period is short.The traditional sealing materials of yellow mud and cement-sand grout will readily shrink after the drilling hole is sealed,the sealing length is short and the sealing quality is not satisfactory.Currently widely used polyurethane material will shrink when it comes into contact with water,and the price is also very high.In this study,taking cement as a base material,a novel composite sealing material mixed by expansion admixture,additive,and fbrin and coupling agent was developed and the sealing performance and expansion property of the material were also studied and analyzed.The FEI Quanta TM 250 environmental scanning electron microscope was used to investigate the microstructure of material.The results revealed that the new composite sealing material had a desirable expansion performance and a defnite fluidity convenient for grouting.The solidifed material,combining closely with the drilling wall,possessed an adequate strength and was not easy to shrink.Compared to the conventional polyurethane,the gas drainage concentration by drilling sealing exceeded 40 percent,and the sealing capacity improves5 times,the sealing effect increases signifcantly.
Zhai ChengYu XuNi GuanhuaLi MinHao Zhiyong
低透气性煤层水力压裂增透技术应用被引量:77
2012年
针对低透气性煤层瓦斯抽采效率低、钻孔施工量大等问题,提出了水力压裂增透技术,研究了水力压裂增透机理,分析了水力压裂提高煤层透气性的过程,确定了设备仪器与压裂工艺参数,完成了高压钻孔密封与现场水力压裂,并对瓦斯抽采效果和煤层透气性系数变化进行了考察。结果显示:实施水力压裂后,瓦斯抽采量提高了7.2倍,水力压裂影响区域内煤层透气性系数提高了79~272倍,达到了增大煤层透气性,提高瓦斯抽采效率的目的。
李全贵翟成林柏泉张萌博李贤忠倪冠华
关键词:低透气性煤层水力压裂瓦斯抽采增透技术
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