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Experimental Study on Influence of Coal Structural Anisotropy to Gas Permeation

机译:煤结构各向异性对气体渗透影响的实验研究

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In underground gas extraction process, under drilling negative pressure and differential coal gas pressure, gas through a crack of coal seam flows to drill hole. The structural anisotropy of coal fracture itself makes the flow characteristics of gas in coal body quite different, especially on the bedding plane and vertical bedding conditions. The study on the effect of the structural anisotropy of coal fracture to permeability has important actual significance on choosing design parameters of drill in gas extraction design. Based on " true triaxial coal rock permeability of coal sample test system " , the permeability under different gas pressure to coal specimen in bedding plane and the vertical bedding directions are tested. The results showed that: coal structural anisotropy has a greater impact to gas permeability properties; differences in experimental coal permeability are roughly one order of magnitude. In view of the differences of the gas flow characteristics in the coal bedding plane and vertical bedding, established series and parallel choked flow model of coal sample gas seepage, and made a theoretical analysis to the influences of the bedding structure to gas permeability properties.
机译:在地下瓦斯抽采过程中,在钻井负压和煤气差压的作用下,通过裂缝的瓦斯气体流向钻孔。煤裂缝本身的结构各向异性使煤体内瓦斯流动特性大为不同,特别是在层理面和垂直层理条件下。研究煤层裂缝结构各向异性对渗透率的影响,对抽采设计中选择钻头设计参数具有重要的现实意义。基于“煤样真三轴煤渗透率测试系统”,测试了不同气体压力下在层理面和垂直层理方向对煤样的渗透率。结果表明:煤的结构各向异性对透气性有较大的影响;实验煤渗透率的差异大约是一个数量级。针对煤层气平面和垂直煤层中气体流动特征的差异,建立了煤样气渗流的串联和平行cho流模型,并对煤层气结构对气体渗透性的影响进行了理论分析。

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