温度和围压耦合作用下煤样渗透率变化的试验研究

发布时间：2018-04-12 06:19

  本文选题：低变质程度 + 孔隙结构　； 参考：《煤炭科学技术》2017年12期

【摘要】：为了探究不同温度和围压耦合影响下的煤样渗透率变化特征,选用甘肃新北矿区低变质程度的烟煤,采用实验室试验的方法,借助Quanta TM 250扫描电子显微镜、Auto Pore IV 9500全自动压汞仪、Autosorb-1型全自动比表面和孔径分布分析仪,对煤样的内外部孔隙特征进行了测试分析;采用自主搭建的瓦斯渗流测定装置,对不同温度和围压耦合条件下的原煤瓦斯渗流进行了测定。结果表明:在试验采用的温度、围压变化范围(25~80℃,3~9 MPa)内,所测得的16组煤样渗透率均表现出了较强的温度、压力敏感性,围压对渗透率的影响明显高于温度对渗透率的影响;随着温度和围压的增大,渗透率呈减小趋势,而且减小趋势逐渐放缓,变化符合幂函数关系;温度与围压耦合时对煤样渗透率的影响显著,渗透率的变化服从指数分布。
[Abstract]:In order to investigate the characteristics of permeability change of coal samples under the influence of different temperature and confining pressure coupling, bituminous coal with low metamorphic degree in Xinbei Mining area, Gansu Province, was selected, and the method of laboratory test was used.With the help of Quanta TM 250 scanning electron microscope and Auto Pore IV 9500 automatic mercury injection instrument, Autosorb 1 automatic specific surface and pore size distribution analyzer, the internal and external pore characteristics of coal samples were tested and analyzed.The percolation of raw coal gas at different temperature and confining pressure was measured.The results show that the permeability of 16 groups of coal samples measured in the temperature range of 2580 鈩，

本文编号：1738525