三轴应力条件下煤层气储层渗流滞后效应试验研究  

EXPERIMENTAL RESEARCH ON SEEPAGE LAGGING EFFECTS OF COALBED METHANE RESERVOIR UNDER CONDITION OF TRIAXIAL STRESS

作　　者：许江[1,2] 周婷[1,2] 李波波[1,2] 张丹丹[1,2] 刘东[1,2] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400044

出　　处：《岩石力学与工程学报》2012年第9期1854-1861,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家科技重大专项(2011ZX05034–004);国家自然科学基金资助项目(50974141);国家重点基础研究发展计划(973)项目(2011CB201203)

摘　　要：利用自主研发的含瓦斯煤岩热–流–固耦合三轴伺服渗流装置,以型煤试件为研究对象,进行不同温度和不同围压条件下煤层气储层渗透率演化规律的试验研究。研究煤层气在煤层气储层中的运移规律并采取相应的煤层气抽放措施,可以预防煤与瓦斯突出或者对煤层气储层中赋存的煤层气进行合理利用,对于矿井建设和实现煤与煤层气共采均具有重要的实际意义。试验结果表明:(1)在不同试验条件下,煤岩三轴压缩试验过程中普遍存在着煤层气渗流速度变化滞后于应变和应力的现象,煤岩的体积最小点滞后量较大;(2)煤岩的体积最小点滞后量和应力峰值点滞后量在温度越高的试验条件下呈减小趋势;(3)煤岩所受围压通过压缩煤样侧壁,导致其内部结构变化而对煤岩的煤层气渗流速度起到阻碍作用,围压越大,体积最小点滞后量越大。By using the triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane, permeability under conditions of different confining pressures and temperatures were determined. Studying the migration law of coalbed methane and taking appropriate measures to coalbed methane can prevent coal and gas outburst, or reasonably use the methane in the coalbed methane reservoir. It is of practical significance for mine construction and coalbed methane mining. The experimental results show that： （1） Under different experimental conditions, the change of seepage velocity lags behind the change of strain and stress of coal under triaxial compression; and the lagging amount of the minimum volumetric strain is large. （2） The lagging amount of the minimum volumetric strain and the peak stress both decrease with the increase of temperature. （3） The confining pressure hinders the gas seepage through the changes of internal structure caused by compression effect of confining pressure; and the lagging of the minimum volume increases with the increase of confining pressure.

关 键 词：采矿工程 三轴压缩 渗透 滞后量 

分 类 号：TD713[矿业工程—矿井通风与安全]