清洁压裂液与水对煤层渗透率影响对比试验研究

发布时间：2019-02-22 14:49

【摘要】：针对煤矿井下采用不同压裂液增加煤层透气性的工程问题,开展了多组有效应力作用下烘干、含水与含清洁压裂液3种煤样的渗透率对比试验,并利用多孔介质和流体力学理论分析了压裂液影响煤层渗透率的机理。研究结果表明:饱和清洁压裂液煤样渗透率比饱和水煤样渗透率平均高出177.83%,随着有效应力增加,煤样渗透率均呈指数关系降低;压裂液对煤层渗透率的影响受表面张力影响,表面张力大,液体会在煤体内占据更多瓦斯运移通道,从而降低煤层透气性,与清水相比,清洁压裂液有效降低了煤体内部孔隙表面液体张力,增大了瓦斯运移通道,提高了煤层渗透率,有利于煤层气的抽采。
[Abstract]:In order to solve the engineering problem of increasing permeability of coal seam with different fracturing fluids in coal mine, a comparative test of permeability of three kinds of coal samples, such as drying, water cut and clean fracturing fluid, was carried out under the action of multiple groups of effective stress. The mechanism of the influence of fracturing fluid on coal seam permeability is analyzed by using porous media and hydrodynamic theory. The results show that the average permeability of saturated clean fracturing fluid coal sample is 177.83 higher than that of saturated water coal sample. With the increase of effective stress, the permeability of coal sample decreases exponentially. The effect of fracturing fluid on the permeability of coal seam is affected by surface tension, the surface tension is large, the liquid will occupy more gas migration channels in the coal body, thus reducing the permeability of coal seam, compared with clear water, The clean fracturing fluid can effectively reduce the pore surface liquid tension of coal body, increase the gas migration channel, increase the permeability of coal seam, and benefit the extraction of coalbed methane.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室;
【基金】：国家“十二五”科技重大专项资助项目(2011ZX05065) 国家自然科学基金资助项目(51374258) 中央高校基本科研业务费资助项目(CDJZR12240056)
【分类号】：TD712.6

【共引文献】