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科学通报  2014 

页岩压裂中压裂液返排率低的孔隙尺度模拟与解释

DOI: 10.1360/N972014-00461, PP. 3197-3203

Keywords: 页岩,孔隙尺度,格子Boltzmann方法,数字岩心,水力压裂

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Abstract:

针对页岩压裂过程中,压裂液返排效率普遍很低的现象,基于高分辨率页岩岩样SEM(scanningelectronmicroscope)电子显微镜扫描图像,利用马尔科夫链蒙特卡罗(MarkovChainMonteCarlo)方法重构得到页岩的三维数字岩心,采用具有高密度比的格子Boltzmann模型,从孔隙尺度来模拟页岩中气水两相驱替过程.首先通过计算表面张力和相对渗透率来验证模型的准确性,然后模拟页岩数字岩心中的油水两相流动,页岩中首先饱和水(气)相,然后从一端注入气(水)相,模拟终止条件为驱替相在出口端发生突破,气水运动黏度比和密度比分别设置为101和11000.水驱气过程中发生突破时,水相的饱和度为70%,而气驱水过程中发生突破时,气相的饱和度只有4.5%,给出了三维数字岩心中驱替相分布,在气驱水的过程中发生突破时,大部分水被滞留在页岩孔隙中,从而解释了页岩水力压裂中,压裂液返排效率低于10%的现象.

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