The impact of fines migration on fracture transmissivity reduction was investigated by injecting a brine solution containing a suspension of 0.1 wt.% kaolinite particles with a mean particle size distribution of 9.6 μm through fractured shale core samples. The fractures had apertures estimated to be approximately 100 μm. A mass balance approach was used to determine the quantity of kaolinite that was deposited within the fractures (influent – effluent = amount deposited in fractures). Large fractions (44–90%) of the suspended kaolinite pumped through the fractures were deposited within the fractures. Based on fracture volumes estimated with X-ray computed tomography, it was determined that approximately 10 to 17% of the fracture volume was filled with kaolinite at the point when flow was completely restricted. These results indicate that 100 μm fractures in CO₂ reservoir caprocks could be sealed within hours if the brines passing through the fractures contain a proportional volume of particulates to the tests performed in this laboratory study. © 2021 Battelle Memorial Institute. Greenhouse Gases: Science and Technology published by Society of Chemical Industry and John Wiley & Sons Ltd.

中文翻译：

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通过细粒迁移封闭代表性 CO2 储层盖层中的裂缝

通过将平均粒径分布为 9.6 μm 的 0.1 wt.% 高岭石颗粒悬浮液注入破碎的页岩岩心样品，研究了细粒迁移对裂缝透射率降低的影响。裂缝的孔径估计约为 100 微米。质量平衡方法用于确定沉积在裂缝中的高岭石数量（流入 - 流出物 = 沉积在裂缝中的量）。通过裂缝泵送的大部分悬浮高岭石 (44-90%) 沉积在裂缝内。根据 X 射线计算机断层扫描估计的裂缝体积，确定在完全限制流动的点处，约 10% 到 17% 的裂缝体积被高岭石填充。如果通过裂缝的盐水包含与本实验室研究中进行的测试成比例的颗粒体积，则可以在数小时内密封_{2 个}储层盖层。© 2021 巴特尔纪念研究所。温室气体：科学与技术由化学工业协会和约翰威利父子公司出版。