微模型
渗吸
润湿
毛细管压力
多孔介质
相对渗透率
毛细管作用
饱和(图论)
相(物质)
磁导率
两相流
机械
石油工程
岩土工程
物理
材料科学
多孔性
地质学
复合材料
化学
膜
流量(数学)
生物化学
植物
发芽
数学
组合数学
量子力学
生物
作者
Jian Tian,Qiang Chen,Chao Qin,Yili Kang,Na Jia,Zhiyu Xi
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2022-06-01
卷期号:34 (6)
被引量:25
摘要
When water imbibes into tight rocks, the disconnection of bulk gas phase will significantly impact the performance of gas recovery. In this work, we have conducted a systematic micromodel study on the disconnection of gas phase during water imbibition. Seven types of micromodels were designed that can geometrically mimic basic pore structures of a tight sandstone. Then, we conducted capillary-dominant imbibition experiments and analyzed the effects of pore geometry and pore-throat ratio on the transient evolutions of gas–water interfaces. Our pore-scale results reveal that snap-off and bypassing flows are the two main mechanisms that determine disconnection and entrapment of the gas phase. Moreover, we qualitatively linked the pore-scale two-phase displacements to the core-scale “permeability jail” phenomenon (i.e., nearly immobile of non-wetting and wetting phases across a wide range of saturation values). Our study will enrich the knowledge of entrapment behaviors of the gas phase during water imbibition into tight formations.
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