文献类型：期刊文献

英文题名：Pore-scale investigation of immiscible displacement in rough fractures

作者：Guo, Yaohao[1,2];Zhang, Lei[3,4];Yang, Yongfei[3,4];Xu, Zhi[1,2];Bao, Bo[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[3]China Univ Petr East China, Res Ctr Multiphase Flow Porous Media, Qingdao 266580, Peoples R China;[4]China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China

年份：2021

卷号：207

外文期刊名：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

收录：;EI(收录号：20212610556892);WOS:【SCI-EXPANDED(收录号:WOS:000687758700002)】；

基金：This work was financially supported by National Natural Science Foundation of China (21808056) , PetroChina Innovation Foundation (2019D-5007-0208) . We also thank anonymous reviewers for their constructive comments that helped improve this paper.

语种：英文

外文关键词：Surface roughness; Immiscible displacement; Viscous fingering; Fracture model; Navier-Stokes equation; Enhanced oil recovery

摘要：Immiscible displacement in geological fractures is crucial for various subsurface processes. This paper aims to study the microscopic interaction between fluid and complex rough wall, and how roughness controls the immiscible displacement in fractures. The geometry model of rough surfaces is reconstructed embodying grooves with deviation depths following a Gaussian distribution. The immiscible flow and interface morphology are simulated by the Navier-Stokes equation coupled with a phase-field method. The effects of surface roughness, wall wettability and capillary number on immiscible displacement are systematically investigated through a series of displacement simulations. The results show that the pinning behavior of contact line appears at the rough surface, impelling the growth of interface length and finger formation. The surface roughness contributes to strengthening the wettability effect on interface deformation. The increasing surface roughness promotes the occurrence of contact line jumping, which causes fluid trapping in the grooves of rough surface. The amount of trapped fluid increases with capillary number in rough fractures and the critical capillary number of finger formation decreases with the increase of rough degree. The presented results can significantly improve our fundamental understanding on microscopic displacement process in geological fractures and assist to optimize the displacement scheme for enhanced oil recovery.