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DOI | 10.1002/2017WR021051 |
Visualizing and quantifying the crossover from capillary fingering to viscous fingering in a rough fracture | |
Chen, Yi-Feng; Fang, Shu; Wu, Dong-Sheng; Hu, Ran | |
2017-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Immiscible fluid-fluid displacement in permeable media is important in many subsurface processes, including enhanced oil recovery and geological CO2 sequestration. Controlled by capillary and viscous forces, displacement patterns of one fluid displacing another more viscous one exhibit capillary and viscous fingering, and crossover between the two. Although extensive studies investigated viscous and capillary fingering in porous media, a few studies focused on the crossover in rough fractures, and how viscous and capillary forces affect the crossover remains unclear. Using a transparent fracture-visualization system, we studied how the two forces impact the crossover in a horizontal rough fracture. Drainage experiments of water displacing oil were conducted at seven flow rates (capillary number log(10)Ca ranging from -7.07 to -3.07) and four viscosity ratios (M=1/1000,1/500,1/100 and 1/50). We consistently observed lower invading fluid saturations in the crossover zone. We also proposed a phase diagram for the displacement patterns in a rough fracture that is consistent with similar studies in porous media. Based on real-time imaging and statistical analysis of the invasion morphology, we showed that the competition between capillary and viscous forces is responsible for the saturation reduction in the crossover zone. In this zone, finger propagation toward the outlet (characteristic of viscous fingering) as well as void-filling in the transverse/backward directions (characteristic of capillary fingering), are both suppressed. Therefore, the invading fluid tends to occupy larger apertures with higher characteristic front velocity, promoting void-filling toward the outlet with thinner finger growth and resulting in a larger volume of defending fluid left behind. |
英文关键词 | rough fracture immiscible displacement crossover zone capillary fingering viscous fingering front velocity |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413484200015 |
WOS关键词 | ENHANCED OIL-RECOVERY ; POROUS-MEDIA ; 2-PHASE FLOW ; WALLED FRACTURES ; RELATIVE PERMEABILITY ; INVASION-PERCOLATION ; PORE NETWORK ; IMMISCIBLE DISPLACEMENTS ; FLUID DISPLACEMENT ; SURFACE-ROUGHNESS |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21950 |
专题 | 资源环境科学 |
作者单位 | Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan, Hubei, Peoples R China |
推荐引用方式 GB/T 7714 | Chen, Yi-Feng,Fang, Shu,Wu, Dong-Sheng,et al. Visualizing and quantifying the crossover from capillary fingering to viscous fingering in a rough fracture[J]. WATER RESOURCES RESEARCH,2017,53(9). |
APA | Chen, Yi-Feng,Fang, Shu,Wu, Dong-Sheng,&Hu, Ran.(2017).Visualizing and quantifying the crossover from capillary fingering to viscous fingering in a rough fracture.WATER RESOURCES RESEARCH,53(9). |
MLA | Chen, Yi-Feng,et al."Visualizing and quantifying the crossover from capillary fingering to viscous fingering in a rough fracture".WATER RESOURCES RESEARCH 53.9(2017). |
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