Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021WR029688 |
A Coreflood-on-a-Chip Study of Viscoelasticity’s Effect on Reducing Residual Saturation in Porous Media | |
Yujing Du; Ke Xu; Lucas Mejia; Matthew Balhoff | |
2021-07-09 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Polymer aqueous solutions are widely used in NAPL recovery and aquifer remediation processes due to their high viscosity. Additional reduction of residual saturation by polymer’s viscoelasticity has recently been discovered which elevates the ultimate displacement efficiency. However, there is no consensus on how, and under what conditions, viscoelasticity reduces residual saturation. This is in part because most studies utilize relatively low salinity and high viscosity, which also contribute to higher recoveries. We separate the effects of viscosity, elasticity and salinity, by performing microfluidic experiments in long (30 cm) heterogeneous glass micromodels (coreflood-on-a-chip). In the experiments, a highly viscous Newtonian aqueous phase flood is first performed so that the system reaches residual saturation, followed by polymer flood with varying elasticity and salinity. This is followed by another highly viscous Newtonian aqueous phase flood. We observe significant redistribution and reconnection of residual ganglia due to viscoelasticity induced instabilities during high-viscoelasticity polymer floods, which results in residual ganglia remobilization that ultimately reduces residual saturation. In contrast, no fluid redistribution and saturation reduction are observed in low-viscoelasticity polymer floods. During low salinity polymer floods (regardless of the relative elasticity), spontaneous emulsification occurs inside ganglia and results in ganglia swelling, which enhances ganglia reconnection when elastic instability happens, therefore amplifies the residual saturation reduction. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
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/333740 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Yujing Du,Ke Xu,Lucas Mejia,等. A Coreflood-on-a-Chip Study of Viscoelasticity’s Effect on Reducing Residual Saturation in Porous Media[J]. Water Resources Research,2021. |
APA | Yujing Du,Ke Xu,Lucas Mejia,&Matthew Balhoff.(2021).A Coreflood-on-a-Chip Study of Viscoelasticity’s Effect on Reducing Residual Saturation in Porous Media.Water Resources Research. |
MLA | Yujing Du,et al."A Coreflood-on-a-Chip Study of Viscoelasticity’s Effect on Reducing Residual Saturation in Porous Media".Water Resources Research (2021). |
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