Application of Aqueous Two-Phase System

Topic Information

Dear Colleagues,

Aqueous two-phase technology is a new separation and enrichment technology that has been developed in recent years. This technology has the advantages of simple operation, high separation efficiency, a high enrichment factor, mild mass transfer, low organic solvent consumption and low cost. It is widely used in the separation of active biomolecules, sample preparation for instrumental analysis, and the separation of organic contaminants. The main goals of this Topic are to publish the recent developments of new technologies and methods based on aqueous two-phase systems for the separation of bioactive substances.

Dr. Bin Jiang
Prof. Dr. Zhibiao Feng
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Analytica analytica	-	1.8	2020	17.9 Days	CHF 1000
Energies energies	3.0	6.2	2008	16.8 Days	CHF 2600
Materials materials	3.1	5.8	2008	13.9 Days	CHF 2600
Molecules molecules	4.2	7.4	1996	15.1 Days	CHF 2700
Separations separations	2.5	3.0	2014	15.1 Days	CHF 2600

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All Analytica Energies Materials Molecules Separations

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32 pages, 18593 KiB  

Open AccessArticle

Insights into the Microscopic Oil–Water Flow Characteristics and Displacement Mechanisms during Waterflooding in Sandstone Reservoir Rock Based on Micro-CT Technology: A Pore-Scale Numerical Simulation Study

by Bingtao Hu, Guoliang Chai, Xingjun Liu, Xiaofeng Wen, Zhaolin Gu, Liaobo Xie, Shifeng Han and Junwei Su

Materials 2023, 16(9), 3555; https://doi.org/10.3390/ma16093555 - 6 May 2023

Cited by 3 | Viewed by 2585

Abstract

The low oil recovery rate observed in current oil fields is largely attributed to the presence of remaining oil trapped in the pores of porous media during waterflooding. To improve the recovery rate, it is imperative to gain an understanding of the oil–water [...] Read more.

The low oil recovery rate observed in current oil fields is largely attributed to the presence of remaining oil trapped in the pores of porous media during waterflooding. To improve the recovery rate, it is imperative to gain an understanding of the oil–water flow characteristics and displacement mechanisms during waterflooding, as well as to elucidate the underlying mobilization mechanisms of residual oil at the pore scale. In this paper, we explore these issues in depth by numerically investigating the influence of factors such as water injection velocities, oil–water viscosity ratios, and wettability conditions on pore-scale oil–water flow characteristics and oil recovery rate. To this end, we employ a direct numerical simulation (DNS) method in conjunction with the volume of fluid (VOF) method to study the microscopic displacement mechanisms of waterflooding in a reconstructed two-dimensional digital rock core based on micro-CT technology. In addition, the particle tracing method is adopted to identify the flow path and dominant areas during waterflooding in order to mobilize the residual oil within the pores. The findings indicate that the oil–water flow characteristics in porous media are determined by the interplay between capillary and viscous forces. Furthermore, the oil recovery rate is 10.6% and 24.7% lower under strong water-wet and oil-wet conditions than that (32.36%) under intermediate wettability conditions, and the final oil recovery rate is higher under water-wet conditions than under oil-wet conditions. The seepage path and the dominant areas are directly linked to the capillarity formed during waterflooding. The findings of this study are significant in terms of enhancing the recovery rate of residual oil and provide a novel perspective for understanding the waterflooding process. Full article

(This article belongs to the Topic Application of Aqueous Two-Phase System)

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