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Title:
Wettability of Supercritical CO2-Brine-Mineral: the Effects of Ion Type and Salinity
Author: Chen C; Zhuang C; Shen WJ(沈伟军); Li WZ; Song YC
Source: Energy & Fuels
Issued Date: 2017-07-19
Volume: 31, Issue:7, Pages:7317-7324
English Abstract:

Deep saline aquifers are considered as perfect storage sites to sequestrate CO2. Interfacial tensions (IFTs) and contact angles (CAs) are key parameters in the heat and mass transfer processes for CO2/brine/mineral systems in porous media. In the present study, a molecular dynamics simulation method was used to investigate the effects of brine salinity and ion type on wettability of CO2/brine/mineral systems at 20 MPa and 318.15 K. Four common brines were selected as NaCl, KCl, CaCl2, and MgCl2. Interfacial tensions, water contact angles, and hydrogen bond structure and dynamics have been analyzed. The effects of brine salinity and ion type on water contact angles were found to be very complicated. For MgCl2 and NaCl solutions, the contact angle increases with salinity. For CaCl2 and KCl solutions, contact angle first increases and then remains constant with salinity. The product of IFT(CO2–brine) and the cosine of CA was found to be constant for all brine solutions studied. In the context of large uncertainty of experimentally measured contact angles, this finding is very useful to predict contact angles using interfacial tension data. Due to the fact that IFT(CO2–brine) × cos(CA) is usually related with capillary pressure and residual trapping capacity, this finding is also very helpful to predict these parameters at different brine conditions. More work is required to study the effects of pressure, temperature, and solid surface structure on this relationship.

Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Chen C
Correspondent Email: congchen@dlut.edu.cn
DOI: doi/pdf/10.1021/acs.energyfuels.7b00840
Related URLs: 查看原文
DOC Type: Article
WOS ID: WOS:000406356600071
ISSN: 0887-0624
Funder: National Natural Science Foundation of China 51206016 51676027 Natural Science Foundation of Liaoning Province 201602147 Fundamental Research Funds for the Central Universities DUT17LAB03
Department: LMFS海洋土力学(LHO)
Classification: 二类/Q1
First Institution (Yes or Not): False
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60722
Appears in Collections:流固耦合系统力学重点实验室(2012-)_期刊论文

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description.institution: 1.Dalian University of Technology
2.Institute of Mechanics, Chinese Academy of Sciences

Recommended Citation:
Chen C,Zhuang C,Shen WJ,et al. Wettability of Supercritical CO2-Brine-Mineral: the Effects of Ion Type and Salinity[J]. Energy & Fuels,2017-07-19,31(7):7317-7324.
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