화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.89, 316-333, September, 2020
DOI10.1016/j.jiec.2020.05.027  Export Citation
Experimental investigation on the complex chemical reactions between clay minerals and brine in low salinity water-flooding
Youngmin Kim, Changkyun Kim, Jihwan Kim, Youngdoo Kim1, †, and Jeonghwan Lee†
  • Department of Energy and Resources Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
  • 1Department of Resources and Energy Engineering, Chonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea
E-mail:,
This paper presents a dynamic effect of clay types and content on low salinity water-flooding (LSF) based on coreflooding experiments. The EDL (electrical double layer) expansion, MIE (multicomponent ion exchange), local pH increase between clay minerals and brine are investigated to get a better understanding on the complexity of role of clay in LSF. The results of coreflooding experiments using unconsolidated core sample show that the incremental oil recovery of kaolinite is higher than that of illite at the same clay content. Kaolinite and illite have a positive effect on MIE, EDL expansion, and local pH increase. The incremental oil recovery was proportional to the local pH increase in both core samples. Especially, more MIE and EDL expansion occur in kaolinite core samples. Therefore, the wettability is further changed to the water-wet condition in kaolinite sample. The results of correlation coefficient analysis show the kaolinite content has a strong correlation with MIE, EDL expansion, local pH increase, and oil recovery. On the other hand, the correlations between oil recovery and chemical reactions in illite samples are relatively low compared to the kaolinite samples excepting local pH increase. Therefore, the sandstone reservoir containing kaolinite is more suitable for the LSF.
Keywords:Low salinity water-flooding;Clay minerals;Wettability alteration;Electrical double layer expansion;Multicomponent ion exchange;Local pH increase
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