Probing the mechanism of in situ oil droplet swelling during low salinity water flooding

被引:9
作者
Huang, Yongping [1 ,2 ]
Dai, Caili [1 ,2 ]
Chen, Zhixue [3 ]
Cao, Mengjiao [1 ,2 ]
Liu, Qixin [1 ,2 ]
Chu, Zhongzhong [1 ,2 ]
Yuan, Ye [4 ]
Wu, Yining [1 ,2 ]
机构
[1] China Univ Petr East China, Sch Petr Engn, Shandong Key Lab Oilfeld Chem, Qingdao 266580, Peoples R China
[2] China Univ Petr East China, State Key Lab Heavy Oil Proc, Coll Chem Engn, Qingdao 266580, Peoples R China
[3] CNPC Engn Technol R&D Co Ltd, Beijing 102206, Peoples R China
[4] Oil & Gas Field Prod Construct Dept TOC, Urumqi 841599, Xinjiang, Peoples R China
基金
中国国家自然科学基金;
关键词
Oil droplet swelling; Osmotic pressure; Low salinity water flooding; Enhanced oil recovery; CRUDE-OIL; FINES MIGRATION; RECOVERY; WETTABILITY; DIFFUSION; PH;
D O I
10.1016/j.colsurfa.2021.128133
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Low salinity water (LSW) flooding has been widely used to enhance oil recovery due to its low cost. The phenomenon of oil droplets swelling was discovered during the LSW flooding, which was deemed important for enhancing oil recovery. However, whether and how the swelling of oil droplets was driven by osmotic pressure have not been fully understood. In this paper, instrument built by our laboratory was used to record the volume of individual oil droplet in real time, analyze the influencing factors and swelling rule of oil droplet, explore the swelling mechanism. In addition, the contribution of oil droplet swelling to enhanced oil recovery was demonstrated by core displacement experiments. The results show that osmotic pressure, oil soluble surfaceactive agents and original water content of oil droplet are the necessary prerequisites for the swelling of oil droplet. The maximum swelling ratio of oil droplet reached 3.60 times and oil recovery improved by 5.16%. The diffusion of water molecules into inside of oil droplet was the basic reason of oil droplet swelling. Osmotic pressure was the driving force of water molecules diffusion, oil-soluble surfactant was the transport medium of water molecules through oil film, and water content in oil droplet dominated the final equilibrium state of water molecules diffusion. Our results would be helpful for subsequent researchers to further explored LSW flooding for enhancing oil recovery.
引用
收藏
页数:7
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