Study on the Properties of Compound Surfactants with PO Groups
Author:
Wang Biao12, Wang Xue1, Hu Futang3, Wang Xiangyu4, Yang Zhongji1, Zhu Xiuyu3, Li Gen1, Wang Keliang1
Affiliation:
1. Key Laboratory of Enhance Oil and Gas Recovery of Education Ministry, Northeast Petroleum University, Daqing 163318, China 2. The Tenth Oil Production Plant of Daqing Oilfield Co., Ltd., Daqing 166400, China 3. Research Institute of Drilling and Production Technology, Petro China Qinghai Oilfield Company, Dunhuang 736202, China 4. Daqing Qingxin Oilfield Development Co., Ltd., Daqing 151413, China
Abstract
The compound surfactant system has considerable development prospects for improving oil recovery. A synergistic effect can be achieved through the orderly arrangement of the two surfactants on the interface, which can make up for the performance defects of a single surfactant. In this paper, the effects of the number of propylene oxides (PO) in composite surfactants on interfacial tension and emulsion stability were systematically studied. The results showed that the solubility of composite surfactants was significantly improved under high-salinity conditions by adding anionic–nonionic surfactants to a single anionic surfactant. The interfacial tension of composite surfactants shows a V-shaped change of first decreasing and then increasing with the increase in PO groups. As the number of PO groups increases, the emulsion first increases and then decreases. Among the series of composite surfactants, LBAS/C12PO10S has the lowest interfacial tension, reaching the order of 10−3 mN/m, and the emulsion formed by it exhibits superior stability. This indicates that the synergistic effect of the two surfactants can be improved by adjusting the number of PO groups. Furthermore, the LBAS/C12PO10S composite system can be mixed with crude oil to form Winsor III microemulsion, which has great potential for application in enhanced oil recovery via chemical flooding.
Funder
National Natural Science Foundation of China Natural Science Foundation of Heilongjiang Province of China
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
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