Study on the Properties of Compound Surfactants with PO Groups

Biao Wang, Xue Wang, Futang Hu, Xiangyu Wang, Zhongji Yang, Xiuyu Zhu, Gen Li and Keliang Wang ()
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Biao Wang: Key Laboratory of Enhance Oil and Gas Recovery of Education Ministry, Northeast Petroleum University, Daqing 163318, China
Xue Wang: Key Laboratory of Enhance Oil and Gas Recovery of Education Ministry, Northeast Petroleum University, Daqing 163318, China
Futang Hu: Research Institute of Drilling and Production Technology, Petro China Qinghai Oilfield Company, Dunhuang 736202, China
Xiangyu Wang: Daqing Qingxin Oilfield Development Co., Ltd., Daqing 151413, China
Zhongji Yang: Key Laboratory of Enhance Oil and Gas Recovery of Education Ministry, Northeast Petroleum University, Daqing 163318, China
Xiuyu Zhu: Research Institute of Drilling and Production Technology, Petro China Qinghai Oilfield Company, Dunhuang 736202, China
Gen Li: Key Laboratory of Enhance Oil and Gas Recovery of Education Ministry, Northeast Petroleum University, Daqing 163318, China
Keliang Wang: Key Laboratory of Enhance Oil and Gas Recovery of Education Ministry, Northeast Petroleum University, Daqing 163318, China

Energies, 2024, vol. 17, issue 2, 1-16

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/C 12 PO 10 S 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/C 12 PO 10 S 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.

Keywords: compound system; interfacial tension; salt solubility; microemulsion; emulsion stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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