Accessible Unlicensed Requires Authentication Published by De Gruyter November 13, 2017

Study of the Complex System of Fatty Alcohol Polyoxyethylene Ether Carboxylate and Alkyl Betaine for Heavy Oil Recovery

Studie des komplexen Systems aus Fettalkohol-Polyoxyethylenethercarboxylat und Alkylbetain für die tertiäre Erdölförderung
Hujun Xu and Yuanhong Xu

Abstract

The properties of the surface and the interface of the complex system of hexadecyl/octadecyl alcohol polyoxyethylene ether carboxylate with 3 ethoxy groups and octadecyl dimethyl carboxyl betaine were investigated. The complex system had a good synergistic effect and could reduce the Shengli Oilfield crude oil/water interfacial tension (IFT) to 10−3 mN m−1 in a wide total surfactant concentration with less amount of hexadecyl/octadecyl alcohol polyoxyethylene ether carboxylate. In addition, we explored the effect of the salinity and divalent ion concentration on the interfacial tension (IFT) of the complex system. The results showed that the complex system can be used in the oil field when the salinity is lower than 50 000 mg · L−1 and the molar ratio of octadecyl dimethyl carboxyl betaine/hexadecyl/octadecyl alcohol polyoxyethylene ether carboxylate is 9: 1.

Kurzfassung

Die chemischen Oberflächen- und Grenzflächeneigenschaften des komplexen Systems aus Hexadecyl-/Octadecylalkohol-Polyoxyethylenethercarboxylat (mit 3 Ethoxygruppen) und Octadecyldimethylcarboxylbetain wurden untersucht. Das komplexe System hatte einen guten synergistischen Effekt und konnte die Grenzflächenspannung (IFT) zwischen dem Rohöl des Shengli Úlfelds und Wasser in einem breiten Bereich der Gesamttensidkonzentration bei einer geringeren Menge an Hexadecyl-/Octadecylalkohol-Polyoxyethylenethercarboxylat bis auf 10−3 mN m−1 reduzieren. Darüber hinaus wurde der Einfluss des Salzgehalts und der Konzentration der zweiwertigen Ionen auf die Grenzflächenspannung (IFT) des komplexen Systems untersucht. Die Ergebnisse zeigten, dass das komplexe System im Ölfeld verwendet werden kann, wenn der Salzgehalt niedriger als 50 000 mg L−1 ist und das Molverhältnis von Octadecyldimethylcarboxylbetain/Hexadecyl-/Octadecylalkohol-Polyoxyethylenethercarboxylat 9: 1 beträgt.


*Correspondence address, Dr. Yuanhong Xu, School of Chemical and Material Engineering, Jiangnan University, Lihu Avenue, Wuxi 214122, China, Tel.: +8618762673002, E-Mail:

Hujun Xu: An associate professor at Jiangnan University, who received Ph. D.degree in 2005 from Nanjing University of Science and Technology. He has been involved in surfactants and detergents for over 30 years. He has published over 90 papers in the field of surfactants and detergents.

Yuanhong Xu: A postgraduate at Jiangnan University and is currently engaged in researching various surfactant application and synthesis.


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Received: 2016-09-05
Accepted: 2016-11-25
Published Online: 2017-11-13
Published in Print: 2017-11-15

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