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The Wettability Alteration Behavior of Cationic Gemini Surfactants on Oil-aged Mica Mineral Surfaces

  • Rui Zhang , Jinwei Zhou , Lin Peng , Ni Qin and Zhongbin Ye
Published/Copyright: August 16, 2013
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Abstract

The wettability of oil reservoir rock will affect the oil recovery efficiency by reducing the capillary force. A Gemini cationic surfactant containing double dodecyl chains and two quaternary ammonium headgroups was synthetized and used as a new wetting alteration agent. This paper focuses on the wettability alteration of Gemini cationic surfactants on oil-aged mica mineral surface. The results of contact angle data show that Gemini cationic surfactant have great wettability to alter oil-aged mica surfaces to mid-wetting even weakly water-wet. The adsorption morphology by atomic force microscopy shows that the degree of wettability alteration is mainly dependent on the coverage areas of surfactant molecules. Gemini surfactant formed monolayer on oil-aged mica surface and the monolayer has the trend to from a compact film with increasing concentration. Compared with the single chain surfactant, Gemini surfactant has stronger ability to alter oil-aged surfaces. Considering the flooding experiment in lab results, this Gemini surfactant might be a good choice to be used in chemical flooding.

Kurzfassung

Die Benetzung von Gestein in Erdöllagerstätten beeinflusst die Effizienz der Erdölgewinnung durch Reduktion der Kapillarkräfte. Es wurde ein Geminitensid bestehend aus zwei Dodecylketten und zwei quaternären Ammoniumkopfgruppen synthetisiert, das als ein neues Reagenz zum Wechsel der Benetzbarkeit eingesetzt wurde. Diese Arbeit konzentriert sich auf die Änderung der Benetzbarkeit des kationischen Geminitensids auf ölgealterten Glimmeroberflächen. Die Ergebnisse der Kontaktwinkelmessungen zeigen, dass das kationische Geminitensid ein so hohes Benetzungsvermögen besitzt, um die Benetzung von ölgealterten Glimmeroberflächen durch Wasser von mittel auf schwach zu ändern. Die mit der Rasterkraftmikroskopie bestimmte Adsorptionsmorphologie hängt hauptsächlich von der Flächenbedeckung der Tensidmoleküle ab. Das Geminitensid bildet auf der ölgealterten Glimmeroberfläche eine Monoschicht aus, die mit steigender Konzentration die Tendenz hat, einen kompakten Film zu bilden. Im Vergleich zu einem Tensid mit nur einer hydrophoben Kette kann das Geminitensid eine ölgealterte Glimmeroberfläche stärker verändern. Betrachtet man die Laborergebnisse im Hinblick auf Tensidflutungsexperimente, so scheint dieses Geminitensid eine gute Wahl für den Einsatz beim chemischen Fluten zu sein.


* Correspondence address, Rui Zhang, Xindu Main Road 8#, Xindu District, Chengdu, 610500, P. R. China, Tel.: +86-0 28-83 03 28 07, Fax: +86-0 28-83 03 29 01, E-Mail:

Dr. Rui Zhang is the corresponding author of this paper. She was born in 1979 and got her Ph. D. in 2008 from the Chinese academy of sciences. And she obtained faculty job in the southwest petroleum university. Her work focuses on the Enhanced Oil Recovery and carried on the synthesis and application on the surfactant and polymer.

Jinwei Zhou, Lin Peng, Ni Qin and Zhongbin Ye are all the team members.


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Received: 2012-10-24
Published Online: 2013-08-16
Published in Print: 2013-05-15

© 2013, Carl Hanser Verlag, Munchen

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