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A Study of Relationship Between Oil-Water Interfacial Dilational Rheology and Oil Recovery of Alkaline Flooding

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Published/Copyright: July 9, 2015
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Abstract

In order to find out the influence of dilational rheology on chemical flooding systems, the dilational rheology of Zhuangxi crude oil/NaOH solutions interface was investigated by DSA100 interfacial dilatational rheometer (KRÜSS, Germany). The results show that the alkaline system, which can enhance oil recovery, mainly depends on its interfacial dilational rheology, rather than interfacial tension. The greater the interfacial dilational elasticity, the higher the oil recovery is. The greater the interfacial dilational viscosity, the lower the oil recovery is. The conclusion is consistent with the change of displacement pressure in the macro displacement experiment and the change of sweep efficiency in the microscopic displacement experiment.

Kurzfassung

Um den Einfluss der Ausdehnungsrheologie auf chemische Flutungssysteme herauszufinden, wurde die Dehnungsrheologie der Grenzfläche zwischen Zhuangxi-Rohöl und NaOH-Lösungen mittels eines Grenzflächenausdehnungsrheometers (DSA100, Krüss, Deutschland) untersucht. Die Ergebnisse machen deutlich, dass ein alkalisches System, das die Erdölgewinnung verbessern kann, hauptsächlich von seiner Grenzflächendehnungsrheologie und weniger von der Grenzflächenspannung abhängt. Je größer die Grenzflächendehnungselastizität ist, umso höher ist die Erdölgewinnung. Je größer die Grenzflächendehnungsviskosität ist, umso geringer ist die Erdölgewinnung. Dieser Schluss ist konsistent mit der Änderung des Verdrängungsdrucks in dem makroskopischen Verdrändungsexperiment und der Änderung des Durchlaufwirkungsgrades im mikroskopischen Verdrändungsexperiment.


*Correspondence address, Dr. Yang Wang, School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, P. R. China, E-Mail:

Yang Wang, doctor candidate of China University of Petroleum (East China), main direction of studying is oilfield chemistry and EOR.

Jijiang Ge, professor of China University of Petroleum (East China), main direction of studying is oilfield chemistry and EOR.

Yufei Zheng, assistant engineer of China Oilfield Services Limited, main direction of studying is oilfield chemistry and EOR.

Ping Jiang, associate professor of China University of Petroleum (East China), main direction of studying is oilfield chemistry and EOR.

Guicai Zhang, professor of China University of Petroleum (East China), main direction of studying is oilfield chemistry and EOR.


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Received: 2014-07-24
Accepted: 2015-01-03
Published Online: 2015-07-09
Published in Print: 2015-07-15

© 2015, Carl Hanser Publisher, Munich

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