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Journal of Chemistry
Volume 2013, Article ID 275943, 6 pages
http://dx.doi.org/10.1155/2013/275943
Research Article

Alkali/Surfactant/Polymer Flooding in the Daqing Oilfield Class II Reservoirs Using Associating Polymer

1State Key Laboratory of Oil and Gas Reservoirs Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2School of Chemistry and Chemical Engineering of Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received 4 April 2013; Accepted 20 June 2013

Academic Editor: Ibnelwaleed Ali Hussien

Copyright © 2013 Ru-Sen Feng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Hydrophobically modified associating polyacrylamide (HAPAM) has good compatibility with the Daqing heavy alkylbenzene sulfonate surfactant. The HAPAM alkali/surfactant/polymer (ASP) system can generate ultralow interfacial tension in a wide range of alkali/surfactant concentrations and maintain stable viscosity and interfacial tension for 120 days. The HAPAM ASP system has good injectivity for the Daqing class II reservoirs (100–300 × 10−3μm2) and can improve oil recovery by more than 25% on top of water flooding. In the presence of both the alkali and the surfactant, the surfactant interacts with the associating groups of the polymer to form more micelles, which can significantly enhance the viscosity of the ASP system. Compared with using HPAM (  MDa), using HAPAM can reduce the polymer use by more than 40%.