Abstract
Chemical combination flooding is one of the main enhanced oil recovery (EOR) techniques in China. The key factor of a successful chemical combination flooding application is the development of oil displacement surfactants with good performance. In this paper, the basic requirements of surfactant for chemical combination flooding were introduced, and the development progress of surfactants for chemical combination flooding was reviewed and their application results were shown. With the expanding application of chemical combination flooding in different types of reservoir, the challenge and development direction of oil displacement surfactants were indicated.
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