Construction and Evaluation on Efficient Imbibition System Composed of Salt-Resistant Anionic/Cationic Surfactant
According to the reservoir conditions of Ansai Oilfield in Changqing, a salt-tolerant and high-efficiency imbibition system composed of anionic surfactant APGSHS and dioctadecyl cationic surfactant was constructed. Under the condition of 74.11 g·L-1 salinity and 50 ℃, the interfacial tension was used to select the most suitable reservoir imbibition system for the oilfield. Then the wettability, emulsification performance and imbibition oil recovery efficiency of the system were studied. The results showed that the interfacial tension of the composite system could maintain the oil-water interfacial tension in the order of 10-3 mN·m-1. Meanwhile, the system displayed excellent wetting alternation ability and better emulsification performance, and the recovery ratio anion and cation composite system for 0.3～30.0 mD core imbibition recovery rate could reach more than 40％. The current work provides theoretical guidance for the development of low permeability reservoir with high salinity.
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