Synergistic anionic/zwitterionic mixed surfactant system with high emulsification efficiency for enhanced oil recovery in low permeability reservoirs
Wu H.-R. Tan R. Hong S.-P. Zhou Q. Liu B.-Y. Chang J.-W. Luan T.-F. Kang N. Hou J.-R.
April 2024KeAi Communications Co.
Petroleum Science
2024#21Issue 2936 - 950 pp.
Emulsification is one of the important mechanisms of surfactant flooding. To improve oil recovery for low permeability reservoirs, a highly efficient emulsification oil flooding system consisting of anionic surfactant sodium alkyl glucosyl hydroxypropyl sulfonate (APGSHS) and zwitterionic surfactant octadecyl betaine (BS-18) is proposed. The performance of APGSHS/BS-18 mixed surfactant system was evaluated in terms of interfacial tension, emulsification capability, emulsion size and distribution, wettability alteration, temperature-resistance and salt-resistance. The emulsification speed was used to evaluate the emulsification ability of surfactant systems, and the results show that mixed surfactant systems can completely emulsify the crude oil into emulsions droplets even under low energy conditions. Meanwhile, the system exhibits good temperature and salt resistance. Finally, the best oil recovery of 25.45% is achieved for low permeability core by the mixed surfactant system with a total concentration of 0.3 wt% while the molar ratio of APGSHS:BS-18 is 4:6. The current study indicates that the anionic/zwitterionic mixed surfactant system can improve the oil flooding efficiency and is potential candidate for application in low permeability reservoirs.
Anionic/zwitterionic mixed surfactant system , Emulsification , Enhanced oil recovery , Low permeability reservoir , Synergistic effect
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National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum-Beijing, Beijing, 102249, China
Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing, 102249, China
Gas Production Plant 5 of PetroChina Changqing Oilfield Company, PetroChina, Shaanxi, Xian, 710000, China
College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing, 102249, China
College of Science, China University of Petroleum-Beijing, Beijing, 102249, China
Kazakh-British Technical University, Almaty, 050000, Kazakhstan
National Key Laboratory of Petroleum Resources and Engineering
Unconventional Petroleum Research Institute
Gas Production Plant 5 of PetroChina Changqing Oilfield Company
College of Petroleum Engineering
College of Science
Kazakh-British Technical University
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