Synergistic anionic/zwitterionic mixed surfactant system with high emulsification efficiency for enhanced oil recovery in low permeability reservoirs  

作　　者：Hai-Rong Wu Rong Tan Shi-Ping Hong Qiong Zhou Bang-Yu Liu Jia-Wei Chang Tian-Fang Luan Ning Kang Ji-Rui Hou 

机构地区：[1]National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum-Beijing,Beijing,102249,China [2]Unconventional Petroleum Research Institute,China University of Petroleum-Beijing,Beijing,102249,China [3]Gas Production Plant 5 of PetroChina Changqing Oilfield Company,PetroChina,Xi'an,710000,Shaanxi,China [4]College of Petroleum Engineering,China University of Petroleum-Beijing,Beijing,102249,China [5]College of Science,China University of Petroleum-Beijing,Beijing,102249,China [6]Kazakh-British Technical University,Almaty,050000,Kazakhstan

出　　处：《Petroleum Science》2024年第2期936-950,共15页石油科学（英文版）

基　　金：financially supported by National Natural Science Foundation of China(No.22302229);Beijing Municipal Excellent Talent Training Funds Youth Advanced Individual Project(No.2018000020124G163)。

摘　　要：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.

关 键 词：Anionic/zwitterionic mixed surfactant system EMULSIFICATION Synergistic effect Low permeability reservoir Enhanced oil recovery 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]