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

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外文摘要：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 sur-factant 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.

外文关键词：

Anionic/zwitterionic mixed surfactant systemEmulsificationSynergistic effectLow permeability reservoirEnhanced oil recovery

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

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作者单位：

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,Xi'an,710000,Shaanxi,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

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基金：

国家自然科学基金Beijing Municipal Excellent Talent Training Funds Youth Advanced Individual Project

项目编号：

223022292018000020124G163

出版年：

2024

DOI：

10.1016/j.petsci.2023.12.023

石油科学(英文版)

中国石油大学（北京）

石油科学(英文版)

影响因子：0.88

ISSN：1672-5107

年,卷(期)：2024.21(2)