Experimental investigation on the enhanced oil recovery efficiency of polymeric surfactant: Matching relationship with core and emulsification ability

作     者：Xin Chen Yi-Qiang Li Zhe-Yu Liu Japan Trivedi Wen-Bin Gao Ming-Yue Sui 

作者机构：State Key Laboratory of Oil and Gas Resources and ExplorationSchool of Petroleum EngineeringChina University of Petroleum(Beijing)Beijing 102249China Faculty of Engineering-Civil and Environmental EngineeringUniversity of AlbertaEdmontonAlberta T6G 2R3Canada Institute of Rock and Soil MechanicsChinese Academic of SciencesWuhanHubei 430071China PetroChina Changqing Oilfield Co Research Institute of Oilfield Exploration and DevelopmentXianShaanxi 710018China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2023年第20卷第1期

页      面：619-635页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0703[理学-化学] 082002[工学-油气田开发工程] 

基　　金：The work was supported by the National Natural Science Foundation of China(Grant 52074318) the Science Foundation of China University of Petroleum,Beijing(No.2462022BJRC005) Ningbo 2025 Project(2019B10138) the China Scholarship Council(No.202106440061) China University of Petroleum,Beijing,and the University of Alberta. 

主　　题：Migration Matching relationship Viscosity retention ratio Emulsion EOR 

摘      要：The polymeric surfactant can be used as an efficient agent for enhanced oil recovery(EOR)because of its large bulk viscosity and good interfacial activity.However,there is a sparse understanding of its matching relationship with reservoirs and emulsification occurrence conditions,which may affect its migration and EOR efficiency.One intermolecular association molecule polymeric surfactant(IAM)was synthesized by micellar polymerization and characterized with 1 H NMR,FTIR,and TGA.The matching relationship between IAM and reservoirs was evaluated by comparing the viscosity retention rate of effluent in the core flow experiments.Moreover,the effect of the matching relationship on EOR in the heterogeneous reservoir was clarified with parallel core displacement experiments by considering different flow abilities of IAM in the high-permeability layer.The occurrence conditions of in-situ emulsification of IAM were evaluated via oil-water co-injection experiments under the different injection rates and oil-water ratios.Microscopic visualization displacement was carried out to compare the micro EOR mechanisms of different chemical systems.The results show that IAM features thickening,shearing resistance,viscoelasticity,thermal stability,and interfacial activity.The matching relationship between cores and IAM could be divided as hardly injected,flow limited,and flow smoothly,corresponding to the viscosity retention ratio of80%,respectively.IAM could gain better EOR efficiency(17.69%)when its matching relationship to the high permeability layer was“flow limited.The defined mixture capillary number shows that only when it is greater than 1×10^(3),the in-situ emulsions can be generated.Compared to HPAM,IAM could reduce IFT and form vortices to more effectively displace film and corner remaining oils by stripping and peeling off crude oil.The formed emulsion accumulated at the pore throat could further increase flow resistance,which benefits swept area enlargement.This work could provide theoretical and data support for the parameters design in the polymeric surfactant practical application.