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Production characteristics and displacement mechanisms of infilling polymer-surfactant-preformed particle gel flooding in post-polymer flooding reservoirs:A review of practice in Ng3 block of Gudao Oilfield

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Petroleum Science 2023年第4期20卷 2354-2371页

作者： Zhi-Bin An Kang Zhou De-Jun Wu Jian Hou Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPR China College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao266590ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China

The pilot test of infilling polymer-surfactant-preformed particle gel(PPG)flooding has been successfully implemented after polymer flooding in Ng3 block of Gudao Oilfield in ***,the production characteristics and displacement mechanisms are still unclear,which restricts its further popularization and *** at this problem,this paper firstly analyzes the production performance of the pilot test and proposed four response types according to the change of water cut curves,including W-type,U-type,V-type response,and no ***,the underlying reasons of these four types are analyzed from the aspects of seepage resistance and sweep *** overall sweep efficiency of gradual-rising W-type,gradual-decreasing W-type,and early V-type response increases from 0.81 to 0.93,0.55 to 0.89,and 0.94 to 1,*** the sum of seepage resistance along the connection line between production well and injection well for U-type and delayed V-type response increases from 0.0994 to 0.2425,and 0.0677 to 0.1654,***,the remaining oil distribution after polymer flooding is summarized into four types on the basis of production and geological characteristics,namely disconnected remaining oil,streamline unswept remaining oil,rhythm remaining oil,and interlayer-controlled remaining ***,the main displacement mechanisms for each type are clarified based on the dimensionless seepage resistance and water absorption ***,improving connectivity by well pattern infilling is the most important for producing disconnected remaining *** synergistic effect of well pattern infilling and polymer-surfactant-PPG flooding increases the dimensionless seepage resistance of water channeling regions and forces the subsequent injected water to turn to regions with streamline unswept remaining *** improvement of the water absorption profile by polymer-surfactant-PPG flooding and separated layer water injection contributes to

关键词： Infilling polymer-surfactant-PPG flooding Production characteristics Displacement mechanisms dimensionless seepage resistance Water absorption profile

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