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• W4377966952 abstract "Medium- and low-permeability reservoirs are important in oilfield development. However, due to their characteristics of poor pore permeability and high heterogeneity, the development of suitable technologies has been very difficult. In this study, an in situ emulsifying/ultra-low-interfacial-tension cyclic flooding system has been developed for low- and medium-permeability reservoirs. Based on the hydrophilic-lipophilic balance (HLB) value method, an emulsifying surfactant ASD with Span 80 (sorbitan monooleate) as the main component has been identified as highly promising through screening. At mass fractions of surfactant ASD between 0.2% and 0.6%, the extent of water separation from the emulsion is greatly reduced, and the W/O emulsion can effectively improve the mobility ratio and increase the sweep volume. The surfactant SA synthesized in our laboratory reduces the interfacial tension of crude oil to 10−4 mN m−1. Laboratory core flooding experiments have shown that multiple rounds of alternating injection with aqueous solutions of surfactants ASD and SA can improve oil recovery by 22.25%. Upon injecting a low-viscosity aqueous solution of surfactant ASD, it emulsifies crude oil in situ under reservoir conditions, solving the problems of difficult polymer injection and insufficient spread. Our work provides useful insights for the development of low- and medium-permeability reservoirs." @default.
• W4377966952 created "2023-05-25" @default.
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• W4377966952 date "2023-05-24" @default.
• W4377966952 modified "2023-10-18" @default.
• W4377966952 title "Development of an <i>in situ</i> emulsifying/ultra-low-interfacial-tension cyclic flooding system for medium- and low-permeability reservoirs" @default.
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• W4377966952 doi "https://doi.org/10.1080/10916466.2023.2213714" @default.
• W4377966952 hasPublicationYear "2023" @default.
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