Oil Displacement Performance and Mechanism of a Surfactant-Synergistically Enhanced Inclusion System in High-Temperature and High-Salinity Reservoirs

作者：Bobo Zhou, Zhe Li, Hongbin Yang, Wanli Kang, Yaowen Xing, Xiahui Gui · 发表于：Energy & Fuels · 年份：2025 · DOI：10.1021/acs.energyfuels.5c03908 · 被引用次数：8 · 研究领域：Enhanced Oil Recovery Techniques、Hydraulic Fracturing and Reservoir Analysis、Drilling and Well Engineering

To address the limitations of conventional polymer flooding systems regarding temperature and salt tolerance, a surfactant-synergistically enhanced inclusion system was constructed using zwitterionic surfactants and host–guest inclusion systems, which exhibit excellent temperature and salt resistance, shear recovery properties, and ultralow interfacial tension (IFT, 1.0 × 10 –3 mN/m) reduction capabilities. Under simulated conditions representative of Shengli Oilfield Class-III reservoirs, systematic core flooding experiments employing both homogeneous and heterogeneous physical core models were conducted to evaluate the system’s oil displacement efficacy and profile control performance. Mechanistic investigations encompassing adsorption behavior, wettability alteration capabilities, crude oil emulsification performance, and real-time pore-scale fluid distribution dynamics revealed its enhanced oil recovery (EOR) mechanisms. Results indicate optimal compatibility with homogeneous cores exhibiting permeabilities of approximately 200 × 10 –3 μm 2 . With the increase of injection volume, the increment in oil recovery efficiency increases. When the injection volume is 0.5 PV, the final oil recovery efficiency can reach 60.13%, with an increment of 24.75%. In heterogeneous formations, the system exhibited excellent fluid diversion capability by increasing flow resistance in high-permeability zones and redirecting fluids to low-permeability regions, yielding a 23.85% incremental re...