高效深度调剖化学剂在提高采收率中的应用及机理研究

Application and Mechanism Research of High-efficiency Depth Profile Control Chemicals in Improving Oil Recovery

通过高效液相色谱分析、界面张力仪测量、岩心驱替实验和扫描电子显微镜观察等实验方法,探究了高效深度调剖化学剂在提高采收率中的应用及其作用机理。结果表明:该化学剂主要由交联聚合物(58.6%)、表面活性剂(29.5%)和纳米粒子(11.9%)组成,具有良好的流变性能和热稳定性。化学剂在25℃时的黏度为121.6 mPa·s,随温度升高而降低,但在100℃时仍保持58.3 mPa·s的黏度;化学剂能显著降低油水界面张力,从32.6 mN·m^(-1)降至9.6 mN·m^(-1);在岩心驱替实验中,使用该化学剂后的额外采收率达到了19.2%,总采收率提高到47.8%,最佳的注入参数组合为化学剂质量分数0.5%,注入速率0.5 mL·min^(-1),注入量1.0 PV。机理分析表明,该化学剂通过降低油水界面张力、改善油藏渗透性、调整流动阻力和改变孔隙结构等多重机制,有效提高了采收率。该研究为油田的高效开发提供了新的技术支持,对于提高油田采收率具有重要的理论意义和应用价值。

The application and mechanism of high-efficiency depth profile control chemicals in improving oil recovery were explored through experimental methods such as high-performance liquid chromatography,interfacial tensiometer measurement,core displacement experiments,and scanning electron microscope observations.Research results showed that the chemical agent was mainly composed of cross-linked polymer(58.6%),surfactant(29.5%)and nanoparticles(11.9%),and had good rheological properties and thermal stability.The viscosity of the chemical agent at 25℃ was 121.6 mPa:s,which decreased as the temperature increased,but still maintained a viscosity of 58.3 mPa's at 100℃;the chemical agents could significantly reduce the oil-water interfacial tension from 32.6 mN·m^(-1)to 9.6 mN·m^(-1).In the core flooding experiment,the additional recovery rate after using this chemical agent reached 19.2%,and the total recovery rate was increased to 47.8%;in addition,the optimal injection parameter combination was a chemical agent mass fraction of 0.5% and an injection rate of 0.5 mL·min^(-1),injection volume 1.0 PV.Mechanism analysis showed that this chemical agent effectively improved oil recovery through multiple mechanisms such as reducing oil-water interfacial tension,improving reservoir permeability,adjusting flow resistance,and changing pore structure.This research provides new technical support for the efficient development of oil fields and has important theoretical significance and application valuefor improving oil field recovery.