The application of nanomaterials in petroleum industry is becoming common. Nanofluids are used as the water phase in the process of water alternating gas injection. Previous studies mainly focused on the effect of nanoparticles on the pore throat properties of porous media or the effect of nanofluids on crude oil emulsification. However, in the process of water gas alternating displacement, the relative flow of water and gas affects the displacement front and gas breakthrough time. Therefore, it is significant to study the effect of nanoparticles on mass transfer at gas-liquid interface. Based on the good dispersion and unique physical properties of nanoparticles in the base solution, in the process of alternating injection of CO₂ and water, water is used as the base solution and nanoparticles are added to form a uniformly dispersed nanofluid. In this study, the enhancement of mass transfer by nanoparticles at the gas-liquid interface was studied. The theoretical model of the micro mass transfer at the gas-liquid interface during the percolation of nanofluid and CO₂ in porous media was deduced. Combined with the absorption experiment of CO₂ mixture, the enhancement effect of nanoparticles on mass transfer process was verified. Different factors affecting CO₂ absorption were also compared. The main fluids used in the experiment were deionized water, SiO₂, TiO₂ and Al₂O₃ nanofluids. The experimental results of different nanofluids show that TiO₂ nanoparticles enhance the mass transfer most obviously, and SiO₂ inhibits the mass transfer when the content exceeds a certain content. In addition, the optimum absorption concentrations of the three nanoparticles are in the range of 0.06–0.08 wt‰. Combined with the relative permeability experiment, the influence of nanoparticles on the law of gas-liquid relative permeability is further revealed. This experimental result provides a theoretical guidance for the application of nanoparticles in enhancing oil recovery.

纳米材料在石油工业中的应用越来越普遍。纳米流体在水交替气体注入过程中用作水相。以往的研究主要集中在纳米粒子对多孔介质孔喉特性的影响或纳米流体对原油乳化的影响。但在水气交替驱替过程中，水气的相对流动影响驱替前沿和气突破时间。因此，研究纳米粒子对气液界面传质的影响具有重要意义。基于纳米粒子在基础溶液中的良好分散性和独特的物理性质，在交替注入CO _{2的过程中}和水，以水为基础溶液，加入纳米颗粒，形成均匀分散的纳米流体。在这项研究中，研究了纳米粒子在气液界面处对传质的增强作用。_{推导了纳米流体和CO 2}在多孔介质中渗滤过程中气液界面微量传质的理论模型。结合CO ₂混合物的吸收实验，验证了纳米粒子对传质过程的增强作用。还比较了影响CO _{2吸收的不同因素。}实验中使用的主要流体是去离子水、SiO ₂、TiO ₂和Al ₂ O ₃纳米流体。不同纳米流体的实验结果表明，TiO ₂纳米粒子对传质的促进作用最为明显，而SiO ₂在含量超过一定含量时会抑制传质。此外，三种纳米粒子的最佳吸收浓度在0.06-0.08 wt‰范围内。结合相对渗透率实验，进一步揭示纳米粒子对气液相对渗透率规律的影响。该实验结果为纳米颗粒在提高采收率中的应用提供了理论指导。