For high temperature reservoirs, solid particle foaming stabilizers were commonly used to improve the long-term stability of foam because they were not sensitive to temperature and salinity. Solid particles which could only be dispersed in the solution were easy to agglomerate and sink, and as a result, they could reduce the foaming effect. Consequently, it is necessary to modify the solid particles. The modified solid particles have good dispersion in water, moderate wettability, and can be adsorbed on the gas-liquid interface stably, thus improving the stability of the foam. Nano-silica particles are the most common solid particle foaming stabilizer. The amphiphilic chemically modified nano-silica in this topic was introduced by the reaction of 3-aminopropyltriethoxysilane (APTS) and vapor-phase hydrophilic nano-silica to introduce active amino groups and access the long hydrophobic chain and hydrophilic group on the surface of nano-silica through the substitution reaction. Because amphiphilic molecule was connected to the nano silicon dioxide by chemical bonds, modified nanoparticles adsorption in the bubble liquid film, through the introduction of amphiphilic molecules and foaming agent membrane molecular association, on the one hand, “with” tight liquid film, on the other hand, the “pull” boycott particles flocculated sink, granting the bubble stronger stability. The fabricated nanocomposites were comprehensively characterized including various morphological, compositional and structural characterizations with Fourier Transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and foam performance test under different conditions. Results demonstrated that nanometer SiO₂ was successfully modified, and compared with that before modification, modified SiO₂ had appropriate wettability, better temperature resistance, and the half-life of liquid extract at 100 °C was improved by about 5 min. At last, the enhanced oil recovery of tree distinct foam systems was tested by core flood. The recovery rate of the modified SiO₂ foam system can be increased by 19.8%.

对于高温储层，固体颗粒发泡稳定剂通常用于提高泡沫的长期稳定性，因为它们对温度和盐度不敏感。只能分散在溶液中的固体颗粒易于团聚和下沉，结果，它们会降低发泡效果。因此，有必要对固体颗粒进行改性。改性固体颗粒在水中具有良好的分散性，适度的润湿性，并且可以稳定地吸附在气-液界面上，从而提高了泡沫的稳定性。纳米二氧化硅颗粒是最常见的固体颗粒发泡稳定剂。本主题中的两亲性化学改性纳米二氧化硅是通过3-氨基丙基三乙氧基硅烷（APTS）和气相亲水性纳米二氧化硅的反应引入的，以引入活性氨基并进入纳米级表面上的长疏水链和亲水基团二氧化硅通过取代反应。由于两亲分子通过化学键与纳米二氧化硅相连，因此通过引入两亲性分子和发泡剂膜分子的缔合，修饰的纳米颗粒在气泡液膜中的吸附，一方面“紧密”了液膜，另一方面，“拉动”抵制粒子凝结下沉，使气泡具有更强的稳定性。所制备的纳米复合材料得到了全面的表征，包括各种形态，傅立叶变换红外光谱（FTIR），X射线衍射（XRD），扫描电子显微镜（SEM）和泡沫性能测试在不同条件下的组成和结构表征。结果表明，纳米SiO成功地改性了₂，与改性前相比，改性SiO ₂具有适当的润湿性，更好的耐热性，并且液体提取物在100°C下的半衰期延长了约5分钟。最后，通过岩心驱替测试了树木独特泡沫系统提高的采油率。改性的SiO ₂泡沫体系的回收率可以提高19.8％。