氮气泡沫体系性能的影响因素实验研究

Experimental Study on the Influence Factors of the Performance of Nitrogen Foam System

采用泡沫扫描仪和界面流变仪分别考察了不同浓度、气液比及温度条件下CHSB体系的泡沫性能,结合泡沫的微观形态特征、界面黏弹性,分析了不同因素对液膜强度、泡沫间聚开、液膜排液之间动态平衡的影响,揭示了泡沫体系在地层孔隙条件下的形成及稳定机理。结果表明:浓度对CHSB体系的起泡性能及稳定性的影响呈现出先增加后减小的趋势,当浓度为0.3%时泡沫形态最致密,稳定性最优;在一定范围内,气液比及温度的增加为泡沫的形成和稳定提供了更多的能量,气液比为4∶1的泡沫体系在30~60℃范围内表现出良好的稳定性,该泡沫体系有望应用于海上油田稳油控水的深部调驱中。

The foam properties of CHSB system under different concentration,gas-liquid ratio and temperature were studied by foam scanner and interface rheometer.Combined with the microscopic morphology and interfacial viscoelasticity of foam,the influence of different factors on the dynamic equilibrium of liquid film strength,foam coalescence and liquid film drainage was analyzed,and the formation and stabilization mechanism of foam system under formation pore conditions were revealed.The results showed that the effect of concentration on the foaming performance and stability of CHSB system increased first and then decreased.When the concentration was 0.3%,the foam morphology was the most compact and the stability was optimal.Within a certain range,the increase of gas-liquid ratio and temperature provided more energy for the formation and stability of foam.The foam system with the gas-liquid ratio of 4∶1 exhibited good stability in the range of 30~60℃.