SiO_(2)纳米基CO_(2)泡沫驱效果影响因素分析

Analysis of influencing factors of CO_(2) foam flooding based on nanoparticles

通过进行CO_(2)泡沫驱替岩心试验,考察了不同电解质浓度和试验温度对SiO_(2)纳米微粒修饰后CO_(2)泡沫体系稳定性和流变性影响。试验结果表明:当加入w(NaCl)从1%增加到15%时,驱替体系产生泡沫量明显增加,破裂完全用时显著延长,泡沫稳定性增加,同时泡沫流度下降;对于多种离子通过协同效应影响CO_(2)泡沫体系时,体系产生泡沫量显著增加,但是由于不同金属离子对纳米微粒表面双电层影响不同形成不平衡效应,导致泡沫体系稳定性下降。该试验结果可以为CO_(2)泡沫体系的配制及CO_(2)泡沫驱矿场应用提供理论依据。

The effect of different electrolyte concentration and test temperature on the stability and rheological properties of CO_(2)foam system modified by SiO_(2)nanoparticles is investigated through CO_(2)foam flooding core test.The experimental results show that when the mass fraction of NaCl increases from 1%to 15%,the foam volume of the displacement system increases significantly,the complete rupture time is prolonged significantly,the stability of foam increases,and the mobility of foam decreases.When the CO_(2)foam system is affected by various ions,the foam volume increases significantly.However,the effect of different metal ions on the electric double layer of nanoparticles is different,which leads to the decrease of foam stability.The test results can provide theoretical basis for the preparation of CO_(2)foam system and the application of CO_(2)foam flooding.