一种耐高温高盐水溶性纳米流体的分散稳定性和界面活性

Dispersion Stability and Interfacial Activity of a Water-Soluble Nanofluid in High-temperature and High-salt Environment

以一种水溶性纳米复合材料(SiO_(2)-PAMPS NPs)为研究对象,系统研究了质量分数、温度、盐度对纳米流体的分散稳定性及界面活性的影响规律。研究结果表明,SiO_(2)-PAMPS NPs流体具有良好的耐温耐盐性和降低界面张力的能力,90℃时在API盐水中最佳使用质量分数为0.7%,界面张力值从20.80 mN/m降低至11.38 mN/m,且在高质量分数NaCl盐水中,比高质量分数CaCl_(2)盐水降低油水界面张力的能力更强。该流体能与煤油形成稳定的O/W型乳状液,显示出优异的驱油性能,表明该类纳米流体在高温高盐油藏提高采收率领域具有巨大应用潜力。

A water-soluble nano-composite(SiO_(2)-PAMPS NPs)was used as the research object to systematically study the influences of nanoparticle concentration,temperature and salinity on the dispersion stability and interfacial activity of nanofluid.The results show that SiO_(2)-PAMPS NPs fluid has excellent temperature and salt resistance and the ability to reduce interface tension.The optimal mass fraction of SiO_(2)-PAMPS NPs is 0.7%in API Brine at 90℃,and it can make the interface tension of the brine reduce from 20.80 mN/m to 11.38 mN/m.SiO_(2)-PAMPS NPs has a stronger ability to reduce interface tension in high mass fraction of sodium chloride saline than in high mass fraction of calcium chloride saline.The SiO_(2)-PAMPS NPs fluid can form a stable O/W emulsion with kerosene,demonstrating excellent oil displacement performance,indicating that this type of nanofluid has great potential in the field of enhanced oil recovery in high temperature and high salt reservoirs.