摘要
近年来,特种工程纳米粒子在提高采收率方面的应用越来越受到人们的重视。提出一种新的方法来修饰二氧化硅纳米颗粒的表面性质,使其更有效地用于提高石油采收率。通过接触角、界面张力测量和岩心驱替实验,考察了表面修饰纳米颗粒对注入水与油藏岩样和油样界面相互作用的影响。为了改善水驱的性能,实验室制备了表面修饰的纳米颗粒,发现胺功能化的二氧化硅纳米颗粒明显比典型的纳米颗粒更有效。结果表明,在功能化纳米粒子的存在下,接触角和界面张力均有较大幅度的降低。岩心驱油试验证实了,与典型的纳米颗粒相比,其总采油率提高了18%。因此,胺功能化二氧化硅纳米粒子可以通过改变储层岩石的润湿性,降低油/水界面张力,比典型的纳米粒子更有效地提高驱油效率。此外,还观察到纳米颗粒降低接触角和界面张力存在一个最佳质量分数,当质量分数超过该阈值时,界面张力开始略有增加。
In recent years, the application of special engineered nanoparticles in enhanced oil recovery has attracted more and more attention. In this paper, a novel approach was presented to modify the surface properties of silica nanoparticles to make them more effective for enhanced oil recovery. The effects of surface-modified nanoparticles on the interaction between injected water and reservoir rock and oil samples were investigated through contact angle,interfacial tension measurements and core flooding experiments. To improve the performance of water flooding,surface-modified nanoparticles were prepared in the laboratory, and it was found that amine-functionalized silica nanoparticles were significantly more effective than typical nanoparticles. The experimental results showed that in the presence of functionalized nanoparticles, the contact angle and interfacial tension were greatly reduced. Core flooding tests confirmed an 18% increase in total oil recovery compared to typical nanoparticles. Therefore,amine-functionalized silica nanoparticles improved oil displacement efficiency more effectively than typical nanoparticles by altering the wettability of reservoir rocks and reducing the oil/water interfacial tension. In addition, it was observed that there was an optimum mass fraction of nanoparticles to reduce the contact angle and interfacial tension, and when the mass fraction exceeded this threshold, the interfacial tension started to increase slightly.
作者
黄克军
HUANG Ke-jun(Yunpanshan Opcration Area of the Fourth Oil Production Plant of PctroChina Changqing Oilficld Branch,Jingbian Couny,Yulin Shaanxi 718500,China)
出处
《当代化工》
CAS
2022年第7期1561-1565,共5页
Contemporary Chemical Industry
基金
中石油重大开发实验项目(项目编号:XTYJ-2020-FW-52857)。
关键词
提高采收率
水驱
润湿性
界面张力
纳米颗粒
Enhanced oil recovery
Water flooding
Wettability
Interfacial tension
Nanoparticles
