摘要
用改性SiO_(2)纳米颗粒配制了SiO_(2)纳米流体,利用表面张力、界面张力(IFT)、接触角测试等方法研究了SiO_(2)纳米颗粒含量对SiO_(2)纳米流体性能的影响,并在固液相互作用的界面尺度上,以杨氏方程为基础,探讨了纳米流体启动残余油的热力学机制。实验结果表明,随SiO_(2)纳米颗粒含量的增大,SiO_(2)纳米流体与模拟油之间的IFT先迅速下降后小幅上升、水相接触角先减小后增大,当SiO_(2)纳米颗粒含量为0.2%(w)时,IFT最低为0.572 mN/m、水相接触角降至67°、岩石片润湿性由亲油转变为亲水。SiO_(2)纳米流体启动残余油的热力学过程实际上是SiO_(2)纳米流体降低油-水界面能和固-水界面能,进而导致油滴向内收缩、接触角变大的过程,该过程为自发进行,动力来源为降低的Gibbs自由能。
SiO_(2)nanofluid was prepared using modified SiO_(2)nanoparticles,and the influence of SiO_(2)nanoparticle content on the SiO_(2)nano-fluid performance was investigated by measuring the surface tension,interfacial tension(IFT),and contact angle. Based on the Young equation,the thermodynamic mechanism of oil mobilization by nano-fluid was discussed at the solid-liquid interaction interface scale. The experiment results showed that as the SiO_(2)nanoparticle content increased,the IFT and water contact angle decreased first and then increased. When the SiO_(2)nanoparticle content was 0.2%(w),the IFT and water contact angle reached their lowest,which were 0.572 mN/m and 67° respectively,and the wettability shifted from oil-wet to water-wet. The oil mobilization by SiO_(2)nano-fluid was actually a process in which SiO_(2)nano-fluid reduced the energy of oil-water and solid-water interfaces,causing the oil drop to shrink and the oil contact angle to increase consequently. This process occurred spontaneously,with the diminished Gibbs free energy acting as the driving force.
作者
尚丹森
伊卓
刘希
胡晓娜
杨金彪
李雅婧
Shang Dansen;Yi Zhuo;Liu Xi;Hu Xiaona;Yang Jinbiao;Li Yajing(Sinopec Beijing Research Institute of Chemical Industry,Beijing 100013,China)
出处
《石油化工》
CAS
CSCD
北大核心
2022年第12期1438-1442,共5页
Petrochemical Technology
基金
中国石油化工股份有限公司项目(G6001-20-ZS-0455)。
关键词
纳米流体驱
残余油
三次采油
提高采收率
nano-fluid flooding
remaining oil
tertiary recovery
enhanced oil recovery
