Nanoparticle-induced drag reduction for polyacrylamide in turbulent flow with high Reynolds numbers  

作　　者：Xiaoping Li Jiaxin Pan Jinwen Shi Yanlin Chai Songwei Hu Qiaorong Han Yanming Zhang Xianwen Li Dengwei Jing 

机构地区：[1]State Key Laboratory of Multiphase Flow in Power Engineering&International Research Center for Renewable Energy,Xi'an Jiaotong University,Xi'an 710049,China [2]Oil and Gas Technology Research Institute of Petrochina Changqing Oilfield Company,Xi'an 710018,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第4期290-298,共9页中国化学工程学报（英文版）

基　　金：the financial supports of the National Natural Science Foundation of China (51961130386);the National Science Fund for Distinguished Young Scholars (52025061);supported by the China Fundamental Research Funds for the Central Universities。

摘　　要：Although having been increasingly studied, there is still controversy as to when the addition of nanoparticles could improve the drag reduction performance of polymer drag reducer and particularly what is the underlying mechanism from the fluid dynamics viewpoint. The drag reduction effects of adding SiO_(2) nanoparticles to various polymer polyacrylamide(PAM) solutions were examined in this work.The optimal combination of SiO_(2) nanoparticles with cationic polyacrylamide was confirmed.Interestingly,the addition of SiO_(2) nanoparticles to cationic polyacrylamide solution was shown to be quite efficient for reducing drag, but only at higher flow rates with Reynolds numbers more than 6000, below which the nanoparticle addition is even negative. The addition of SiO_(2) nanoparticles to the PAM solution is supposed to play a dual role. The first is an increase in flow resistance caused by the Brownian motion of nanoparticles, while the second is a decrease in flow resistance caused by acting as nodes to protect the polymer chain from shear-induced breaking under high shear action. At optimal nanoparticle concentration and under higher Reynolds numbers, the later effect is dominant, which could improve the drag reduction performance of polymer drag reducers. Our work should serve as a guide for the application of natural gas fracturing, where the flow rate is frequently very high.

关 键 词：Drag reduction SiO_(2)nanoparticle Cationic polymer Brownian motion 

分 类 号：TE377[石油与天然气工程—油气田开发工程]