Surface-functionalized cellulose nanocrystals(CNC)and synergisms with surfactant for enhanced oil recovery in low-permeability reservoirs

作     者：Zhe Li Wan-Li Kang Meng-Lan Li Hong-Bin Yang Tong-Yu Zhu Ying-Qi He Hai-Zhuang jang Bo-Bo Zhou Ji-Ting Hao 

作者机构：Key Laboratory of Unconventional Oil&Gas DevelopmentChina University of Petroleum(East China)Ministry of EducationQingdao266580ShandongPR China School of Petroleum EngineeringChina University of Petroleum(East China)Qingdao266580ShandongPR China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2023年第20卷第3期

页      面：1572-1583页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：the China National Postdoctoral Program for Innovative Talents(Bx20200386) China Postdoctoral Science Foundation(2021M703586) Key Program of National Natural Science Foundation of China(52130401) National Natural Science Foundation of China(52204064,52104055)for financial support 

主　　题：Low-permeability reservoirs Enhanced oil recovery Cellulose nanocrystals(CNC) Surfactant Dispersion stability 

摘      要：Nanocellulose,a natural polymeric nanomaterial,has attracted significant attention in enhanced oil recovery(EOR)applications due to its abundance,nanoscale,high oil-water interfacial adsorption *** this study,surface-functionalized cellulose nanocrystals(SF-CNCs)were prepared via hy-drochloric acid hydrolysis and chemical modification,with adaptable nanosize and considerable dispersion stability in low-permeability *** SF-CNCs were structurally characterized by FT-IR,Cryo-TEM,which have a diameter of 5-10 nm and a length of 100-200 *** SF-CNC dispersions possessed higher stability and stronger salt-tolerance than those of corresponding CNC dispersions,due to the strong hydrophilicity of the sulfonic acid *** was synergistically used with a non-ionic surfactant(APG1214)to formulate a combined flooding system(0.1 wt%SF-CNC+0.2 wt%APG1214).The combined flooding system exhibits strong emulsification stability,low oil-water interfacial tension of o.03 mN/m,and the ability to alter the wettability for oil-wetting ***,the combined system was_able to provide an optimum EOR efficiency of 20.2%in low-permeability cores with 30.13×10^(-3)μm^(2).*** can enlarge the sweep volume and increase the displacement efficiency ***,the newly formulated nanocellulose/surfactant combined system exhibits a remarkable EoR performance in low-permeability reservoirs.