活性纳米颗粒与岩石表面间微观力学作用实验解析与润湿调控预测  

Direct experimental analysis of microscopic forces between active nanoparticles and rock surface and wetting regulation forecasting

作　　者：袁彬[1,2] 韩明亮[1] 张伟 李东明[1] YUAN Bin;HAN Mingliang;ZHANG Wei;LI Dongming(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;State Key Laboratory of Deep Oil&Gas,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]深层油气全国重点实验室(中国石油大学(华东)),山东青岛266580

出　　处：《中国石油大学学报(自然科学版)》2025年第1期120-127,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家重点研发计划项目(2022YFE0129900);国家自然科学基金项目(52074338)。

摘　　要：微观作用力决定了纳米颗粒在岩石壁面的吸附行为,进而影响纳米颗粒调控壁面润湿性的能力。基于原子力显微镜测量活性SiO_(2)颗粒与石英基底间作用力,建立力学作用理论模型并分析其主控因素;进行纳米颗粒在壁面吸附的分子动力学模拟,验证力学模型的合理性;基于力学机制建立预测纳米颗粒调控壁面润湿性的数学模型。结果表明:溶液离子浓度越大或离子价态越高,活性SiO_(2)颗粒与石英基底间作用力越倾向于表现为引力,所建立的力学模型可高效拟合二者间力学数据;二者间力学作用可由离子浓度、纳米颗粒表面修饰分子的长度等因素调控,但离子浓度为主控因素;在双对数曲线中纳米颗粒在壁面的黏附功和壁面油相接触角的变化值呈线性关系。The microscopic forces determine the adsorption behavior of nanoparticles on rock surface,which in turn affects the capacity of nanoparticles to regulate rock wettability.In this study,atomic force microscopy was used to measure the forces between active SiO_(2) particles and quartz substrate,and a theoretical model was established with the main controlling factors were analyzed.Molecular dynamics simulations were conducted to simulate the nanoparticle adsorption on rock surface and verify the rationality of the force model.A mathematical relationship was then figured out based on the force model to predict the rock wettability regulated by nanoparticles.The results show that large solution salinity and high ion valence make the force between the SiO_(2) particles and the quartz substrate tend to be attractive,which can be efficiently fitted by the established force model.The force between nanoparticles and rock surface can be regulated by the salinity and the length of alkanes modified on nanoparticle surface,but the salinity is the dominant factor.It appears a linear relationship between the adhesion work of nanoparticles on rock surface and the change value of oil contact angle in a double logarithmic coordinate.

关 键 词：提高采收率 活性纳米颗粒 原子力显微镜 润湿调控 纳米力学 

分 类 号：TE348[石油与天然气工程—油气田开发工程]