均质多孔介质中纳米颗粒吸附层的水流滑移模型  

A advanced slip model of adsorption layer of nano particles in homogeneous porous media

作　　者：顾春元[1,2] 李国健[1,2] 狄勤丰[1,2] 张景楠[1,2] 秦荣胜 

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072 [2]上海大学上海市力学在能源工程中的应用重点实验室,上海200072

出　　处：《水动力学研究与进展（A辑）》2016年第6期714-720,共7页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(51274136);上海市科委重点项目(071605102);上海市重点学科建设项目(S30106);上海市教委重点项目(高峰学科建设项目)资助项目~~

摘　　要：考虑纳米颗粒吸附边界层对管径大小的影响和不同流态时的岩心渗透率的差异,建立了基于纳米颗粒吸附的均质多孔介质水流滑移数学模型(K-L MⅡ)。测试了油基和水基两种纳米流体的减阻效果,两组岩心水相渗透率的增幅平均分别为46.5%和76%。利用K-L MⅡ和K-L MⅠ计算了两组岩心中的水流滑移长度,大约在20–80 nm左右。结果显示,两者的差异较大,最大相差100%,表明不宜用K-L MⅠ计算具有吸附层厚度影响的滑移长度。利用K-L MⅡ解释了纳米颗粒吸附造成孔道减小而注水量增加的矛盾,为阐述纳米减阻机理提供了理论依据。K-L MⅡ也适用于吸附层厚度为0的水流滑移效应,具有普适性。Considering the influence on mierotube diameter from the adsorption ofnanoparticles and the differences of core permeability in different fluid state, a flow slippage mathematical model of homogeneous porous media （called K-L M II） with hydrophobic nanoparticles adsorption is established on the basis of the homogeneous equivalent multi-capillary physical model. The drag reduction effect of oil-based and water-based nano fluids were tested using core flow experiment. The average growth rate of core water phase permeability of the two groups are 46.5% and 76.3%, respectively. The slip length of water flow induced by the nano adsorption layer in the two groups of rocks is calculated by using K-L MII and K-L M I, which is about 20-80 nm. The results show that the difference between the two is very large, the most is 100%, which indicates that it is not suitable by K-L M I to calculate the slip length with the influence of adsorption layer thickness. The model K-L M II can explain the contradi- ctions between decreasing pore diameter caused by the adsorption of nanoparticles and increasing water injection. It provides a theoretical basis for the nano drag reduction mechanism and provides a new method of characterizing the slip length in porous media. K-L M II is universal and also suitable for flow slip effects caused by adsorbing various kinds of surfacants in porous media.

关 键 词：纳米颗粒吸附层 减阻机理 滑移模型 均质多孔介质 

分 类 号：TE3[石油与天然气工程—油气田开发工程]