Effect of electroosmotic flow on brine imbibition in porous media  

作　　者：Rui WANG Xiang-an YUE Xu WEI Wei ZHANG 

机构地区：[1]MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, P. R. China [2]Bohai Oil Material Supply Company, Tianjin 300450, P. R. China [3]China Huayou Group Corporation, Beijing 100011, P. R. China

出　　处：《Water Science and Engineering》2009年第1期103-111,共9页水科学与水工程（英文版）

基　　金：supported by the National Key Basic Research Development Program of China (Grant No. 2002CCA00700)

摘　　要：Based on Darcy＇s Law and the Helmholta-Smoluchowski equation, an imbibition velocity formula for the water phase with an electric field was deduced, showing that the imbibition velocity with an electric field is to various extents not only related to the rock permeability and characteristic length, the fluid viscosity, the oil-water interface tension and the gravity of the imbibing brine, but also to the fluid dielectric permittivity, zeta potential, applied electric field direction, and strength. Imbibition experiments with electric fields that are different in direction and strength were conducted, showing that application of a positive electric field enhances the imbibition velocity and increases the imbibition recovery ratio, while application of a negative electric field reduces the imbibition velocity and decreases the imbibition recovery ratio. The imbibition recovery ratio with a positive electric field increases with the strength of the electric field, and the imbibition recovery ratio with a negative electric field is lower than that without an electric field.Based on Darcy＇s Law and the Helmholta-Smoluchowski equation, an imbibition velocity formula for the water phase with an electric field was deduced, showing that the imbibition velocity with an electric field is to various extents not only related to the rock permeability and characteristic length, the fluid viscosity, the oil-water interface tension and the gravity of the imbibing brine, but also to the fluid dielectric permittivity, zeta potential, applied electric field direction, and strength. Imbibition experiments with electric fields that are different in direction and strength were conducted, showing that application of a positive electric field enhances the imbibition velocity and increases the imbibition recovery ratio, while application of a negative electric field reduces the imbibition velocity and decreases the imbibition recovery ratio. The imbibition recovery ratio with a positive electric field increases with the strength of the electric field, and the imbibition recovery ratio with a negative electric field is lower than that without an electric field.

关 键 词：IMBIBITION imbibition velocity electroosmotic flow electric field direction electric field strength 

分 类 号：O571.43[理学—粒子物理与原子核物理] TK124[理学—物理]