MODELING OF LOW SALINITY WATERFLOODING IN CLAY-CONTAINING OIL RESERVOIRS

Abstract

Analysis of osmotic and ion exchange processes between injected agent and clay-containing rock has been carried out. The analysis allowed to obtain reservoir properties depending on ionic composition and salinity of the injected water and ratio of clay-content of reservoir. It’s been shown that change of hydrochemicalmode of formation development leads to transformation of structure of porous medium, and as a result to changes in reservoir porosity and permeability properties. Analytical dependencies of porosity and relative phase permeability on the salt concentration and ion composition of injected fluid have been obtained on the basis of micromechanical description of fluid flow process in porous medium. The modeling of two-phase Newtonian fluids flow in clay-containing porous medium has been carried out. Influence of parameters of porous medium and injected saline liquid on oil production has been researched. Efficiency of low salinity solutions and highactive metals solutions injection in clay containing reservoir has been shown.