Modeling the acid treatment of the dolomitic collector of an oil formation bottom-hole zone with account of rock colmatation

The problem of modeling the acid treatment of the dolomitic collector of an oil formation bottom-hole zone is considered with account of rock colmatation. Themodeling is performedwithin the framework of mechanics of multicomponent and multiphase flows using the mean values of the reservoir porosity and permeability with account of kinetics of the acid digestion of the dolomitic rock. A mathematical model of the process that allows for liquid seepage flow and the chemical reaction of the acid with the rock matrix proceeding in the kinetic regime is presented. On the basis of the model proposed the motion of an active admixture and the variation in the filtration parameters of the formation in the process of the reactant pumping are investigated. The rock colmatation effect on the acidizing process is estimated. Numerical calculations are performed and the process characteristics are determined.