ЧИСЛЕННОЕ МОДЕЛИРОВАНИЕ ТЕПЛОВЫХ ЭФФЕКТОВ ПРИ ОБРАБОТКЕ СКВАЖИН РАСТВОРАМИ БИНАРНЫХ СМЕСЕЙ

The article discusses the effectiveness of the method to increase the productivity of wells when they are treated with aqueous solutions of binary mixtures. After injection of the solution into the formation, an exothermic reaction of interaction between the components of the binary mixture accompanied by the evolution of gases is initiated. The impact on the bottomhole zone of oil wells of heated chemical reaction products is combined and reduces to three phenomena: the warming of the rock and the oil in it; cleaning of the bottomhole zone from paraffins, resins and colmatizing sediments; expansion of natural cracks and the appearance of artificial cracks. As a result of the treatment near the well, two regions are formed: with increased conductivity and high temperature (where the viscosity of the oil decreases). The sizes of the areas may not coincide. Each region contributes to an increase in the productivity of the well. In the work by methods of mathematical and numerical modeling, the processes of thermal effect of chemical reaction products to the formation are investigated and the increase in the flow rate of the well is estimated due to the decrease in the viscosity of oil. A mathematical model of the reacting process for a binary mixture in a porous media, its filtrations and influence on a reservoir system is proposed. The numerical solution of the problem was carried out on the basis of the OpenFOAM open integrated platform. The results of numerical modeling of the reaction process of a binary mixture and the subsequent extraction of oil from a heated reservoir are presented. Estimates of the temperature increase and the size of the heating region during the exothermic chemical reaction in the pore space, as well as the expected increase in oil production and the duration of the effect were obtained. The cases of different concentration of active substances are investigated. The high economic efficiency of the method for increment well production is shown