MATHEMATICAL MODELING OF THE PROCESS OF INJECTING THERMOGEL-FORMING COMPOSITIONS INTO A STRATIFIED NONUNIFORM FORMATION

The article is devoted to modeling the process of injecting thermogel-forming compositions into a vertical injection well that uncovers a stratified-nonuniform formation with an inhomogeneous temperature field. By integrating thermal and hydrodynamic problems, analytical solutions are obtained that allow modeling the forming of a gel barrier in the course of time. Using the mass conservation law, expressions are determined for the water flow rate into each seam after treatment, and formulas are obtained for calculating changes in bottomhole pressure and water content in the process of gel barrier formation. It is shown that the steady-state distribution of the formed gel concentration is determined by two opposite effects. On the one hand, the formation temperature increases with distance from the injection well, while, on the other hand, the concentration of the thermogel-forming composition decreases, so that a maximum is observed in the distribution of the concentration of the gel formed. Calculations of the dynamics of water content show that the formation of a gel barrier in a highly permeable layer is accompanied by a redistribution of water flows and a maximum decrease in water content in the product. The formation of a gel barrier in a low-permeability layer is accompanied by a slight increase in water content, but largely determines the final effect of using thermogel- forming compositions.

Author:  I. V. Vydysh, K. M. Fedorov, T. A. Kremleva
Keywords:  technology of leveling the intake profile, thermogel-forming compositions, gel formation on a change in temperature, stratified -onuniform formation, low-permeability gel barrier, redistribution of flows, reduction in water content
Page:  957