Numerical Simulation Study Of Profile Control By Clay Particles After Polymer Flooding

In order to describe migration law and transfusion characteristics of clay particles and floc units in the process of residual polymer reutilization, this thesis, based on chemistry flooding model, considers the reaction of clay particles and polymer, apparent viscosity of mixture, these equations of adsorption, inaccessible pore volume, residual resistance factor the detention of solid constituent and the influence to porosity and permeability as well as presenting a three-dimensional, three-phase, six-component mathematical model that can be used for simulating profile control of residual polymer reutilization. The author applies mathematical discrete into each components equation in this model, and finally turns into the system of linear equations to solute. Runge-Kutta method is used for the solution of polymer flow equation, whereas operator splitting algorithms are used to split the equation of clay particles and floc units into a hyperbolic equation for convection and a parabolic equation for diffusion, which effectively ensure the precision, high speed and stability, these method improves the precision and speed of calculation. In this thesis, a number of conceptual models are established, and the sensitive analysis is carried on for the formation parameters and the injection parameters which will have an influence on the effect of profile control of residual polymer reutilization. The results indicate that with the permeability ratio increases, the enhanced recovery rate of residual polymer reutilization presents a first increases and then decreases trend; with an earlier injecting clay particles, a bigger injecting clay particles quantity, a bigger injecting clay particles density and a smaller injecting clay particles rate, the enhanced recovery rate effect will be better. The numerical simulation had been applied successfully in the 4-P1920 experimental area of Lamadian Oilfield to forecast the effect after clay particles suspension injection and optimize the injection parameters.