Study On Alkaline Transmission Mechanism In Porous Media

In this paper we have systematically studied the theories of the main physical chemistry phenomena of alkaline flooding or ASP flooding, such as adsorption, retention, diffusion effect in formation porous medium, set a mathematical model for describing these phenomena, carried on relevant experiment research. Transmission equation of alkaline solution in porous media is established, and chemical agent adsorption on mineral and the diffusion coefficient are surveyed.We have studied the reaction of clay mineral such as kaolinite, montmorillonite or frame mineral such as quartz, feldspar and alkaline solution. In the Transmission course, alkaline loss can be devided into two parts, quick reaction stage and chronic reaction stage, contain adsorption,ion exchange and slow dissolution.Use the multi order reaction method instead of the normal first order reaction method to illustrate the dissolution reaction of alkaline and mineral. Confirm dissolution speed constant and multi order reaction co-efficiency.Build the alkaline solution transmission equation in the porous media of stratum mineral, apply dissolution speed constant and multi order reaction co-efficiency to the one-dimensional fluid equation and two-dimensional fluid equation. and calculate alkaline solution concentration distribution. Compared the numerical solution and experimental result, it's basically compatible. Further analyze the transmission regularity in the porous medium, and offer the theoretical foundation and technical parameter for the software of numerical simulation completion.Alkali solution transmission model can be used for predicting alkaline loss,optimizing the parameters of alkali original concentration and alkali slug size, receive effective displacement efficiency and better oil recovery by alkaline or ASP flooding.