纳米硅胶体系驱油理论与数学建模

为了定量研究纳米级二氧化硅粉体成胶体系的驱油效果，对纳米硅胶驱油机理进行了理论分析。在连续性介质渗流理论、硅胶溶液流变性理论、硅胶在孔隙介质内吸附和运移理论基础上，建立了一个两相多组分硅胶驱油数学模型，并开发了一个数值模拟器，定量模拟了硅胶质量浓度、注入体积和注入方式对孔、渗参数和开发效果的影响。结果表明，纳米硅胶溶液驱油会降低储集层孔、渗参数，但是会大幅度提高采收率；段塞注入优于交替和连续驱油方式。

Theory and Mathematical Modeling of Nano-Silica Gel System for Oil Displacement

The theoretical analysis of nano-silica gel for oil displacement is conducted to quantitatively study the oil displacement effect of SiO2 gel system in nanometer scale. Based on the theories of continuous flow of porous media, rheology of silica gel solution and adsorption and migration of silica gel in porous media, a two-phase multicomponent mathematical model for oil displacement is developed with a numerical simulator, by which effects of the silica gel mass concentration, injection volume and flooding style on porosity, permeability and production response. The results show that the nano-silica gel solution can be applied to decrease values of reservoir porosity and permeability and obviously increase oil recovery, indicating that the plug injection process of silica gel solution is better than its alternative or continuous injection process for oil displacement.