关键词: 聚合物驱油藏, 剩余油饱和度, 渗透率, 聚合物, 孔隙体积倍数, φ函数法, 数值模拟

Abstract: The φ-function method which is used in estimating residual oil saturation distribution in water-drive reservoir was applied to polymer-drive reservoir in consideration of the characteristics of polymer-displacing process, such as polymer adsorption and the permeability descending. The relationship between viscosity and concentration of polymer solution was analyzed. The relationship between the saturation of residual oil and the pore volume factor of accumulative injection fluid was achieved by modifying the relative permeability curve. Solving pressure and saturation can avoid the instability and complex calculation of multi-element equations. The application of this method in pilot test showed that the predicted results were relatively accurate. This method is feasible for predicting the distribution of residual oil.

Key words: polymer-drive reservoir, residual oil saturation, permeability, polymer, accumulative injection pore volume, φ-function method, numerical simulation