The application of computer numerical simulation on study of polymer-surfactant flooding

This article demonstrates the method of computer numerical simulation of polymer-surfactant flooding. According to the feature of polymer-surfactant flooding, account is taken of the adsorption and dispersion of polymer component and surfactant component in stratum and mathematical model of each component has been established. The difference method has been adopted to solve mathematical model and the numerical simulation software has been designed. Taking the block of Xing II in DaQing oilfield for example, the development indices of polymer-surfactant flooding has been predicted. Meanwhile, the feasibility of polymer-surfactant flooding has been evaluated through contrasting to water flooding, polymer flooding. According to the results of numerical simulation, the ultimate recovery of polymer-surfactant flooding of this block is 56.14%. It enhances recovery 11.03% contrasting to waterflooding and enhances recovery 3.22% contrasting to polymer flooding. This study has significant theoretical value to the evaluation of development effects and the prediction of development indices.