关键词: 三元复合驱, 吸附滞留, 室内实验, 数值模拟, 大庆油田

Abstract: To solve the problem that it is difficult to determine the process parameters during the field implementation of ASP flooding in Daqing Oilfield, based on the reservoir physical parameters in the east of Block Bei 2, the mass concentration of each component, shear viscosity reduction and interfacial tension change in the process of ASP flooding was studied through the laboratory displacement experiment with sand filling model, and the adsorption and retention law of each component under the dynamic condition of ASP flooding was studied by numerical modeling. The experimental results showed that the mass concentrations of each component of ASP flooding decreased with the increase of migration distance, and increased with the increase of injected amount; the loss of solution viscosity was about 60% at 20% migration distance; the oil-water interfacial tension was higher than 10^-2 mN/m at the displacement front. As indicated by the results of numerical modeling, the adsorption and retention of the mass concentration of each component of the ASP flooding solution were mainly concentrated in the near-well zone, and the losses of surfactant, alkali and polymer were 80%, 25% and 18% respectively at 20% migration distance; the lower the reservoir permeability, the more serious the adsorption and retention loss. This study provides data basis and theoretical guidance for the adjustment of ASP flooding technology in the development of in Block Bei 2, Daqing Oilfield.

Key words: ASP composite flooding, adsorption hysteresis, laboratory experiment, numerical modeling, Daqing Oilfield