Abstract: The chemical flooding model for reservoir of Bei'erxi pilot area in Daqing Saertu oilfield is developed, by which the influences of chemical concentration, slug size and injection rate to oil displacement efficiency with alkali-surfactant-polymer folding system containing main slug, auxiliary slug, pre-slug and over-slug are simulated, respectively. The results show that in the main slug the alkaline and surfactant concentrations have obvious effects on the oil recovery. And each of them has an optimal value relating to maximum recovery. Increasing polymer concentration of either alkali-surfactant-polymer main slug or auxiliary slug will significantly improve the incremental oil recovery. Change of sizes of these four slugs will result in change of EOR to a certain extent.

Key words: alkali-surfactant-polymer flooding, numerical simulation, EOR, Daqing oilfield