关键词: 非均质油藏, 化学驱, 驱替效率, 波及效率, 提高采收率

Abstract: Oil displacement processes of water flooding,polymer flooding and alkali-surfactant-polymer(ASP) flooding were simulated respectively by the use of heterogeneous normal rhythm 2D section geologic model and chemical simulator ASP 2.0 developed by our country.The effects of oil displacement efficiency and sweep efficiency of every layer were investigated.Many index parameters were compared.The study results show that the displacement efficiency and sweep efficiency play different roles in the different layers.The displacement efficiency primarily contributes to the most permeable zones,and the sweep efficiency primarily contributes to the lowest permeable zones. Both displacement efficiency and sweep efficiency contribute to the medium zones.After water flooding,the residual oil saturation in very low-permeability zone is still high.The improvement of the recovery in the low-permeability zone is significant for enhancing the ultimate recovery of the reservoir.For highly heterogeneous reservoirs,chemical flooding after profile control is an important way for improving oil displacement effectiveness.

Key words: heterogeneous reservoirs, chemical flooding, displacement efficiency, conformance efficiency, enhanced oil recovery