关键词: 润湿性 , 采收率 , 渗流阻力 , 波及效率

Abstract: For achieving a better understanding of the effects of wettability on the oil recovery,the core displacement experiments were carried out.By using outcrop man-made cores with low,middle and high permeability,and convertingcores wettability from water-wet and oil-wet to intermediate wet,the oil recovery efficiency after water flooding on the cores was studied.The results show that converting cores wettability from water-wet and oil-wet to intermediate wet is favorable to decreasing maximumly the capillary force as a resistance force in reservoir pores,and enhancing water displacement effects.So the suggestion that the wettability of water-wet and oil-wet should be changed into intermediate wet on the experimental condition.

Key words: Wettability , Oil recovery efficiency , Seepage resistance , Sweep efficiency