本文利用作者发展的三相剖面模型,研究了正韵律厚油层在注水后期注气提高扫油厚度系数的驱油机理,分析了各种力在油、气、水运动中的作用。通过数值模拟计算,定量地研究了在注水后期注气对改善这类油层开发效果的可行性,从而,对这一提高采收率措施作出了适当的评价。 In this paper, using the three-phase cross-section model developed by the author, the displacement mechanism of thick positive swept oil thickening coefficient by gas injection in the later stage of water flooding was studied, and the role of various forces in oil, gas and water movement was analyzed. Through numerical simulation, the feasibility of inject gas injection in late stage of waterflooding to improve the development effect of these oil reservoirs has been quantitatively studied. Therefore, this measure for improving oil recovery has been properly evaluated.