Abstract: Based on 3D physical model which can simulate growth of dominant flowing path and nuclear magnetic resonance(NMR),macro remaining oil distribution and production contribution from micro pore under different plugging methods are studied.Furthermore,controlling mechanisms of remaining oil production in dominant flowing path are summarized.Finally,strategy of remaining oil production and its adaptability are obtained through numerical simulation.The results show that,by establishing the correlation between NMR imaging and oil saturation,oil distribution in 3D model can be monitored without probes.Considering the plugging efficiency,short and deep profile controls can be applied to weak and strong dominant flowing paths respectively,and initial potential has the most important influence on the plugging.Remaining oil production in large pore contributes to most part of the overall plugging.It is also the main factor causing different recovery improvement among different plugging methods.Because channeling and initial potential in different kinds of pores are more uniform in weak path model,production of medium and small pores is slightly more efficient than in a strong model.Plugging agent content for weak path should not be too high in order to guarantee injection,and to achieve plugging objective,strong path needs relatively high injection pore volume.This study can provide some theoretical guidance for plugging design and optimization of high water cut oilfiled.

Key words: nuclear magnetic resonance, physical simulation, numerical simulation, dominant flowing path, remaining oil, reservoir