关键词: 流管法, 启动压力梯度, 低渗透油藏, 数值模拟

Abstract: Actual reservoirs numerical simulation was conducted with streamtube method aiming at the point that threshold pressure gradient existed in lowpermeability reservoirs. One injection well and one production well conceptual model was established, the streamtube fluid layout was drawn, the method of analyzing water flooding dynamic analysis was elaborated, comparison between the water saturation field of the conceptual model was made, and its validity was proved. Numerical simulation research of normal block X6 and lowpermeability of threshold pressure gradient block C55 were made, also the validity of streamtube method applied on actual blocks were proved. The research show that numerical simulation research with streamtube method could accurately evaluate produced degree and reflect remaining oils distribution when it was applied on both normal and lowpermeability reservoirs, and it could also accurately describe the feature that lowpermeability reservoirs hardly get effective producing degree for its threshold pressure gradient. 

Key words: Streamtube method,     ,  Threshold pressure gradient,    ,  Lowpermeability reservoirs,    ,  Numerical simulation