摘要
介绍了一类重要的Ｎｐ＝ｆ（ｆｗ）型水驱特征曲线，即ＬＰ＝ａ－ｂｌｎ（１－ｂ－１Ｎｐ），Ｎｐ＝ａ－ｂｅ－ｋＬＰ和Ｎｐ＝ｋ（１－ａｅ－ｂＬＰ）水驱曲线。推导了这类水驱曲线的Ｓｗ～ｆｗ关系，从而加深了对这类水驱曲线油水渗流特征的认识。由于推导是可逆的，从这个意义上说，我们也完成了这类水驱曲线的推导。这类水驱曲线的驱替特征表现为累积产油量与含水率成直线关系，并且对应于Ａｒｐｓ指数递减曲线。俄罗斯将这类水驱曲线作为评价提高采收率措施效果的重要方法。３个油田的累积产油量与含水率关系、可采储量含水上升率与可采储量采出程度关系表明有一些油田的含水动态确实符合这类水驱曲线。因而这类水驱曲线有较大的使用价值。
A kind of Np=f(fw) Waterdrive characteristic curves is introduced , that is,Lp=a-bln(1-1bNp), Np=a-be-kLp and Np=K(1-ae-bLp). Waterdrive Sw-fw relation curve is derived, it deepens oilwater percolating characteristic understanding for water-drive curve . The displacement characteristic of the water-drive curve shows the cumulative oil production-water cut linear relation and corresponds Arps exponential decline curve. Russia regards this waterdrive curve as an important method for evaluating EOR effect. The cumulative oil production￣water cut and water cut raising rate of recoverable reserves ￣ producing degree relations in three oilfield show that the water cut performance in some oilfields actually accord with this waterdrive curve, so this kind of waterdrive curves has great use value.
关键词
水驱
特征曲线
油水渗流
油气藏
watercut raising rate, recoverable reserves, producing degreeFree words: waterdrive characteristic curve, exponential decline
