Abstract: Waterdrive characteristic curve is an important method for forecasting production rate and commercial reserves of waterflood field. There are many types of waterdrive characteristic curves presented by scholars at home and abroad. As the complexity of oilfield development, it is difficult to describe them quantitatively. Each type-curve is only suitable for particular water cut stage rather than the whole process of oilfield development. The curves widely applied in China are four types of A, B, C and D, based on which AB and CD type-curves are proposed in this paper. The case study demonstrates that these type-curves are good accordance with real data and possess simplicity, practicability and reliability.

Key words: oilfield development, waterdrive characteristic curve, type curve, recoverable oil, reserve, recovery percent