Based on Darcy's law and relation between water cut and pore volume, a practical equation for describing water flooding regulation was established.

A new method to reasonably select a line segment on a water drive curve

In the middle-late stage of reservoir development,the water drive curves show "downward" or "upward" phenomena after the production structure adjustment of oilfields or development units.

Combined generalized Копытов model with water drive curve of B type,this paper presents a kind of practical method which can predict oilfield development indexes by water drive process,such as water cut,oil production rate,water production rate,liquid production rate at different time when oilfield development comes into declining.