Abstract: Based on the study of existing water drive characteristic curves, 4 types of water drive characteristic curves are screened out, which accord with three main characteristics. The first can be used to describe different forms of water cut curves and recovery percent with wide adaptability and without viscosity and reservoir type limitation; the second is to resolve the fault of existing general (ideal) water-drive characteristic curves which can not describe the correlation between water cut and recovery percent in the period of water free production; the third is relative simple for solution. The case study shows that it is of good effect and worthy of reference and popularization for other oilfields.

Key words: water drive, recoverable reserve, recovery percent, water cut, method