Abstract: The oil well control reserves determination often is obtained through the well test analysis or the numerical simulation analysis, but the well test analysis and the numerical simulation analysis have their disadvantages, it is difficult to analyze the single well control reserves on time, basically, the relative permeability and the recovery index change of single well have not been used to determine single well control reserves. This article, in the analyzing recovery index change and the relative permeability relation, proposes a new method to determine the single well control reserves, the relationship of the decline rate between the recovery index and the relative permeability is obtained, single well control reserves is calculated, this method is suitable specially for the oil field development mid late period, and the accurate forecast to the surplus recoverable reserves, taps latent potentialities the measure for the single well to provide the reliable basis.

Key words: relative permeability, recovery index, single well control reserves, declining rate, productivity