Abstract: In order to clarify the major affecting factors of oil recovery rate in different exploitation phases, this article analyzes uses the partial correlation analysis method to analyze the influences of permeability, viscosity, reserves abundance, well spacing density and injector-producer ratio on the oil recovery rate by using performance data from domestic 26 reservoirs. The result indicates that the permeability, viscosity and reserves abundance mainly affect the early oil recovery rate, seldom influence the late one; the well spacing density and injector-producer ratio mainly affect the late oil recovery rate compared with the early one.

Key words: oil recovery rate, partial correlation analysis, influencing factor