Abstract: Waterflood development is one of crucial measures for high and stable productions. With definite water injection timing and pattern, water injection intensity and, especially, the injection allocation rate is very important. The proper injection allocation rate of well can effectively relieve the contradictions of plane, interlayer and inherent layers, and improve the effects of oilfield exploitation by waterflood or water drive process. After synthetically analyses and researches of the existing methods for injection allocation rate, this article takes the group of water-injecting wells in waterflood oilfield as the research unit, the multiple regression method to decide the injection allocation rate is applied, by which and its regression coefficient and partial correlation coefficient, the multivariate regression models of Model I and Model II are developed. The case study indicates that this method is characterized by simpleness and practicability for application.

Key words: regression analysis, well group, injection allocation rate