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The phenomenon of high injection production ratio and low formation pressure maintenance level are common in peripheral oil fields of Daqing oilfield. It is considered that the outflow of water injection exists in the reservoir. In this paper, the optimal mathematical model is established with the maximum oil production as the objective function and the injection pressure and flowing pressure as the constraints. Based on the material balance equation considering the overflow water, the calculation formula of formation pressure changing with time, and other parameters changing such as injection production ratio are derived. The reasonable interval injection production ratio in a block can be obtained by the iterative method, which provides a theoretical basis for reasonable production and injection allocation in the middle-later stage of water drive reservoir development.

A new method for reasonable injection production ratio calculation of considering external flow volume