Abstract:

There is a lack of uniformity and standardization of the existing optimal injection allocation method. Therefore, three key parameters involved in the optimization of water injection well allocation, which are longitudinal splitting coefficient, plane splitting coefficient and injection-production ratio, are taking as the breakthrough point. And then, the research on the allocation optimization of injection wells by the scholars at home and abroad is summarized. Finally, the calculation method of injection well allocation suitable for different occasions is obtained. On this basis, a new idea of optimizing injection allocation for water injection wells is proposed with the oil production wells as the center. This new idea emphasizes that for the optimal injection allocation of the water injection wells, the optimal injection parameter calculation method should be selected according to different geological reservoir characteristics, oilfield development stages, injection accuracy and other factors, so that to make the oilfield optimized water injection effect best. After this method is applied to the field test, a good development effect is achieved with a daily oil increase of up to 10 %（daily oil increase of 20 m³） in the block. In general, the optimization of water injection direction in the future must be the integration of reservoir and oil production engineering with the water injection scheme design, intelligent optimization and synchronous adjustment are the core based on artificial intelligence. The proposed optimized injection well allocation method has guiding significance for the water injection work of different types of oilfields at different stages of development.

Key words: injection allocation method, interval, longitudinal splitting coefficient, plane splitting coefficient, injection-production ratio