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Study on Remaining Oil at High Water Cut Stage of the Offshore Strong Bottom Water Reservoir

Journal of Geoscience and Environment Protection 2023年第6期11卷 76-82页

作者： Jie Tan Zhang Zhang Tingli Li Jingmin Guo Mo Zhang Tianjin Branch of CNOOC Ltd. Tianjin China

C oilfield is a heavy oil field developed by horizontal wells and single sand body in Bohai oilfield. The edge and bottom water of the reservoir is active and the natural energy development mode is adopted. The comprehensive water cut of the oilfield was 95.3%, which had entered the stage of high water cut oil production. Some reservoirs were limited by crude oil viscosity and oil column height. Under the condition of existing development well pattern, some reserves were not produced or the degree of production was low, and the degree of well control was not high, so there is room for tapping the potential of remaining oil. This paper studied the rising law of water ridge of horizontal wells in bottom water reservoir by reservoir engineering method, and guided the infilling limit of horizontal wells in bottom water reservoir. At the same time, combined with the research results of fine reservoir description, the geological model was established, the numerical simulation was carried out, and the distribution law of remaining oil was analyzed. Through this study, we could understand the law of water flooding and remaining oil in the high water cut period of bottom water heavy oil reservoir, so as to provide guidance for the development strategy of this type of reservoir in the high water cut period.

关键词： Bohai Oilfield Heavy Oil Reservoir flooding law Remaining Oil

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