Aim to the difficulties during the evaluation of favourable channels and displacing heterogeneity, namely water fractional flow, development coefficient and flux intensity were obtained to characterize the flow field of offshore oil reservoir, by the law of the water fractional flow relationship curve, in combination with new parameters based on the evaluation of offshore oil oilfields in the high water-cut stage. The flow field was classified with feature classification point method. Three feature classification points were determined by the characteristics of the linear section of the relationship curve of flux intensity and water flow rate and the inflection points on the linear section of the semi-logarithmic curve of the oil-water permeability ratio, and a "three-point and four-level" index flow field characterization method was established. The study results were applied to the flow field evaluation of offshore oil reservoirs, and the results showed that when the water fractional flow of the three classification points was 22%, 73% and 90%, respectively, the potential, development status and dominance of the flow field can be clearly defined. This flow field evaluation method is of certain theoretical guiding significance for the flow field reconstruction and development effect improvement in the later stage of offshore oilfields.
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