An algorithm has been developed for calculating ineffective filtration of injected water through highly permeable interlayers identified by the indicator method in a reservoir hydrodynamic model. Adaptation is carried out in three stages. At the first stage, a site is selected on which tracer research were carried out for 120 days. At least 40 successful samples must be obtained in each production well of the site. At the second stage, the permeability of the main layer of the current hydrodynamic model is detailed. Each production well has its own permeability value. The adequacy of the created model at this stage is determined by the coincidence of the calculated and actual values of the injectivity of the injection well and water flow rates of production wells. At the third stage, a thin layer is identified in the model, in which highly permeable channels are built between each pair of injection and production wells. The permeability and volume of such paths are selected based on the distribution of the indicator mass between production wells in the field. The correctness of the proposed algorithm was tested on a real oil field. Models of two neighboring plots were adapted separately and then together as a single plot. The discrepancy between the actual and calculated flow rates of production wells, the distribution of the tracer and the injectivity of injection wells did not exceed 10 %. This shows the possibility of adapting the hydrodynamic model of the field as a whole by successively adapting individual sections with sequential attachment to each other. The refined model makes it possible to evaluate the impact of low flow resistance channels on waterflooding efficiency, predict the success of measures to equalize the injectivity profile, and also provides a more accurate long-term forecast of oil deposits exploitation efficiency.
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