The features of the operational assessment of well drainage zones in a real field environment are considered. The proposed method is based on finding a flow-separating boundary between producing wells when liquid is filtered to them from injection wells. The main assumption accepted is the distribution of the lengths of the current lines from the main to the neutral according to the exponential law. The geometry of the current lines varies depending on the flow rates and pickups of wells. An equation is obtained that determines the ratio between the debits of neighboring producing wells, depending on the permeability and thickness of the formation in the drainage zones of wells, depressions, and the geometry of filtration flows. The number of current filtration tubes in the drainage zones of each of the producing wells surrounding the injection well, the position of the flow dividing boundary and the area of the well drainage zones are determined. Depressions in wells are determined by known wells rates using the superposition method. The validity of the proposed approach is justified by comparing the results of well drainage zones calculation with accurate analytical solutions valid for symmetrical flooding schemes and homogeneous formation. For the 9-point flooding scheme, the discrepancy in the calculations of depressions did not exceed 2%, the displacement of the flow dividing boundary at the injection well was 2°. The calculations have shown that the angles of the areal inflow to the wells do not correspond to their drainage areas.
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