This article proposes a method for selecting of optimal oil field development system using a two-dimensional semi-analytical simulator, based on solving of Laplace equation for calculating pressure fields and using the Buckley – Leverett theory with the method of current lines for calculating saturation fields, taking into account the geological heterogeneity of the reservoir. The account of geological heterogeneity in the two-dimensional simulator is made by means of dependence of the grid coverage coefficient on length of the current line. The distribution of current line lengths in the three-dimensional hydrodynamic model characterizes the geometry of sand bodies and geological heterogeneity of the reservoir, and the value of the grid coverage coefficient numerically expresses this heterogeneity. This approach makes it possible to speed up the process of selecting the optimal parameters of development (density of the well grid, types of well completion, parameters of the hydraulic fracturing design on producing wells, half-length of fractures after auto-fracturing on injection wells, value of bottom-hole pressure on producing and injection wells, deformation coefficient for the grid of wells, etc.) at the decision-making stage. The parameter for choosing of the optimal development system, i.e. its optimal parameters, is the maximum value of the net present value when the conditions for achieving of the design oil recovery ratio are met. The calculation of economic parameters is carried out according to the dependencies inherent in the two-dimensional semi-analytical simulator, which allows the entire cycle of technical and economic analysis in one tool. In particular, this technique is extremely relevant for fields with low permeability and disjointed reservoir. Since the key feature of this approach is the account of geological heterogeneity.
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