At present time the integrated modeling is a new and dynamically developing area of the present-day petroleum engineering. At the classical approach to filed development, the reservoir, well and surface facilities models, as a rule, are created and optimized separately from each other. However, attempt of optimizing the field development system as a whole should consider for the interaction of all elements of the field development system, since optimization of one element can lead to changes in input condition and deoptimization of the others. Such approach means that the field development optimization should combine reservoir, well and surface facilities modeling to allow the field development managing based on maximizing technical and economic performance.

Creation of the integrated model for such huge fields as Priobskoe demands enormous computing expenses and does not allow fast enough necessary calculations for operative optimization of development system by means of the integrated reservoir-well-facilities model.

This article provides a discussion on the rescaling issues of the existing detailed field model. A typical rescaling procedure, consisting in proportional integration of the cells sizes of reservoir hydrodynamic model up to tens meters and more, appeared an insufficient for satisfying the objectives. There was a necessity of creation of an integrated model with the optimum size of an element comparable with the size of one pad.

This article demonstrates the technique of the hydrodynamic model construction, consisting of several hundreds not of orthogonal cells, the issues of properties averaging and production activity in a cell-pad, and reviews the results of comparison initial and approached ("proxy") field models. The final model integrated well and surface facilities models. It allowed to reduce essentially an estimated time of the integrated model, and thus to predict operatively with the required accuracy the basic technological indicators of the Priobskoe field development and to optimize the field development and surface facilities design.

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