Key words: field-geologic analysis, sidetracking, flow simulation, sector model, multiple calculations.
The aim of this work is to validate the sidetracking effectiveness on the ground of field-geologic analysis, using the flow simulation of the oil-field. The first stage of work involves selection and field-geologic analysis of the investigated area. The second stage is to create a sector of geological-and-hydrodynamic model, to select and substantiate of parameters uncertainty using the field-geologic analysis. After selecting the options, series of calculations of the sector model have been performed, and results have been considered. The best option, that is closest to the historical production data, has been selected. In the last stage is to calculate the suggested options for development of the field facility, according to the project document on upd ated geological-and-hydrodynamic model. In conclusion, recommendations are given for the adjustment of the new sidetracking.