The paper demonstrates the application of 3D geomechanical modeling results for: identifying zones of increased and lowered risks for entire area of the field, optimizing trajectories of production wells, and forecasting sand production in various productive horizons. Synthetic cubes of the «safe drilling window» have been modeled for the typical design of the production wells in order to determine the intervals of increased risks from breakouts and mud losses point of view. Finite element method was used for 3D geomechanical modeling of the entire area of the field with usage of Local Grid Refinement (LGR) within the areas of active production drilling. The results of numerical modeling and elastic-strength properties of rocks was used for creation maps of drillability (gradient of pore pressure, gradient of breakouts, gradient of mud losses and fracture gradient) for various horizons over the entire area of the field to determine the safest zones in terms of drilling and zones where optimization of trajectories or well designs is necessary. Creation of the maximum possible depression maps before sand production occurs along the area of the field was made. Based on the drilling maps analyses, an example of the field demonstrates distribution of increased risks areas from drilling point of view and changes in the required mud weight or well design. Within the framework of the article will be shown the influence of existing tectonic faults on changes in the "safe mud weight window" and pressure before sand production will be determined. Based on the numerical modeling results, optimization of the field development system was proposed to reduce drilling related risks, optimize hydraulic fracturing design and reduce the probability of sand production. The necessity of using geomechanical modeling results on every «life-cycle» of the field and actualization of the created geomechanical models is shown. The example of the field in Eastern Siberia shows the possibilities of using 3D geomechanical modeling results to optimize drilling techniques, to reduce the probability of drilling related problems and problems related to sand production and completion system. The influence of geomechanical factors on different processes during field development is shown, which ultimately can lead to the optimization of field development plan by collaboration work with geologists, drilling and development engineers.

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