Tyumen suite is a low permeable reservoir with difficult geological aspects. Sensitivity of production well to work start reservoir pressure maintenance system in low permeable reservoir conditions is less than traditional reservoirs thus flow back oil production of injection wells is compare with efficiency of reservoir pressure maintenance system. In this connection injection wells flow back period issue is actual for technical and economics indexes enhance. The conversion to injection decisions are based on production rate decline analysis and results of hydrodynamic modeling. For this purpose was created hydrodynamic three phase model which segment was used for multiple option calculations. The goal of multiple option calculation is injection wells flow back optimum period definition. The efficiency of reservoir pressure maintenance system was estimated for each injection well with different flow back period. Each injection well has its own flow back optimum period. With conventional approach, that means many variations and computation which number depends on the number of injection wells and flow back period detail. This way is complicated for continuously updated geological information from drilling operations. An express method for injection wells flow back optimum period definition with minimal number of hydrodynamic calculations was proposed. Definition of reaction intensity between injection well and environment wells based method. The express method give closed to optimum result with significant reduction in labor costs.
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