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The article describes the results of implementation tracer studies at one of the complex fractured-cavernous carbonate reservoir in the Republic of Tatarstan. Water injection in one well leaded to the water cut rise in one producer well then neighbor wells are insignificantly reacting on the pressure maintenance. On one hand low efficiency of water flooding in carbonates can be caused by hydrophobic properties of minerals like calcite and by heterogeneity of the void space including presence of fractures and caver...