The results of experimental and theoretical investigations of miscible displacement process of compressible fluids within fractured porous media are reported. On the basis of these studies the fluids miscible filtration mechanism within naturally fractured reservoirs is established.The influence of such factors as reservoir performance, dynamic characteristics of displacement process including displacement rates, the magnitude of rock pressure and rates of its variation on the displacement effectiveness was revealed. The considerations on the efficiency decrease of fluids extraction from fractured porous reservoirs assuming the use of different technological solutions: selection of optimal techniques of wells position, regulation and redistribution of injection rates and production rates of wells, and also cycling pressure variation within rocks are expressed.

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