The interest in the problem of the filtration of two-phase fluids modeling gas-condensate mixtures is caused by necessity to intensify the extraction of gas-condensate—valuable hydrocarbon feedstock consisting of methane and its higher derivatives. There are various flow regimes including oscillation one during the operation of the gas-condensate field. It is shown that wave impact on the mixture consisting of light hydrocarbons can lead to increasing of integral flowrate of the mixture under isothermal conditions. The results of experimental studies of methane–n-pentane mixture filtration in the porous medium under isothermal conditions in the pressure range typical for the natural thermobaric conditions of gascondensate reservoirs are shown. The effect of the periodic pressure oscillations at the output of the experimental section on the integral flowrate of the methane–n-pentane mixture is discussed.