The growth of gas consumption associated with the Russian regions gasification requires the construction of new underground gas storages (UGS) and increase existing gas storages capacity. The creation of new underground gas storages and the expansion of existing ones involve expensive investments. The most significant items of expenditure are the costs of cushion gas injection, which is necessary to maintain reservoir pressure and UGS capacity during gas extraction period. The gas provides a “dry” region within the location of production wells and forms a transition zone at the gas-water contact under the elastic-water drive. The size of the transition zone in the area of the gas-water contact and the irreducible cushion gas volume required for its formation depend on the type of reservoir and its filtration and capacity properties. During modeling reservoir processes in cycles of gas injection and gas extraction from UGS, gas and water filtration is characterized by hysteresis of relative phase permeability (RPP) dependencies. There is also a shift for relative permeability curves when creating UGS. It has been observed in filtration processes (injection or extraction of gas) of the same flow direction. The paper presents the results of laboratory experiments on filtration modeling of counter-directional filtration flows of gas and water in a carbonate reservoir with an active aquifer in order to determine the number of cycles required to stabilize the position of the relative permeability curves and the points of residual gas and water saturation when modeling injection and production gas from UGS.