Investigating the effect of fracture-matrix interaction in underground gas storage process at condensate naturally fractured reservoirs

The primary objective of this study is to determine the fracture influence on fractured reservoir simulation, as compared to matrix in underground gas storage. The water production, gas invasion in the reservoir during injection, condensate production, and relative permeability which are known to have high impact on the gas behavior are all affected by the changes in the system used for model construction. The results of this study show that although petrophysical properties, the volume of gas in place, and reservoir pressure drop are the same during reservoir depletion, different storage capacities and injectivity are predicted in gas storage periods. Fractures result in wider spread of injected gas (improvement of injected gas invasion) in the field and gas movement is easier during injection and production periods, mainly owing to the absence of water in fractures.