_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 225606, “Numerical Study of Storage of Hydrogen/Natural Gas Mixtures in Underground Gas Repositories: Effect of the Gas Composition on System Behavior and Energy Recovery, ” by Tianjia Huang, SPE, George J. Moridis, SPE, and Thomas A. Blasingame, SPE, Texas A these dynamics must be evaluated from the perspective of reservoir simulation. Salinity also plays a crucial role in the performance of UGS, particularly in deep saline aquifers. Salinity can affect gas dissolution, wettability, and liquid/gas interfacial tension, further altering gas displacement and gas saturation. Increasing salinity results in lower gas solubility, greater brine viscosity, and higher gas/brine interfacial tension values, all of which influence gas injection, storage, and withdrawal efficiency. Numerical simulation studies aim to investigate the underground storage of HNM using high-resolution grids. A complete 1-year storage cycle, encompassing gas injection, resting, and withdrawal phases, is simulated to, first, compare the reservoir response and energy-recovery efficiency of underground storage of HNM with varying H2 mass fractions but equivalent energy content, and second, to analyze the effect of aquifer salinity on HNM storage operations. This synopsis concentrates on the study’s numerical simulation and problem description, with the results of the study described in the “Conclusions” section; a detailed discussion of the simulation results is provided in the complete paper.
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