Hydrogen-brine interfacial tension at subsurface conditions: Implication for hydrogen geo-storage

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Summary Underground hydrogen storage is a promising technique to store a high volume of hydrogen in deep geological formations that can be recovered for energy generation if there is a need. The interaction between the hydrogen and resident formation brine can strongly influence the design and implementation of underground hydrogen storage. In this regard, the interfacial tension between hydrogen and formation brine is an important factor that affects the pore-scale hydrogen distribution and storage capacity. However, the experimental data for the interfacial tension of hydrogen with brine in subsurface conditions are scarce, and thus far, a limited number of studies have measured the interfacial tension between hydrogen and brine. Therefore, herein, an explicit correlation was proposed to calculate the interfacial tension of hydrogen and brine systems at different geo-storage conditions. The developed model is a function of the temperature, pressure, and salinity of the brine. The overall error analysis for the model exhibits fair agreement with the reported experimental data. The developed model outperformed the published correlations in the literature and resulted in R squared and AAPRE values of 0.997 and 0.738, respectively.

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