Hydrogen-pore water relative permeability

Understanding fluid migration during and after injection is essential for predictive modelling of underground hydrogen storage in porous media. In particular, the relative permeability and capillary pressure of the H₂-brine system are key properties that determine the hydrogen flow through the reservoir. However, experimental measurements of these properties are extremely scarce at this stage due to the inherent safety concerns when working with H₂ in the lab, and the costs associated with upgrading existing facilities. Most modelling studies therefore use data from analogue fluids, e.g., nitrogen or helium, to populate their models. The assumptions is that the wetting state is similar, and the flow behaviour would mimic hydrogen. However, the validity of this assumption is not well known, and therefore experiments are required to test this.