One of the main challenges of underground hydrogen storage in porous media (UHSP) is ensuring efficient hydrogen extraction after long storage periods. If the possibility of efficient UHSP in depleted oil-producing shale reservoirs is to be explored, it should be ascertained whether hydrogen interaction with residual oil throughout the storage period leads to recovering undesirable amounts of oil during hydrogen extraction. The study detailed in the complete paper adds to the ongoing research in hydrogen storage, focusing on efficient extraction of hydrogen to be stored potentially in depleted unconventional formations.
Materials and Methods
Core-Sample Preparation. Cylindrical core samples were prepared with a 1.5-in. diameter and a 3-in.
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