Effect of Hydrogen Interaction with Crude Oil on the Extraction of Hydrogen if Stored in Depleted Shale Reservoirs: An Experimental Study Analyzing the Outcome of Cyclic Hydrogen Injection into Oil-saturated Core Samples

Elie Bechara, Talal Gamadi, Marshall Watson, Aboubakar Mahamadene, Seyedhossein Emadibaladehi, Athar Hussain, Ion Ispas

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Abstract

One of the main challenges of underground hydrogen storage in porous media (UHSP) is ensuring efficient hydrogen extraction after long storage periods. Unconventional shale resources have contributed towards 65% of the US crude oil production in 2021. Thus, if we are to explore possibility of efficient UHSP in depleted oil-producing shale reservoirs, we should ascertain if hydrogen interaction with residual oil, throughout the storage period, leads to recovering undesirable amounts of oil during hydrogen extraction.<br>Cyclic hydrogen injection can be indicative of hydrogen recovery after extraction. The process consists of saturating core samples of different major shale formations with crude oil, at in-situ conditions. Different saturations are achieved for quasi-identical samples. Oil wettability is measured before a sample is subjected to compressed hydrogen injected at a pressure high enough to infiltrate the formation, using a core-flooding system. Hydrogen is kept inside the sy
Original languageEnglish
StatePublished - Jun 21 2023

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