Numerical analysis of bio-methanation process during underground hydrogen storage

G. Wang, G. Pickup, K. Sorbie, E. Mackay

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Geological formations can provide cost-effective storage capacity at scale and therefore are increasingly considered for hydrogen (H2) storage. However, H2 may trigger the bio-methanation process when carbon dioxide (CO2) is used as cushion gas. This process may lead to H2 loss and the contamination of the back produced gas. The impact of the methanation process on the H2 recovery performance is analysed using a series of fine-scale numerical flow simulations. A gravity-dominated operational strategy is designed to mimic seasonal H2 supply-demand patterns. Although gravity can drive the segregation between H2 and CO2, permeability heterogeneities lead to flow dispersions and gas mixing. In turn, they provide the base condition (local mixing of H2 and CO2) for the subsequent methanogenesis to occur. In one scenario, approximately 30% of H2 has been converted to CH4 using a methanation rate from the literature. Compared with the case without methanogenesis, H2 recovery is reduced by 17% and 26% with reference to H2 purity levels of 98% and 90% in the case with methanogenesis considered. Water-breakthrough also occurs when the methanogenesis is activated. This is because of the decrease in the total gas volume and the newly formed water, as a result of the methanation reaction.

Original languageEnglish
Title of host publication3rd EAGE Global Energy Transition 2022
PublisherEAGE Publishing BV
Pages115-119
Number of pages5
ISBN (Electronic)9781713863618
DOIs
Publication statusPublished - 7 Nov 2022
Event3rd EAGE Global Energy Transition Conference and Exhibition 2022 - The Hague, Netherlands
Duration: 7 Nov 20229 Nov 2022

Conference

Conference3rd EAGE Global Energy Transition Conference and Exhibition 2022
Abbreviated titleGET 2022
Country/TerritoryNetherlands
CityThe Hague
Period7/11/229/11/22

ASJC Scopus subject areas

  • General Earth and Planetary Sciences
  • Energy Engineering and Power Technology

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