Abstract
Subsurface hydrogen (H2) storage is a promising way to balance supply fluctuations of intermittent renewable energies (say, solar or wind). Issues including the heterogeneity of geological formations and two-phase flow mechanics may have a significant impact on the flow behaviour of H2 within the porous medium and may potentially degrade the subsequent recovery performance. Therefore, a fullcompositional modelling study, using a very fine numerical grid to resolve the details of the flows, was conducted to analyze these risks and to understand the fundamental hydrodynamic mechanisms of H2 storage. We performed a range of 2D vertical simulations at a sector scale (10m×80m) to investigate the detailed flow behaviour of H2 with carbon dioxide (CO2) as cushion gas in heterogeneous systems. We observed that H2 could infiltrate the cushion gas in the proximity of the injectors, meaning that CO2 is not displaced away from the injectors in a piston-like fashion, as driven by the greater heterogeneity. As a result, under certain conditions, the purity of the back produced H2 may be much degraded. On the other hand, the overall storage performance of CO2 is generally good (>95%) and is much less affected by the permeability heterogeneity.
Original language | English |
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Title of host publication | 2nd Geoscience and Engineering in Energy Transition Conference 2021 |
Publisher | EAGE Publishing BV |
Pages | 1-5 |
Number of pages | 5 |
ISBN (Electronic) | 9781713845324 |
DOIs | |
Publication status | Published - 2021 |
Event | 2nd EAGE Geoscience and Engineering in Energy Transition Conference 2021 - Virtual, Online Duration: 23 Nov 2021 → 25 Nov 2021 |
Conference
Conference | 2nd EAGE Geoscience and Engineering in Energy Transition Conference 2021 |
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Abbreviated title | GET 2021 |
City | Virtual, Online |
Period | 23/11/21 → 25/11/21 |
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Civil and Structural Engineering