Compositional Simulation of Hydrogen Storage with Carbon Dioxide Cushion Gas in Subsurface Heterogeneous Porous Media

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

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 Hwithin 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 Hstorage. We performed a range of 2D vertical simulations at a sector scale (10m×80m) to investigate the detailed flow behaviour of Hwith carbon dioxide (CO2) as cushion gas in heterogeneous systems. We observed that Hcould infiltrate the cushion gas in the proximity of the injectors, meaning that COis 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 Hmay be much degraded. On the other hand, the overall storage performance of COis generally good (>95%) and is much less affected by the permeability heterogeneity.

Original languageEnglish
Title of host publication2nd Geoscience and Engineering in Energy Transition Conference 2021
PublisherEAGE Publishing BV
Pages1-5
Number of pages5
ISBN (Electronic)9781713845324
DOIs
Publication statusPublished - 2021
Event2nd EAGE Geoscience and Engineering in Energy Transition Conference 2021 - Virtual, Online
Duration: 23 Nov 202125 Nov 2021

Conference

Conference2nd EAGE Geoscience and Engineering in Energy Transition Conference 2021
Abbreviated titleGET 2021
CityVirtual, Online
Period23/11/2125/11/21

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering

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