Geochemical influences of hydrogen storage in depleted gas reservoirs with N2 cushion gas

Nasiru Salahu Muhammed, Bashirul Haq*, Dhafer Al Shehri, Abduljamiu Amao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Geochemical investigation of hydrogen (H2), brine, rock formations, and residual gases (nitrogen – N2, methane – CH4, and carbon dioxide – CO2) is crucial for understanding H2 storage processes in depleted gas reservoirs. This study examines the effects of injecting a gas mixture (60% H2 + 30% N2 + 5% CH4 + 5% CO2) into Bandera Grey sandstone with notable clay mineral content. The experiment lasted 50 days at 42 °C, 1350 psi, and 5 wt% NaCl brine, with detailed analytical characterization before and after aging. Results show minimal sample reactivity, causing slight alterations in petrophysical characteristics. Dissolution primarily affected dolomite and barite minerals, while illite and kaolinite caused pore blockage. Gas chromatography data indicate only 0.45% of injected H2 is lost (via dissolution in brine and reaction with CO2), CH4 increased by 6.22%, N2 remained stable, and CO2 decreased by 1%. These results provide valuable insights into the feasibility and safety of utilizing depleted gas reservoirs for H2 storage.

Original languageEnglish
Pages (from-to)782-792
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume87
DOIs
StatePublished - 18 Oct 2024

Bibliographical note

Publisher Copyright:
© 2024

Keywords

  • Cushion gas
  • Depleted natural gas reservoirs
  • Dissolution
  • Geochemical
  • Hydrogen
  • Precipitation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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