Hydrogen induced changes in the phase composition and micro-structure of downhole cements: Fundamental research within the context of underground hydrogen storage
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In: International Journal of Hydrogen Energy, Vol. 89.2024, No. 4, 03.10.2024, p. 1166–1175.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Hydrogen induced changes in the phase composition and micro-structure of downhole cements
T2 - Fundamental research within the context of underground hydrogen storage
AU - Sammer, Thomas
AU - Kostoglou, Nikolaos
AU - Ravi, Krishna
AU - Raith, Johann G.
N1 - Publisher Copyright: © 2024 The Authors
PY - 2024/10/3
Y1 - 2024/10/3
N2 - Underground hydrogen storage (UHS) promises great storing potential for energy produced from renewables. To make UHS a feasible and safe process, fundamental research investigating the integrity of the cement sheath applied in boreholes against hydrogen exposure is essential. In this study, hydrothermal autoclave experiments are conducted to evaluate hydrogen induced changes in the mineralogical phase composition and the microstructure of a class G cement. X-ray diffraction and scanning electron microscopy combined with nitrogen adsorption/desorption experiments are carried out. Only minor mineralogical changes are observed such as the decomposition of monosulphate and the formation of ettringite. Nitrogen adsorption/desorption experiments reveal comparable pore size distributions with minor differences in porosity and surface area. The findings of this study suggest that hydrogen does not substantially affect the phase composition and microstructure of the investigated low permeable class G cement sheath emphasizing the relatively unreactive nature of downhole cements of this type against hydrogen.
AB - Underground hydrogen storage (UHS) promises great storing potential for energy produced from renewables. To make UHS a feasible and safe process, fundamental research investigating the integrity of the cement sheath applied in boreholes against hydrogen exposure is essential. In this study, hydrothermal autoclave experiments are conducted to evaluate hydrogen induced changes in the mineralogical phase composition and the microstructure of a class G cement. X-ray diffraction and scanning electron microscopy combined with nitrogen adsorption/desorption experiments are carried out. Only minor mineralogical changes are observed such as the decomposition of monosulphate and the formation of ettringite. Nitrogen adsorption/desorption experiments reveal comparable pore size distributions with minor differences in porosity and surface area. The findings of this study suggest that hydrogen does not substantially affect the phase composition and microstructure of the investigated low permeable class G cement sheath emphasizing the relatively unreactive nature of downhole cements of this type against hydrogen.
KW - Cement sheath integrity
KW - Cement-hydrogen interaction
KW - Mineralogical phase analysis
KW - Underground hydrogen storage
UR - https://doi.org/10.1016/j.ijhydene.2024.09.449
UR - http://www.scopus.com/inward/record.url?scp=85205347782&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2024.09.449
DO - 10.1016/j.ijhydene.2024.09.449
M3 - Article
VL - 89.2024
SP - 1166
EP - 1175
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 4
ER -
