Increasing greenhouse gas emissions have put pressure
on global
economies to adopt strategies for climate-change mitigation. Large-scale
geological hydrogen storage in salt caverns and porous rocks has the
potential to achieve sustainable energy storage, contributing to the
development of a low-carbon economy. During geological storage, hydrogen
is injected and extracted through cemented and cased wells. In this
context, well integrity and leakage risk must be assessed through
in-depth investigations of the hydrogen–cement–rock
physical and geochemical processes. There are significant scientific
knowledge gaps pertaining to hydrogen–cement interactions,
where chemical reactions among hydrogen, in situ reservoir fluids,
and cement could degrade the well cement and put the integrity of
the storage system at risk. Results from laboratory batch reaction
experiments concerning the influence of hydrogen on cement samples
under simulated reservoir conditions of North Sea fields, including
temperature, pressure, and salinity, provided valuable insights into
the integrity of cement for geological hydrogen storage. This work
shows that, under the experimental conditions, hydrogen does not induce
geochemical or structural alterations to the tested wellbore cements,
a promising finding for secure hydrogen subsurface storage.