Abstract
Rock
wetting
characteristics
directly
affect
the
storage
size,
security,
and
fluid
flow
behavior
in
Underground
Hydrogen
Storage
(UHS).
This
study
evaluates
impact
of
temperature
variations
on
UAE
carbonate
reservoirs
UHS
environments
its
implications
for
carbonates'
structural
residual
trapping
capacities.
A
molecular-level
discussion
variation
during
implementation
is
presented
first
time.
To
obtain
molecular
insights
into
process,
dynamics
simulations
were
carried
out
carbonate/brine/H2+
cushion
gas
systems.
calcite
substrate
was
used
as
a
representative
surface,
CO2
selected
gas.
Then,
wettability
calcite/brine/H2+CO2
evaluated
at
fixed
pressure
50
MPa,
range
323
to
388
K,
salt
concentration
15
wt.
%,
mirroring
typical
reservoir
conditions
found
UAE.
We
report
that,
low
(323
K),
presence
stream
(i.e.,
H2+CO2
mixture)
leads
reduction
hydrophilicity
due
higher
intermolecular
van
der
Waals
attraction
between
molecules,
leading
aggregation
surface.
With
increasing
temperature,
calcite-CO2
interactions
diminish,
surface
becomes
perfectly
water-wet.
It
can
be
concluded
that
compared
calcite-H2
interactions,
utilization
enhances
carbonate's
ability
trap
H2
by
filling
smaller
pores
with
brine
dissolved
molecules
while
leaving
larger
available
injected
hydrogen.
Additionally,
introducing
before
injecting
reduces
amount
hydrogen
residually
trapped,
resulting
an
enhanced
recovery
process.
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(3), P. 1713 - 1728
Published: Jan. 23, 2024
Underground
hydrogen
storage
(UHS)
is
a
promising
solution
to
meet
the
increase
in
energy
supply
and
demand
while
supporting
transition
net-zero
carbon.
The
successful
implementation
of
UHS
requires
careful
assessment
several
scientific
aspects,
among
them
evaluating
cement
stability
wellbore
integrity
ensure
safe
production
hydrogen.
Few
studies
have
evaluated
geochemical
reactivity
hydrogen;
however,
more
are
needed
explore
role
adsorption
diffusivity
behavior
with
address
associated
issues.
This
minireview
presents
state-of-the-art
advancement
impact
on
from
various
including
hydrogen/cement
interactions,
diffusivity,
current
methodologies,
experimental
setups,
additives
cushion
gases.
provides
general
comparison
between
other
gas
applications
mainly
aims
bridge
knowledge
gap
by
providing
insights
for
practical
implementations,
challenges,
future
directions
relevant
integrity.
Although
most
reviewed
reported
low
injection
stability,
further
as
technical
non-technical
factors
mechanisms
involved.
Systematic
should
be
performed
future,
which
will
assist
overcoming
existing
challenges
reducing
uncertainty
during
UHS.
Gas Science and Engineering,
Journal Year:
2024,
Volume and Issue:
126, P. 205318 - 205318
Published: April 18, 2024
The
utilisation
of
renewable
energy
has
surged
over
the
past
decades
due
to
shifts
in
climate
patterns
and
diminishing
reserves
fossil
fuels.
Among
renewables,
hydrogen
emerged
as
a
promising
clean
carrier
recent
years.
In
industry,
storage
faces
notable
hurdle
relatively
low
density
gas
(0.0813
kg/m³
at
25°C
1
atm)
its
lower
(7-27
100-400
atm).
As
potential
remedy,
underground
emerges
viable
option,
even
though
it
is
not
without
challenges.
these
challenges,
prominent
one
involves
diversity
composition
physical
properties
reservoir
influence
both
biological
geo-chemical
reactions.
this
study,
an
extensive
modelling
effort
was
undertaken
gain
insights
into
impact
bio
reactions,
variations
porosity,
depletion,
effects
diffusion
across
various
levels
salinity,
pressure,
temperature.
Diverse
Water/Rock
ratios,
distinct
minerals,
residual
gases
were
also
considered.
modelled
conditions
encompassing
mineral
parameters
led
cumulative
loss
8.38%
century.
From
this,
2.31%
identified
reactivity
rock
6.07%
aqueous
cap
reactivity.
carbonate
dissolution
most
noteworthy,
resulting
considerable
contingent
upon
presence
methanogenesis
bacteria.
per
scenario,
porosity
reduced
by
0.41%,
rock,
increased
56%,
which
could
increase
leakage.
Also,
methane
(CH4)
exhibited
favourable
characteristics
cushion
However,
it's
crucial
acknowledge
that
figures
significantly
fluctuate
based
on
composition,
bacterial
populations
their
growth,
prevailing
subsurface
conditions.
These
findings
can
serve
valuable
tool
for
comprehending
mechanisms
within
given
system.
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(11), P. 9923 - 9932
Published: May 14, 2024
Underground
hydrogen
storage
(UHS)
in
carbonate
reservoirs
is
a
suitable
solution
for
safe
and
efficient
recovery
during
the
cycling
process.
The
uncertainties
associated
with
potential
geochemical
reactions
between
hydrogen,
rock,
brine
may
impact
long-term
containment
of
produced
formations.
Despite
current
interest
studying
hydrogen-rock
reactions,
only
limited
work
available
literature.
In
this
study,
we
experimentally
evaluate
reactivity
rocks
to
address
gas
generation
induced
by
reactions.
Limestone
samples
are
treated
under
1500
psi
75
°C
temperature
duration
6
13
months
using
simple
reaction
cells.
Scanning
electron
microscopy
(SEM)
analysis
performed
examine
dissolution/precipitation
hydrogen.
contrast,
chromatography
(GC
analyzer)
inductively
coupled
plasma
optical
emission
spectroscopy
(ICP-OES)
conducted
detect
ion
precipitation.
experimental
results
indicate
no
significant
treatment
on
surface
morphology
pore
structure
even
after
treatment,
suggesting
that
abiotic
unlikely
occur
first
stages
UHS.
Furthermore,
presence
brine,
there
apparent
indications
occurring
calcite,
traces
any
other
gases
detected
treatment.
Besides,
solutions'
pH
remains
almost
unchanged,
minor
increase
calcium
(Ca2+)
ions
solution,
which
attributed
water,
not
promisingly
support
utilization
storage.
