Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(11)
Published: Nov. 1, 2024
The
global
energy
imbalance
has
created
significant
challenges
and
environmental
consequences.
Integrating
carbon
sequestration
with
shale
gas
development
provides
a
promising
solution
to
address
both
issues
simultaneously.
This
study
explores
the
adsorption,
desorption,
diffusion
behaviors
of
methane
CO2
in
pores
using
high-precision,
high-pressure
adsorption
apparatus
alongside
molecular
simulation
techniques.
Results
demonstrate
that
shows
markedly
higher
capacity
than
methane,
particularly
at
high
pressures.
Simulations
reveal
molecules
nearly
saturate
pore
spaces
pressures
above
10
MPa.
Methane's
coefficient,
initially
low
pressures,
drops
sharply
increasing
pressure,
decreasing
by
approximately
90%
from
5.6
×
10−10
m2/s
154
psi
1.38
10−11
1032
psi.
Conversely,
remains
stable
under
pressure
changes,
suggesting
is
constrained
intermolecular
interactions
while
retains
movement.
Under
reservoir
condition
30
MPa
adsorbed
CH4,
injection
varying
continues
enhance
underscoring
CO2's
dual
role
boosting
recovery
achieving
sequestration.
highlights
CO2-methane
displacement
mechanisms,
providing
theoretical
insight
support
effective
storage.
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 19, 2024
The
connectivity
and
accessibility
of
the
coal
pore
network
structure
determine
mechanism
CBM
storage
migration,
which
is
crucial
significance
for
efficient
utilization
as
well
mine
safety
disaster
prevention.
This
study
employed
multitechniques
mercury
intrusion,
physisorption,
low-field
NMR
to
comprehensively
characterize
morphological
original
tectonic
coals
with
metamorphism.
Additionally,
different
from
limitations
qualitative
analyses
connectivity,
this
proposes
a
quantitative
characterization
method
constricted
based
on
response
index
λ,
thus
supplementing
expanding
evaluation
methods
connectivity.
research
findings
indicate
that
compared
coal,
exhibits
stronger
adsorption
capacity
instant
desorption
ability.
Moreover,
development
meso-
macropores
in
more
pronounced,
indicating
may
be
sensitive
pore-enhancing
behavior
tectonics.
After
centrifugation,
T2
relaxation
curve
could
reveal
significant
residual
water,
illustrating
presence
configurations
composed
interconnected
semiopen
pores
restricted
by
throats
cause
rapid
decline
under
capillary
barrier
effects.
Similarly,
hysteresis
loops
injection-ejection
curves
physisorption
isotherm
closely
related
such
configuration.
tectonism,
tortuosity
pore-to-throat
ratio
middle-high-ranked
decreased
2.211
1.121
2.186
0.829,
respectively.
Meanwhile,
λ
values
low-ranked
increased
22.0%
16.8%,
These
changes
tectonism
has
modified
thereby
enhancing
internal
gas
migration
pathways
ultimately
strengthening
network.
above-mentioned
results
provide
guidance
uncovering
abnormal
enrichment
disaster.
ACS Omega,
Journal Year:
2024,
Volume and Issue:
9(24), P. 26336 - 26346
Published: June 9, 2024
The
retention
of
coal
fines
in
propped
fractures
impedes
the
efficient
flow
gas
and
water,
leading
to
a
substantial
decrease
seam
permeability
production
efficiency.
In
this
article,
fine
plugging
removal
agent
with
good
dispersion
stability
powerful
powder-carrying
capacity
was
developed
study
enhancement
fracture.
results
show
that
0.8%
SDS
+
0.4%
NaCl
BS-12
most
effective
compounding
system.
Increasing
injection
rate
performing
recycles
intermittent
unblocking
when
it
used
as
will
effectively
enhance
gas-liquid
two-phase
improve
release
retained
fines.
After
three
unblocking,
discharging
can
be
increased
more
than
90%,
resulting
3.88
times
increase
compared
single
cycle.
This
method
has
important
practical
significance
theoretical
value
for
solving
problem
ensuring
stable
discharge
coalbed
gas-water-coal
