Processes,
Journal Year:
2023,
Volume and Issue:
11(11), P. 3130 - 3130
Published: Nov. 1, 2023
The
physical
properties
of
coal
reservoirs
are
the
main
restrictions
to
exploration
and
development
Coalbed
methane
(CBM).
study
characteristics
their
controlling
factors
is
great
significance
safe
efficient
utilization
CBM
resources
in
mining
area.
Pingdingshan
No.
10
mine
was
chosen
for
this
because
its
better
gas
production
effect
at
test
wells.
reservoir
seams
were
tested
analyzed
comprehensively
evaluate
properties,
studied.
results
indicate
following:
(1)
content
purity
4
seam
significantly
higher
than
2
seam,
therefore
they
have
potential
seam.
(2)
average
adsorption
time
less
that
making
it
easier
reach
peak
capacity
wells
short
term,
but
not
conducive
long-term
stable
CBM.
Langmuir
volume
samples
greater
seam;
however,
contains
about
three
times
amount
(3)
All
high
porosity,
which
favorable
large
amounts
storage.
Micropores
predominated;
transitional
pores
frequent,
a
few
mesopores
occurred;
macropores
least
common.
Samples
from
contained
highest
proportion
micropores.
(4)
Organic
common
all
samples,
with
pore
diameters
more
30
µm,
mainly
concentrated
between
50.5
1000
nm.
Microfractures
apertures
70
nm
relatively
50–65
range.
A
number
nanoscale
microfractures
curved
or
jagged.
(5)
Fractures
widths
50
20
µm
developed,
many
filled
kaolinite,
quartz,
other
minerals.
(6)
mostly
layered
silicate
minerals
(kaolinite),
hard
granular
(quartz)
next,
very
small
quantity
iron-type
minerals,
such
as
siderite
pyrite
dendritic
form.
can
provide
reference
basis
large-scale
subsequent
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(8)
Published: Aug. 1, 2024
Coalbed
methane
(CBM)
content
is
a
crucial
parameter
for
CBM
exploitation
and
disaster
prevention,
with
accurate
gas
loss
calculation
being
essential
improving
measurement
precision.
To
investigate
the
physical
response
to
quantify
impact
interrelation
of
various
factors,
this
study
developed
comprehensive
model
incorporating
effects
diffusion,
temperature,
pressure
on
porosity
coal
deformation.
By
utilizing
OpenFOAM
platform
C++
numerical
solution
development
establishing
an
experimental
system
measurement,
model's
reliability
was
confirmed.
The
new
demonstrates
8.56%
average
error,
representing
significant
improvement
over
traditional
methods,
error
reductions
26.59%
18.31%
compared
square
root
time
power
function
respectively.
hierarchy
determined
be
flow
>
gas-coal
deformation
coupling
gas-temperature
deformation-temperature
coupling.
Average
diffusion
contributions
are
identified
as
41.43%
from
surface
30.71%
Knudsen
27.86%
viscous
flow.
factors
affecting
loss,
in
decreasing
order
impact,
adsorption
equilibrium
pressure,
porosity,
moisture,
constants.
These
findings
provide
theoretical
support
enhancing
accuracy
techniques,
significantly
benefiting
extraction
mine
safety.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(12)
Published: Dec. 1, 2024
The
research
and
analysis
on
the
heterogeneous
characterization
of
adsorbed
methane
in
coal
at
molecular
scale
has
not
yet
been
fully
explored.
In
this
paper,
complex
system
structure
was
constructed
based
Langmuir
adsorption
equation
simulation.
A
fractal
model
to
analyze
distribution
established,
principle
method
proposed
is
specifically
derived
summarized.
quantization
relation
between
dimension
(Df)
for
pressure
(P)
which
similar
variation
capacity
with
equation.
This
achieved
a
breakthrough
by
further
revealed
control
over
behavior.
provides
insight
into
deeper
understanding
gas
mechanism
coal-based
or
carbon-based
materials,
conducive
creating
significant
basis
novel
design
strategies
materials.
Processes,
Journal Year:
2025,
Volume and Issue:
13(3), P. 771 - 771
Published: March 7, 2025
To
investigate
the
ultra-microstructural
characteristics
and
adsorption
properties
of
coal
pores,
pore
structure
Dongsheng
lignite
Chengzhuang
anthracite
in
Qinshui
Basin
was
characterized
by
liquid
nitrogen
method.
It
found
that
SSA
micropores
constituted
more
than
65%
total
both
samples.
The
macromolecular
model
N2
molecular
probe
were
used
to
obtain
ultrastructure
parameters,
gas
behaviors
two
coals
under
different
conditions
simulated
Grand
Canonical
Monte
Carlo
(GCMC)
Molecular
Dynamics
(MD).
results
show
pores
are
mainly
small
while
micropores.
specific
surface
area
constitutes
ultra-micropores.
capacity
CH4
is
consistently
higher
lignite.
amount
positively
correlated
with
volume.
This
indicates
concentrated
increases
increase
pressure
decreases
temperature.
In
competitive
CH4/CO2/H2O,
quantity
order
H2O
>
CO2
CH4.
research
provide
a
theoretical
basis
for
coalbed
methane
exploitation
replacement.
