Physics of Fluids,
Год журнала:
2024,
Номер
36(11)
Опубликована: Ноя. 1, 2024
Comprehensive
characterization
of
pore
structure
and
fluid
distribution
is
beneficial
for
efficiently
exploring
developing
low-permeability
sandstone
reservoirs.
As
a
conversion
parameter,
the
surface
relaxivity
significant
characterizing
porous
media
evaluating
mobility.
The
indicates
strength
interaction
between
solid
during
relaxation
process.
This
paper
conducts
mercury
intrusion
porosimetry,
low-temperature
nitrogen
adsorption,
nuclear
magnetic
resonance-centrifugation
experiments
on
sandstones,
providing
insight
into
evolution
size
water
content
distribution.
Combining
porosimetry
with
resonance,
samples
measured
to
be
9.57–23.79
μm/s.
ranges
from
0.70
3.72
μm/s
utilizing
adsorption
resonance.
Based
movable
saturation
through
critical
radius,
calculated
relaxivities
using
two
methods
are
compared.
result
that
determined
by
smaller
than
obtained
porosimetry.
attributed
overestimating
ratio
volume
in
which
difficult
capture
information
about
macropores.
Conversely,
similar
principle
centrifugation
leads
consistent
saturation,
minimizing
discrepancies
relaxivity.
Therefore,
porosimetry-nuclear
resonance
more
suitable
mobility
sandstones.
In
addition,
ink-bottle
effect
retains
macropore
experiments.
With
continued
water
injection
development,
most
oilfields
have
entered
high
and
ultra-high
water-cut
stages.
To
address
the
issue
of
poor
thermal
salt
resistance
in
conventional
polymer
flooding
systems,
a
salt-tolerant
amphiphilic
polymer-based
supramolecular
inclusion
system
was
developed,
incorporating
surfactant
as
synergistic
agent
to
reduce
oil–water
interfacial
tension
(IFT)
further
increase
viscosity.
In
this
study,
viscosity
were
used
evaluation
indicators
optimize
formulation
enhanced
system.
The
effects
factors
such
temperature,
inorganic
salts,
pH
on
apparent
systematically
examined.
Dynamic
light
scattering
one-dimensional
core
physical
model
employed
study
emulsification
performance
oil
displacement
efficiency
results
indicate
that
exhibits
excellent
thickening
ability
IFT
reduction
under
high-temperature
high-salinity
conditions
(85
°C,
20
×
104
mg·L−1).
rheological
properties
capability
are
both
pH-responsive,
with
optimal
observed
neutral
alkaline
conditions,
suggesting
broad
application
range.
not
only
reduces
cut
but
also
improves
oil-washing
through
emulsification,
achieving
an
ultimate
recovery
rate
60.13%
(EOR)
24.75%.
These
findings
demonstrate
is
promising
alternative
for
enhancing
reservoirs.
Journal of Dispersion Science and Technology,
Год журнала:
2025,
Номер
unknown, С. 1 - 20
Опубликована: Фев. 12, 2025
During
the
soaking
process
after
hydraulic
fracturing
in
tight
reservoirs,
imbibition
between
matrix
and
fracture
is
an
important
mechanism
for
enhancing
oil
recovery.
The
pressure
acts
on
matrix-fracture
system
form
of
external
difference
to
establish
a
dynamic-imbibition
process.
In
this
study,
core-scale
numerical
model
developed
based
experimental
data
study
under
non-zero
initial
water
saturation
quantitatively.
simulation
results
show
that
enhancement
extent
capillary
mobilization
more
significant
conditions
higher
difference.
Furthermore,
contributions
spontaneous
(SI)
forced
(FI)
are
8.74%
91.24%
respectively.
Then,
effects
oil-water
viscosity
ratio
(VROW),
(MIWS),
SI
FI
analyzed
depth.
As
MIWS
increases
from
0.27
(bound
water)
0.3,
decrease
by
64.43%
10.01%.
increase
VROW,
MIWS,
number
tends
enhance
contribution
FI.
This
work
pivotal
gaining
profound
insights
into
improving
recovery
through
development.
ACS Omega,
Год журнала:
2025,
Номер
10(12), С. 12530 - 12542
Опубликована: Март 20, 2025
To
optimize
the
shut-in
time
for
hydraulic
fracturing
assisted
oil
displacement
in
offshore
low-permeability
reservoirs,
a
coupled
mathematical
model
encompassing
injection,
well,
and
production
is
established.
The
accuracy
of
validated
using
data.
law
pressure
diffusion
oil–water
two-phase
flow
during
well
process
clarified,
mechanism
to
enhance
recovery
summarized.
sensitivity
analysis
conducted,
then
main
controlling
factors
affecting
optimal
are
identified.
research
results
indicate
that
primary
function
effect
formation
energy
supplementation
after
thereby
further
increasing
swept
volume,
greater
geological
reserves,
ultimately
enhancing
recovery.
During
initial
stage
larger
portion
reserves
controlled
mainly
by
fluid
diffusion,
while
later
stage,
exchange
achieved
imbibition
effect.
cumulative
injection
coefficient
before
displacement,
permeability,
which
should
be
given
special
attention
on
site.
provide
theoretical
basis
design
operations
reservoirs.
Slickwater
(SW)
fracturing
fluid,
renowned
for
its
excellent
drag
reduction
effect
in
wellbores,
is
widely
used
the
hydraulic
process
of
low-permeability
reservoirs.
However,
poor
imbibition
performance
conventional
slickwater
fluid
constrains
utilization
oil
within
matrix
pores.
Herein,
a
nanoslickwater
with
exceptional
recovery
capability
constructed
by
incorporating
nano-SiO2
containing
carboxyl
and
sulfonic
acid
groups
into
fluid.
The
including
reduction,
rheological
properties,
filtration
loss,
formation
damage,
systematically
evaluated.
Finally,
regulation
system
explained.
prepared
pseudoplastic
rate
74.53%
at
80
°C.
retention
ability
as
high
96.73%
(after
shearing
30
min).
exhibits
resulting
damage
to
reservoir
only
7.70%.
Core
results
indicate
that
produced
initial
rapid
stage
accounts
over
65.00%
entire
process.
After
nanoparticles
are
introduced,
increases
significantly.
final
from
17.31
28.22%.
can
effectively
meet
requirements
possesses
ability,
holding
great
application
potential
efficient
development
tight
Energy Sources Part A Recovery Utilization and Environmental Effects,
Год журнала:
2024,
Номер
46(1), С. 15791 - 15807
Опубликована: Ноя. 8, 2024
In
the
development
of
low-permeability
tight
oil
reservoirs,
fracturing-flooding
technology,
with
its
dual
advantages
"fracture
creation
and
energy
replenishment,
displacement
by
imbibition,"
effectively
addresses
challenges
such
as
poor
water
injection
low
recovery.
However,
mechanism
oil-water
migration
within
reservoir
enhanced
recovery
during
shut-in
imbibition
process
remain
unclear,
construction
parameters
are
primarily
based
on
empirical
data.
this
study,
focusing
Y
block
in
Bohai
Bay
Basin,
eastern
China,
we
conducted
dynamic
experiments
utilized
nuclear
magnetic
resonance
(NMR)
technology
to
analyze
key
factors
influencing
imbibition-driven
microscopic
mechanisms
pore
space.
Numerical
simulation
was
then
employed
optimize
for
operations.
The
results
indicate
that
occur
medium-sized
pores,
while
connectivity
micro-
small-sized
pores
leads
suboptimal
effects.
provides
favorable
conditions
displacement,
allowing
small
medium
be
further
displaced
into
fractures.
main
affecting
efficiency
include
core
permeability
(optimal
range:
1.5
mD
4
mD),
fracture
length
(approximately
2/3
length),
fluid
concentration
around
0.2%),
time
24
48
hours).
Based
production
capacity
simulations,
optimal
an
rate
1152
1440
m3/min,
a
total
volume
20,000
25,000
m3,
30
45
days.
application
these
optimized
resulted
increase
average
daily
from
4.4
tons
7.7
tons,
demonstrating
significant
enhancement
productivity
