Viscoelastic displacement mechanism of fluorescent polymer microspheres based on macroscopic and microscopic displacement experiments
Physics of Fluids,
Год журнала:
2025,
Номер
37(4)
Опубликована: Апрель 1, 2025
Polymer
microspheres
represent
a
novel
oil
displacement
agent
that
has
demonstrated
significant
efficacy
in
oilfields.
Recent
research
indicates
the
viscoelastic
properties
of
polymer
are
crucial
for
displacement.
To
further
elucidate
mechanism,
series
fluorescent
microspheres,
P(AM-BM-AA-[Br−Flu]),
with
varying
elasticity
were
synthesized
via
inverse
suspension
polymerization,
incorporating
monomers
derived
from
fluorescein
(Br−Flu).
The
micromorphology
and
systematically
characterized
using
an
infrared
spectrometer,
scanning
electron
microscope,
inverted
fluorescence
laser
particle
size
analyzer,
rheometer.
Through
microscopic
macroscopic
experiments,
along
microsphere
concentration
tests,
mechanism
was
investigated.
results
indicate
P(AM-BM-AA-[Br−Flu])
exhibiting
green
successfully
synthesized.
By
adjusting
crosslinker
concentration,
different
elasticities
produced.
During
process,
governs
their
migration
mode
within
pore
throats.
Microspheres
higher
exhibit
greater
sweep
efficiency.
pushing
carrying
effect
on
residual
droplets,
positive
pressure
breakthrough
resulting
trapping,
blind-end
collectively
enhance
efficiency
microspheres.
From
force
analysis
perspective,
plays
pivotal
role
improving
both
These
findings
provide
experimental
support
understanding
mechanisms
developing
new
microsphere-based
agents.
Язык: Английский
Amphiphilic polymer with ultra-high salt resistance and emulsification for enhanced oil recovery in heavy oil cold recovery production
Geoenergy Science and Engineering,
Год журнала:
2025,
Номер
unknown, С. 213920 - 213920
Опубликована: Апрель 1, 2025
Язык: Английский
Preparation and Physicochemical Properties of High-Temperature-Resistant Polymer Gel Resin Composite Plugging Material
Gels,
Год журнала:
2025,
Номер
11(5), С. 310 - 310
Опубликована: Апрель 22, 2025
Lost
circulation
has
become
one
of
the
important
problems
restricting
speed
and
efficiency
oil
gas
drilling
production.
To
address
severe
fluid
losses
in
high-temperature
fractured
formations
during
deep/ultra-deep
well
drilling,
this
study
developed
a
high-strength
gelled
resin
gel
plugging
system
through
optimized
matrix
selection,
latent
curing
agent,
flow
regulator,
filling
material,
etc.
Comparative
analysis
five
thermosetting
resins
revealed
urea-formaldehyde
as
optimal
matrix,
demonstrating
complete
at
100–140
°C
with
compressive
strength
9.3
MPa.
An
organosilicon
crosslsinker-enabled
water-soluble
achieved
controlled
solubility
flow–cure
balance
under
elevated
temperatures.
Orthogonal
experiments
identified
that
10%
agent
increased
to
6.26
MPa
while
precisely
regulating
time
2–2.5
h.
Incorporating
0.5%
rheological
modifier
imparted
shear-thinning
static-thickening
behaviors,
synergizing
pumpability
formation
retention.
The
formula
(25%
resin,
high-fluid-loss
filler,
modifier)
exhibited
superior
thermal
stability
(initial
decomposition
temperature
241
°C)
mechanical
integrity
(bearing
pressure
13.95
7
mm
wedge-shaped
fractures
140
°C).
Microstructural
characterization
confirmed
interlocking
crystalline
layers
ether-bond
crosslinking,
providing
critical
insights
for
wellbore
stabilization.
Язык: Английский
Research and Development of a High-Temperature-Resistant, Gel-Breaking Chemical Gel Plugging Agent and Evaluation of Its Physicochemical Properties
Junwei Fang,
Jian Li,
Xingen Feng
и другие.
Gels,
Год журнала:
2025,
Номер
11(5), С. 350 - 350
Опубликована: Май 8, 2025
Gas
channeling
phenomena
in
carbonate
fracture-vuggy
reservoirs
frequently
occur,
primarily
the
form
of
negative
pressure
gas
and
displacement
channeling,
with
possibility
mutual
conversion
between
two.
This
is
accompanied
by
risk
hydrogen
sulfide
(H2S)
release
from
reservoir,
which
poses
significant
challenges
to
controlling
safety.
Currently,
liquid
bridging
gel
plugging
technologies
are
effective
methods
for
mitigating
complex
issues
such
as
downhole
overflow,
fluid
loss,
heavy
oil
backflow.
paper
focuses
on
development
optimization
key
treatment
agents,
including
high-temperature-resistant
polymers
crosslinking
formulate
a
high-temperature
chemical
agent.
A
gel-breaking,
high-strength
colloidal
agent
system
capable
withstanding
temperatures
up
150
°C
was
developed,
it
has
an
apparent
viscosity
about
7500
mPa·s,
energy
storage
modulus
loss
51
Pa
6
Pa,
respectively,
after
formation
at
elevated
temperatures,
retention
rate
greater
than
82%
aging
9
d
temperature
°C.
forms
stable
isolation
barrier
wellbore,
performance
remaining
7
12
days
aging,
degradation
reaches
99.8%
24
h
technology
importance
solving
backflow
injection
recovery
wells
high-temperature,
high-pressure
reservoir
conditions.
Язык: Английский
Effect of Surface Hydrophobicity of Fluorescent Nanopolymer Microspheres on the Stability of CO2 Foam
Langmuir,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 15, 2025
Nanopolymer
microspheres
have
been
widely
studied
in
the
development
of
low-permeability
reservoirs
as
an
effective
material
to
improve
foam
stability.
However,
there
are
few
studies
on
stability
mechanism
nanopolymer
microspheres.
In
this
work,
effect
surface
hydrophobicity
fluorescent
PARC(Flu-Ac)
CO2
was
investigated
by
using
performance
evaluation
index.
The
stabilization
with
different
degrees
clarified
studying
drainage
rate,
micromorphology,
interfacial
rheology
foam,
and
adsorption
behavior
liquid
film.
results
show
that
PARC(Flu-Ac)-5
neutral
wettability
best
effect.
At
94
°C,
volume
is
630
mL
half-life
30.12
min.
a
high
desorption
energy
can
stably
adsorb
at
gas-liquid
interface
form
solid
layer.
mechanical
strength
reduce
direct
contact
fluid,
thus
providing
space
resistance
for
thinning
film
diffusion
gas
between
bubbles.
addition,
slow
rate
through
release
free
water.
significantly
improved.
This
study
further
clarifies
enhancement
which
has
excellent
guiding
significance
application
oil
fields.
Язык: Английский
Construction of Low-Energy Prepared Highly Stable Surfactant Emulsion by Optimizing Composition Configuration
Langmuir,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 23, 2025
Emulsion
systems
that
are
independent
of
preparation
conditions
and
time
ideal
models
for
fundamental
emulsion
research.
However,
special
strategies
required
to
form
these
emulsions,
particularly
with
commonly
used
oils
emulsifiers
have
proven
be
more
difficult.
In
this
study,
an
efficient
approach
preparing
a
low-energy
outstanding
stability
is
reported.
This
derived
from
comprehensive
study
the
component
composition
in
residual
emulsified
fractions
water-separation
emulsions.
The
outstandingly
stable
exhibits
highly
stacked
droplet
structure,
which
can
restrict
movement
within
disperse
medium,
accompanied
by
oil-water
interface
layer,
hinder
molecular
exchange
between
droplets
resist
destruction
under
extreme
conditions,
thereby
preventing
demulsification
caused
sedimentation,
coalescence,
Ostwald
ripening.
These
peculiarities
enable
remain
over
long
periods
at
elevated
temperatures,
even
exhibiting
spontaneous
tendency
recover
after
centrifugal
phase
splitting.
lends
itself
generalization
context
multiple
surfactants
or
oil
phases,
thus
establishing
foundation
various
functional
Moreover,
low-energy-input
reduce
energy
consumption
production,
aligning
principles
green
development.
Язык: Английский