Tyumen State University Herald Physical and Mathematical Modeling Oil Gas Energy,
Год журнала:
2023,
Номер
9(1), С. 139 - 152
Опубликована: Апрель 14, 2023
In
the
oil
industry,
balls
are
used
in
process
of
hydraulic
fracturing
(HF).
The
material
that
meets
basic
requirements
for
HF
is
magnesium.
Soluble
magnesium
designed
to
activate
couplings.
When
coupling
seat
reached,
during
pumping
fluid,
ball
temporarily
blocks
passage
section
inside
shank
column,
which
makes
it
possible
create
excess
pressure
and
open
windows
coupling.
However,
since
has
a
low
density,
drilling
fluids
with
high
leaky
contact
valve
due
insufficient
gravity.
This
may
lead
leakage
working
fluid.
purpose
work
study
method
manufacturing
aimed
at
weighing
down.
developed
two-layer
element
by
stamping
described.
consists
shell,
steel
placed.
A
placed
cylindrical
glass
bottom,
closed
lid.
resulting
composite
assembly
deformed
being
compressed
two
punches
ends
form
hemispheres
until
cup
tightly
closed.
As
variant,
shell
proposed
be
made
Mg90
grade
It
theoretically
established
mass
bimetallic
2.74
times
larger
than
ball.
Modeling
billet
performed
order
establish
possibility
obtaining
according
method.
stress-strain
state
shaping
considered.
Successful
computer
simulation
gives
grounds
recommend
implementation
real
experiment.
smallest
value
ratio
cylinder
wall
thickness
its
height
also
established,
ensures
stability
deformation.
ACS Omega,
Год журнала:
2024,
Номер
9(16), С. 18542 - 18555
Опубликована: Апрель 8, 2024
Fracture
propagation
with
temporary
plugging
hydraulic
fracturing
in
tight-oil
reservoirs
is
simulated
this
study.
The
research
considers
dynamic
fluid
redistribution,
stress
differences
among
multiple
fractures.
fracture
morphology
during
staged
(TPSF)
investigated
by
using
a
user-defined
perforation
element
combined
pore-pressure
finite-element
model.
precision
of
the
integrated
model
verified
standard
approach.
Then,
case
studies
are
presented
to
investigate
influence
cluster
spacing,
horizontal
difference
coefficients
(SDC),
injection
rates,
and
barrier
tensile
strengths.
simulation
results
show
that
central
fractures
hampered
side-cluster
fractures,
while
TPSF
can
alleviate
effect
lead
more
uniform
all
Stress
interference
weakens
as
spacing
increases,
patterns
minimally
influenced
once
reaches
40
m.
Higher
rates
improve
pressure,
enlarging
width,
potentially
increasing
risk
penetration.
Barrier
strength
SDC
modify
geometries
determine
penetration
behavior
SPE Journal,
Год журнала:
2025,
Номер
unknown, С. 1 - 11
Опубликована: Янв. 1, 2025
Summary
Preformed
particle
gels
(PPGs)
have
been
broadly
used
in
temporary
plugging
steering
fracturing
techniques.
However,
it
is
difficult
to
achieve
both
excellent
mechanical
and
degradable
properties
conventional
PPGs.
To
address
this
issue,
double
crosslinked
self-degradable
preformed
particulate
(DCSPPGs)
were
prepared
using
starch,
hydroxyethyl
acrylate,
acrylamide,
with
poly
(ethylene
glycol)
diacrylate
(PEGDA)
borax.
The
structure
was
characterized
Fourier
transform
infrared
spectroscopy
(FTIR),
X-ray
diffraction
(XRD),
scanning
electron
microscopy
(SEM),
confirming
the
successful
preparation
of
DCSPPGs.
DCSPPGs
indicate
that
elastic
modulus
reached
22
918
Pa,
which
much
higher
than
most
similar
gels.
Meanwhile,
can
be
degraded
a
low-viscosity
liquid
within
36
hours
without
any
visible
solid
residues.
It
shows
degradation
properties.
In
addition,
study
systematically
evaluated
effects
size,
temperature,
monovalent
(Na+)
vs.
divalent
(Mg2+
Ca2+)
ions
on
swelling
These
findings
reveal
maintain
exceptional
performance
high-temperature
(150°C)
high-salinity
(30%
NaCl)
environments.
Core
displacement
experiments
showed
maximum
breakthrough
pressure
core
after
sealing
could
reach
27.69
MPa
permeability
injury
rate
only
3.55%.
minimal
formation
damage
post-degradation.
To
expand
the
applicability
of
gel
fracturing
fluids
in
ultra-high-temperature
reservoirs,
a
temperature-resistant
polymer
was
synthesized
using
solution
polymerization
method.
Subsequently,
an
ultra-high-temperature-resistant
formulated
by
incorporating
organic
zirconium
crosslinking
agent.
A
comprehensive
investigation
carried
out
to
systematically
study
and
evaluate
steady
shear
property,
dynamic
viscoelasticity,
temperature
resistance
performance,
as
well
core
damage
characteristics
gel.
The
obtained
results
demonstrate
that
viscosity
remained
at
147
mPa·s
200
°C
with
rate
170
s-1.
Compared
significant
30.9%
average
observed
guanidine
gum
fluid,
attributed
substantially
mitigated,
measuring
only
16.6%.
Finally,
gelation
mechanism
scrutinized
conjunction
microscopic
morphology
analysis.
We
expect
this
will
not
contribute
effective
development
deep
ultradeep
oil
gas
reservoirs
but
also
furnish
theoretical
foundation
for
practical
field
applications.
SPE Journal,
Год журнала:
2023,
Номер
28(05), С. 2514 - 2533
Опубликована: Май 8, 2023
Summary
The
uneven
propagation
of
multifractures
is
a
key
factor
restricting
production
growth
due
to
stress
shadow
and
heterogeneity.
To
date,
limited-entry
fracturing
techniques,
nonuniform
perforation,
in-stage
diversion
have
been
commonly
used
promote
even
multifracture
growth.
In
this
study,
fully
coupled
multiple
pseudo-3D
(P3D)
fracture
simulator
has
developed
examine
the
competitive
during
multicluster
in
horizontal
well.
present
model
considers
interaction
among
fractures,
perforation
erosion,
fluid
distribution
clusters,
diversion.
results
are
validated
against
reference
data.
Using
model,
series
numerical
simulations
performed
investigate
with
fracturing.
We
estimate
value
for
different
fractures
time
based
on
approximate
solution
Perkins-Kern-Nordgren
(PKN)
viscosity-dominated
regime
improve
dimensionless
parameter
that
characterizes
competition
between
friction.
distributes
evenly
when
less
than
unity
(perforation
friction
larger
interference).
Based
parameter,
method
design
proposed.
Results
show
case
homogeneous
stress,
parameters
should
be
selected
under
condition
unity.
heterogeneous
conditions,
holes
high-stress
cluster
increased,
making
reduction
equal
heterogeneity
can
balanced
by
decreasing
clusters.
way,
conditions
designed
quantitatively
without
simulation.
For
treatment,
number
ball
sealers
proposed
only
several
or
zero
groups
simulation
necessary
find
optimal
sealers.
A
shows
reliable
achieves
satisfactory
result
an
actual
field
case.
helpful
Processes,
Год журнала:
2025,
Номер
13(3), С. 692 - 692
Опубликована: Фев. 28, 2025
The
dense
cutting
fracturing
mode
has
great
potential
in
the
exploitation
of
unconventional
oil
and
gas
reservoirs,
but
it
faces
problem
severe
uneven
crack
propagation.
Ball-sealer
temporary
plugging
(BTPF)
is
capable
effectively
facilitating
uniform
growth
multi-cluster
fractures.
In
this
research,
a
fracture
propagation
model
for
BTPF
was
established.
Then,
impact
ball-sealer
efficiency,
timing,
number
combinations,
diversions,
perforation
on
hydraulic
fractures
after
were
simulated.
results
indicate
that
efficiency
significant
sealing
optimization
timing
combination
ball
sealers
revealed
deploying
56.25%
total
at
2/3
time
higher
degree
pattern
throwing
more
balls
first
fewer
second
superior
to
other
two-step
patterns.
combined
application
limited
entry
process
conducive
uniformity
consistently
than
achieved
with
limited-entry
fracturing.
This
study
provides
valuable
guidance
reasonable
design
ball-seal
schemes.
