In
the
process
of
developing
deep
oil
and
gas
resources,
problem
high
temperature
salinity
in
strata
has
become
a
serious
challenge
faced
by
water-based
drilling
fluids.
Under
conditions,
fluids
must
maintain
good
rheological
properties
to
ensure
safe
efficient
work.
this
study,
temperature-
salt-resistant
viscosifier
(DASL)
was
synthesized
using
N,
N-dimethylacrylamide,
2-Acrylamido-2-methylpropane
sulfonic
acid,
sodium
p-styrene
sulfonate,
lauryl
methacrylate
as
monomers
with
double
backbone
structure
micro
crosslinking
hydrophobic
association
structures.
The
results
pyrene
fluorescence
probe
test
transmission
electron
microscopy
observation
showed
that
DASL
an
obvious
associative
structure.
Moreover,
due
presence
microcrosslinked
structure,
exhibits
shear
thinning
property
thixotropy
aqueous
solution.
conditions
200℃
35
wt%
NaCl,
apparent
viscosity
fluid
2
added
24.5
mPa⸱s,
filtration
only
9.2
mL.
addition,
mechanism
studies
have
shown
dual
skeleton
improves
its
salt
resistance.
can
adsorb
bridge
bentonite
particles,
increase
internal
friction
structural
fluid,
enhance
mesh
improve
colloidal
stability
reasonable
particle
size
distribution
which
enable
significantly
while
reducing
loss
fluid.
This
work
demonstrates
polymers
structures
application
effects
for
SPE Journal,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 13
Published: Oct. 1, 2024
Summary
High-temperature
stability
of
spacer
fluid
is
a
vital
prerequisite
to
ensure
the
safety
cementing
operations
in
deep
or
ultradeep
wells.
Faced
with
this
problem,
thermal
suspension
agent
at
high
temperatures
improved
from
aspects
polymerization
monomer
and
molecular
chain.
A
terpolymer
SAD
was
synthesized
by
free
radical
sodium
styrene
sulfonate
(SSS),
acrylamide
(AM),
N,
N’-diethylacrylamide
(DEAA)
aqueous
solution.
The
name
terpolymer,
SAD,
initial
letter
composition
three
monomers.
Polyethyleneimine
(PEI)
can
improve
chain
structure
transamidation
reaction
amide
group
so
temperature
PSAD
(polyethyleneimine
+
SAD)
obtained
compounding
PEI
SAD.
properties
were
characterized
Fourier
infrared
spectroscopy,
hydrogen
nuclear
magnetic
resonance
(NMR)
gel
permeation
chromatography,
X-ray
photoelectron
spectroscopy
(XPS),
thermogravimetric
analysis,
scanning
electron
microscopy
(SEM),
viscosity
test.
In
addition,
comprehensive
under
action
are
evaluated.
results
showed
that
crosslinking
degree
gradually
increased
increase
temperature.
After
aging
200°C,
decomposition
305°C,
which
show
terrific
stability.
At
same
time,
prepared
not
only
has
excellent
rheological
range
90
~
200°C
but
also
keeps
density
difference
between
upper
lower
parts
slurry
less
than
0.02
g/cm3
filtration
loss
50
mL.
In
the
process
of
developing
deep
oil
and
gas
resources,
problem
high
temperature
salinity
in
strata
has
become
a
serious
challenge
faced
by
water-based
drilling
fluids.
Under
conditions,
fluids
must
maintain
good
rheological
properties
to
ensure
safe
efficient
work.
this
study,
temperature-
salt-resistant
viscosifier
(DASL)
was
synthesized
using
N,
N-dimethylacrylamide,
2-Acrylamido-2-methylpropane
sulfonic
acid,
sodium
p-styrene
sulfonate,
lauryl
methacrylate
as
monomers
with
double
backbone
structure
micro
crosslinking
hydrophobic
association
structures.
The
results
pyrene
fluorescence
probe
test
transmission
electron
microscopy
observation
showed
that
DASL
an
obvious
associative
structure.
Moreover,
due
presence
microcrosslinked
structure,
exhibits
shear
thinning
property
thixotropy
aqueous
solution.
conditions
200℃
35
wt%
NaCl,
apparent
viscosity
fluid
2
added
24.5
mPa⸱s,
filtration
only
9.2
mL.
addition,
mechanism
studies
have
shown
dual
skeleton
improves
its
salt
resistance.
can
adsorb
bridge
bentonite
particles,
increase
internal
friction
structural
fluid,
enhance
mesh
improve
colloidal
stability
reasonable
particle
size
distribution
which
enable
significantly
while
reducing
loss
fluid.
This
work
demonstrates
polymers
structures
application
effects
for
