Pore-Scale Investigation of Wetting Strength on Capillary Pressure Hysteresis in A Realistic Porous Media Using Lattice Boltzmann Method
Pore-Scale Investigation of Wetting Strength on Capillary Pressure Hysteresis in A Realistic Porous Media Using Lattice Boltzmann Method oRpqB
Capillary pressure hysteresis is considered a realistic porous media characteristic, which strongly affects the fluid flow displacement. Therefore, after benchmark tests, the basic concepts of drainage and imbibition processes and how to determine the capillary pressure-saturation curve by the Lattice Boltzmann Method are discussed. Studies have been done in three categories of wettability conditions, including nearly neutral wet, moderately wet, and strongly wet. The interesting point is the capillary pressure bump phenomenon in the drainage process because this model can capture that. Since the capillary pressure plays a resistive-role for fluid displacement in the drainage process, wettability change controls the flow pattern intensely. Furthermore, results show that increasing the wetting strength will intensify this phenomenon despite the shift of both imbibition and drainage curves towards higher capillary pressures. Hence, the cause of this event can be the excessive increase of capillary pressure in some pores. Another implication is that increasing the wettability strength will allow more wetting fluid to be trapped in the drainage process, which is a sign of the snap-off phenomenon.
Capillary
pressure
hysteresis
is considered
a realistic porous media characteristic, which
strongly
affects the fluid flow displacement.
Therefore
, after benchmark
tests
, the basic concepts of
drainage
and
imbibition
processes
and how to determine the
capillary
pressure-saturation curve by the Lattice Boltzmann Method
are discussed
. Studies have
been done
in three categories of
wettability
conditions, including
nearly
neutral wet,
moderately
wet, and
strongly
wet. The interesting point is the
capillary
pressure
bump phenomenon in the
drainage
process
because
this model can capture that. Since the
capillary
pressure
plays a resistive-role for fluid displacement in the
drainage
process
,
wettability
change
controls the flow pattern
intensely
.
Furthermore
, results
show
that increasing the wetting strength will intensify this phenomenon despite the shift of both
imbibition
and
drainage
curves towards higher
capillary
pressures
.
Hence
, the cause of this
event
can be the excessive increase of
capillary
pressure
in
some
pores. Another implication is that increasing the
wettability
strength will
allow
more wetting fluid to
be trapped
in the
drainage
process
, which is a
sign
of the snap-off phenomenon.