lesson 5 Flashcards
the basic concepts of multiphase flow
interfacial tension
wettability
contact angle
On all interfaces between solids
and fluids, and between immiscible
fluids, there is a surface free energy
resulting from______
electrical forces.
refers to
the tension between liquids at a
liquid/liquid interface
Interfacial tension
is energy per
unit of surface area, or force per unit
length.
Interfacial tension
-The value of IFT depends
on the
composition of the two fluids at the
interface between phases.
are imperical parameters.
Parachor
component i can be
estimated using the molecular weight
Mi of component i and the empirical
regression equation.
parachor
is the ability of a fluid
phase to preferentially wet a solid
surface in the presence of a second
immiscible phase.
-Wettability
-Wettability is measured by
Contact Angle
is always
measured through the more dense
phase.
Contact angle
is the pressure
difference across the curved interface
formed by two immiscible fluids in a
small capillary tube.
-Capillary pressure
provides an estimate of the height of the transition zone between immiscible phases.
equivalent height
is the nonwetting phase in a
water-wet reservoir.
oil
is inversely proportional to the difference in
densities between two immiscible phases.
Equivalent height
in _____systems, gas usually
behaves as the nonwetting phase and
oil is the wetting phase
gas-oil
is defined as
the ratio of effective phase
permeability to phase viscosity.
Fluid phase mobility
A measure of the ability of a fluid to
move through interconnected pore
space
Mobility
is defined as the mobility of the displacing fluid behind the front divided by the mobility of the displaced fluid ahead of the front
Mobility Ratio
is the ratio of water production rate to total production rate.
-The fractional flow of water
is obtained by replacing flow
rates with Darcy’s Law in the
definition of fractional flow.
-A simplified fractional flow
equation
the two-phase
flow of oil and water in a tilted linear
system.
Fractional Flow Equation with
Gravity
it is the pressure at the
gas oil contact.
saturated reservoir,
Factors that affect repressurization:
amount of the pressure
amount of free gas available to be
dissolved
is a necessity to avoid large amounts of pressure
iterations and/ or timestep reductions.
Smoothness
