Page 509 - Enhanced Oil Recovery in Shale and Tight Reservoirs

Nomenclature 473

.
m viscosity, m/Lt, mPa s, or attenuation coefficient (Chapter 2)
1 1
.
m e effective viscosity of two phases (but considered as one phase), mL t , mPa s
m gr attenuation coefficient for a core fully saturated with gas
m or attenuation coefficient for a core fully saturated with oil
3
r density, m/L , kg/m 3
3
r or density for a rock bulk fully saturated by oil, m/L , kg/m 3
2
s interfacial tension, mt , mN/m, or deposition constant for the snowball effect,
dimensionless (Chapter 3)
p constant ratio of the circumference to its diameter of a circle, or osmotic pressure
2
(Chapter 12), m/Lt , atm.
f porosity, dimensionless, fraction or %
F potential, m/Lt 2
3
3
G s adsorbed surfactant concentration, L /L , vol.%
u mixing parameter, fraction
u kr interpolation scaling factor for k r , dimensionless
u pc interpolation scaling factor for p c , dimensionless
Superscripts
e indicates an end point in a k r equation
high at a high capillary or trapping number
L lower bound
low at a low capillary or trapping number
mw mixed wet
U upper bound
WA wettability alteration only
ww waterewet
ow oilewet

Subscript
0 initial
a air
as airesolid (interface)
b bulk
b1,b2 dummy phase b1, b2
c critical
D dimensionless
f formation
F fracture
FI forced imbibition
fm fracture to matrix
g gas
huff during the huff time
i initial
j dummy phase j
j 0 conjugate phase of phase j
nw nonwetting