Page 505 - Enhanced Oil Recovery in Shale and Tight Reservoirs

Nomenclature

a empirical constant for Langmuir-type isotherm
n
1
n 2nþ1
A preexponential or frequency factor, t ,s 1 in Eq. 13.2, or L t /m ,
1
-n
d ∙kPa in Eq. 13.12, or area, L 2
3
3
A(c o ) chemical reaction rate per unit volume, m/L t, mol/(m ∙s)
A f fracture surface area, L 2
A o rock area covered by oil, L 2
A w rock area covered by water, L 2
b empirical constant for Langmuir-type isotherm
c a constant, the ratio of the gravity force to the capillary force in Eq. 10.13
dimensionless, or a ratio of two parameters
o
2
2
C heat capacity, L /t T, kJ/(kg∙ C), or J/(kg∙K), or a conversion constant in
Eq. 9.45
3
C A precipitated asphaltene concentration in the liquid phase, m/L , meq/mL
C H empirical constant in Huh’s equation
2 2
C pc capillary parameter, m/L t , psi(Darcy) 1/2
3
3
C surf surfactant concentration, L /L , vol.%
3
3
b C surf adsorbed surfactant concentration, L /L , vol.%
2
c t total compressibility, Lt /m, psi 1
CT CT number measured in a substance
CT a CT number for air
CT ar CT number for a dry rock saturated with air
CT g CT number for gas
CT gor CT number for a system of gas, oil, and rock
CT gr CT number for a dry rock saturated with gas
CT o CT number for oil
CT or CT number for a dry rock saturated with oil
CT r CT number for a rock
D pore diameter or penetration depth (Chapter 2), L, ft, or diffusion coefficient,
2
2
L /t, cm /s (Chapter 10)
D pt average pore throat diameter, L
D ptc critical pore throat diameter, L
3
E A fractional pore volume occupied by asphaltene deposition, L ,m 3
2
2
E activation energy of the decomposition or oxidation reaction, L /t , kJ/mol,
J/mol
E pc exponent of a capillary pressure function, dimensionless
F c capillary force, mL/t 2
F v viscous force, mL/t 2
2
g gravitational constant, Lt , m/s 2
G magnetic gradient
h height, L
2
2
H enthalpy yet to be released, equals to (H o H t ), mL /t ,J
2
2
H o total released heat, mL /t ,J
469 j