Page 388 - Petrophysics 2E

356 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

NOMENCLATURE

A area
As area of the surface of rocks or sands
CP viscosity (centipoise)
D day; darcy
dave average pore diameter
F free energy
FWL free water level (in reference to capillary rise of fluids)
g gravitational constant; 980 cm/s2; 32.2 ft/s2
HO length measured from the oil level to the bottom of the sample
in the drainage measurement, cm
h height of capillary rise
J dimensionless function for correlation of capillary pressure to
permeability and porosity
k absolute permeability(pm*, darcy)
Kz Carman-Kozeny Constant
1; length (m, cm, ft)
m meter
N centrifuge revolutions per minute; newton
n, capillary number
0 oil (used as subscript)
OWC oil-water contact
P pressure (Pa, atm, psi)
pc capillary pressure (Pa, psi)
@c)D displacement capillary pressure at the effluent end of
a core in a centrifuge
capillary pressure at the inlet of the core (centrifugal
@C>i
measurement of capillary pressure)
Pct threshold capillary pressure
Pnw pressure of a non-wetting fluid
Pw pressure of a wetting fluid (generally taken as the water phase)
Po pressure of the oil phase
r radius of curnature of an arc of an interface (cm)
rg radius of a grain
rsi radius of a spherical interface
rW water resistivity
r radius
rC radius of a capillary tube
fH mean hydraulic radius
ri radius of a spherical interface
r0 radius of the centrifuge rotary axis measured to the oil level
rW radius of the centrifuge rotary axis measured to the water level