|
A
|
=
|
pattern area , acres
|
|
Bo |
= |
oil formation volume factor , volume @ reservoir conditions divided by volume @ standard conditions, dimensionless |
|
Bw |
= |
water formation volume factor, volume @ reservoir conditions divided by volume @
standard conditions |
|
C |
= |
constant |
|
d |
= |
distance between adjacent rows of wells |
|
Ea |
= |
model areal sweep efficiency, area swept divided by total pattern area , fraction |
|
Ed |
= |
microscopic oil displacement efficiency , volume of oil displaced divided by total volume of oil , fraction |
|
Ev |
= |
volumetric sweep efficiency , fraction of total reservoir volume contacted by the injected fluid |
|
fo |
= |
fraction of total flowing stream composed of oil |
|
fw |
= |
fraction of total flowing stream composed of water |
|
hnet |
= |
formation thickness , ft |
|
ibase |
= |
injection rate of fluid having the same mobility as reservoir oil |
|
iw |
= |
water injection rate , BPD |
|
k |
= |
absolute permeability , md |
|
ko |
= |
effective permeability to oil , md |
|
kro |
= |
relative permeability to oil , fraction |
|
krw |
|
relative permeability to water, fraction |
|
kw |
= |
effective permeability to water , md |
|
kwko |
= |
water - oil permeability ratio, dimensionless |
|
Ln |
= |
natural logarithm , base
|
|
M |
= |
mobility ratio, mobility of the displacing fluid divided by the mobility of oil, dimensionless
|
|
Nwf |
= |
initial oil in place, bbl |
|
Np |
= |
cumulative produced oil volume , bbl
|
|
DNp |
= |
incremental oil produced , bbl |
|
p |
= |
pressure, psi
|
|
D
p
|
= |
pressure difference, between the formation face injection pressure and the
pressure of the leading edge of the oil bank in the reservoir, psig |
|
pb |
= |
bubble point or saturation pressure, psi |
|
pe |
= |
pressure at external boundary, psi |
|
pi |
= |
initial pressure, psi |
|
piwf |
= |
injection well bottom hole pressure , psi |
|
po |
= |
pressure in oil phase, atm |
|
pw |
= |
pressure in water phase, atm or bottom hole pressure, psi |
|
pc |
= |
capillary pressure, atm ( equal to po - pw ) |
|
q |
= |
production rate, BPD |
|
qo |
= |
oil production rate, BOPD |
|
qw |
= |
water production rate, BWPD |
|
Qi |
= |
pore volumes of cumulative injected fluid |
|
r |
= |
radial distance, ft, water bank, prior to interference |
|
re |
= |
external boundary radius, ft, oil bank, prior to interference |
|
rw |
= |
well radius , ft |
|
Rs |
= |
solution GOR, scf/bbl |
|
Sg |
= |
gas saturation , fraction of pore volume |
|
Sg* |
= |
gas saturation, in pilot flooding, equal to C * (Soi-Sobt) from fig E.7 |
|
Sgi |
= |
initial gas saturation , fraction of pore volume |
|
So |
= |
oil saturation, fraction of pore volume |
|
Soi |
= |
initial oil saturation , fraction of pore volume |
|
Sor |
= |
residual oil saturation, fraction of pore volume
|
|
Sw |
= |
water saturation, fraction of pore volume |
|
Sw
|
= |
average water saturation, fraction of pore volume |
|
Swi |
= |
initial water saturation, fraction of pore volume |
|
Swc |
= |
connate water saturation, fraction of pore volume |
|
dfw/dsw |
= |
slope of the fractional flow curve |
|
t |
= |
time , days |
|
Vd |
= |
displaceable volume , equal to the cumulative injected fluid as a fraction
of the product of the pattern pore volume and the displacement efficiency
of the flood
|
|
Vp |
= |
pore volume , bbl
|
|
W |
= |
water volume, bbl |
|
Wi |
= |
cumulative injected water volume, bbl |
|
DWi |
= |
incremental injected water volume , bbl |
|
DWp
|
= |
incremental produced water volume , bbl |
|
Wor |
= |
Water to oil ratio |
|
g |
= |
conductance ratio, ratio of injectivity of water at any pattern areal sweep to that of reservoir oil
|
|
l |
= |
mobility, ( k / m )
|
|
lg |
= |
gas mobility , ( kg /
mg) |
|
lo |
= |
oil mobility , ( ko /
mo) |
|
lw |
= |
water mobility , ( kw /
mw) |
|
m |
= |
viscosity , cp |
|
mg |
= |
gas
viscosity , cp |
|
mo |
= |
oil viscosity , cp |
|
mw |
= |
water viscosity ,
cp |
|
f |
= |
porosity , fraction |