Page 75 - Formulas and Calculations for Petroleum Engineering

68 Formulas and calculations for petroleum engineering

1.156 Water-drive recovery

Input(s)
Ø: Porosity (fraction)
S w : Water Saturation (fraction)
B oi : FVF at Initial Conditions of Reservoir (RB/STB)
k: Permeability (D)
m wi : Water Viscosity (cP)
m oi : Oil Viscocity (cP)
P i : Initial Pressure (psi)
P a : Pressure at Depletion (psi)

Output(s)

E R : Fractional Recovery Efficiency (fraction)

Formula(s)

0:0422 0:0770 0:2159
Ø 1 S Þ k m wi 0:1903 P i
ð
w
E ¼ 54:898 S ð Þ
R w
B P
oi m oi a
Reference: Craig Jr. F. F., 2004, The Reservoir Engineering Aspects of Waterflooding, Vol. 3. Richardson, Texas: Mono-
graph Series, SPE, Page: 83.
1.157 Water expansion term in gas reservoirs

Input(s)
3
B g : Initial Gas Formation Factor (MSCF/ft )
c w : Water Compressibility (1/psi)
s w : Initial Water Saturation (fraction)
c f : Formation Compressibility (1/psi)
P: Pressure Differential (psi)

Output(s)

E f : Expansion Term (fraction)

Formula(s)

B c s c P
g w w f
E ¼
f
1 s
w
Reference: Ahmed, T. & McKinney, P. Advanced Reservoir Engineering, Gulf Publishing House, Burlington, MA, 2015.

1.158 Water formation volume factor—McCain correlation

Input(s)
T: Temperature (F)
p: Pressure (psi)