Page 46 - Formulas and Calculations for Petroleum Engineering

Reservoir engineering formulas and calculations Chapter 1 39

1.88 Maximum height of oil column in cap rock

Input(s)
P a : Total Potential energy of accumulation (psi)
P w : Water Potential in Reservoir (psi)
2
G o : Initial oil pressure gradient in Reservoir rock (cm )
a: Height Constant (dimensionless)
h: Depth (ft)
P c : Capillary Pressure (psi)
r: Density differential between fluids (ppg)

Output(s)

H: Maximum Height of Oil Column (ft)

Formula(s)

P P + G h a + P c
o
w
a
H ¼
r G o
Reference: Tarek Ahmed, Paul McKinney, Advanced Reservoir Engineering, Gulf Publishing House, Burlington, MA,
2015.

1.89 Modified Cole plot

Input(s)
G: Gas in Place (SCF)
W e : Cumulative Water Influx (bbl)
E t : Total Expansion Term (bbl/SCF)

Output(s)
F
: Fluid Withdrawal (bbl)
E t
Formula(s)

F W e
¼ G+
E E
t t
Reference: Ahmed, T., McKinney P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 212.

1.90 Modified Kozeny-Carman relationship

Input(s)
Ø: Porosity (fraction)
Øc: Percolation Porosity (fraction)
B: Geometric Factor (fraction)
d: Average Grain Diameter (m)