Page 43 - Formulas and Calculations for Petroleum Engineering

36 Formulas and calculations for petroleum engineering

Output(s)

V g : Gas Velocity (cc)

Formula(s)
k P 2
V ¼
g
2 m
Reference: Ahmed, T. & McKinney, P.D. Advanced Reservoir Engineering, Gulf Publishing House, Burlington, MA, 2015.

1.81 Klinkenberg gas effect

Input(s)
k l : Permeability of liquid (mD)
p: Mean flowing pressure of the gas (atm)
b: Klinkenberg factor, fixed for a gas (constant)

Output(s)
k g : Apparent permeability of gas (mD)

Formula(s)

b
k ¼ k 1+
g l
p
Reference: Wikipedia.org.

1.82 Kozeny equation

Input(s)
Ø: Porosity (fraction)
k z : Kozeny Constant (dimensionless)
1
S p : Specific Surface Area (cm )
Output(s)

2
k: Permeability (cm )
Formula(s)
Ø
k ¼ 2
k S p
z

Reference: Dandekar, A. Y. 2006. Petroleum Reservoir Rock and Fluid Properties. Boca Raton, FL: CRC Press Taylor &
Francis Group, Page: 52.

1.83 Kozeny-Carman relationship
Input(s)

B: Geometric factor (dimensionless)
Ø: Porosity (fraction)
d: Diameter of Particle (cm)
τ: Tortuosity (dimensionless)