Page 41 - Formulas and Calculations for Petroleum Engineering

34 Formulas and calculations for petroleum engineering

1.75 Interporosity flow coefficient

Input(s)
2
A: Surface Area of the Matrix Block (ft )
3
V: Volume of the Matrix Block (ft )
x: Characteristic Length of the Matrix Block (ft)
k m : Permeability of Matrix (mD)
k f : Permeability of Fracture (mD)
r w : Wellbore Radius (ft)

Output(s)
2
a: Block-Shape Parameter (1/ft )
l: Interporosity Flow Coefficient (dimensionless)

Formula(s)

A
a ¼
V x
2

a k r w
m
l ¼
k
f
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1,
Page: 82.
1.76 Interstitial velocity

Input(s)
3
q: Flow Rate (cm /s)
Ø: Porosity (fraction)
2
A: Area (cm )

Output(s)
V: Interstitial Velocity (cm/s)

Formula(s)

q
V ¼
Ø A

Reference: Civan, F. Reservoir Formation Damage: Fundamentals, Modeling, Assessment, and Mitigation. Gulf Pub-
lishing Company, Houston, Texas, Page: 493.

1.77 Isothermal compressibility of oil—Vasquez-Beggs correlation—P > Pb

Input(s)
p: Pressure (psi)
T: Temp (F)
g g : Specific Gravity of Gas (fraction)
R sob : Solution oil gas ratio at bubble point (fraction)
r: Density of oil (API)