Page 28 - Formulas and Calculations for Petroleum Engineering

Reservoir engineering formulas and calculations Chapter 1 21

Output(s)

E g : Gas Expansion Factor (SCF/bbl)

Formula(s)

1
E ¼ E G
g gi p
43560 A h Ø 1 S Þ
ð
wi
Reference: Ahmed, T., McKinney, P.D.2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 202.

1.45 Gas expansion term in gas reservoirs
Input(s)
3
B g : Gas Formation Volume Factor (ft /SCF)
3
B gi : Initial Gas Formation Volume Factor (ft /SCF)

Output(s)
3
E g : Gas Expansion Term (ft /SCF)
Formula(s)

E ¼ B B gi
g
g
Reference: Ahmed, T., McKinney, P.D.2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 209.

1.46 Gas flow rate into the wellbore

Input(s)

k: Permeability (mD)
∂P: Pressure Differential (psi)
L: Length of Section Open to Wellbore (ft)
u: Viscosity of intruding Gas (cP)
R e : Radius of Drainage (ft)
R w : Radius of Wellbore (ft)

Output(s)

Q: Flow Rate (bbl/min)

Formula(s)
0:007 k ∂PÞ L
ð
Q ¼
R e
u ln 1440
R
w
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 136.