Page 199 - Formulas and Calculations for Petroleum Engineering

192 Formulas and calculations for petroleum engineering

m b : Slope of Pressure vs Fourth Root of Time (Bi-linear Flow Analysis) (psi/h 0.25 )
c t : Total Compressibility (1/psi)
k: Permeability (mD)
h: Reservoir Thickness (ft)

Output(s)
w f . k f : Fracture Conductivity (ft mD)

Formula(s)

2 0:5

44:1 q m B 1
w :k ¼
f f
h m b ø m c k
t
Reference: Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of
Petroleum Engineers, Page: 117.

3.38 Fracture conductivity during bilinear flow
Input(s)

Q: Flow Rate (STB/day)
B: Formation Volume Factor (bbl/STB)
m: Viscosity (cP)
m bf : Slope of Bilinear Flow during Build-up Test (psi/cycle)
h: Thickness (ft)
ø: Porosity (fraction)
c t : Total Compressibility (1/psi)
k: Permeability (mD)

Output(s)
F C : Fracture Conductivity (mD ft)

Formula(s)

! 2
44:1 Q m B
F ¼ 0:25
C
m h ø m c kð Þ
bf t
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1,
Page: 95.

3.39 Inflow performance relationship (IPR) for horizontal wells in solution gas-drive
reservoirs (Fetkovich)

Input(s)
q omax : Maximum Flow Rate for Maximum Drawdown (STB/day)
P wf : Flowing Bottomhole Pressure (psi)
P: Shut in Pressure or Average Reservoir Pressure (psi)
n: Exponent (dimensionless)