Page 205 - Formulas and Calculations for Petroleum Engineering

198 Formulas and calculations for petroleum engineering

Formula(s)

! ! 1
2
ð 1 øÞ ø
Dt ¼ +
Dt Dt
ma f
Reference: Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4.
Chapter 3, Page: 56.

3.50 Reservoir permeability
Input(s)

q o : Oil Flow Rate (bbl/d)
B o : Oil Formation Volume Factor (bbl/STB)
m o : Oil Viscosity (cP)
m: Slope of Horner Plot (psi/cycle)
h: Pay zone of Thickness (ft)

Output(s)
k o : Reservoir Permeability (mD)

Formula(s)

m o
k ¼ 162:6 qðÞ B Þ
ð
o
o
o
m h
Notes: Permeability Evaluated from Horner Plot (Semi-Log Plot).
Reference: Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of
Petroleum Engineers, Page: 104.
3.51 Shut-in time for pressure build-up test (Dietz method)

Input(s)
ø: Porosity (fraction)
2
A: Drainage Area (ft )
C A : Shape Factor (dimensionless)
m: Viscosity (cP)
c t : Total Compressibility (1/psi)
k: Permeability (mD)

Output(s)
t s : Shut-in Time (h)

Formula(s)

ø m c A
t
t ¼
s
0:0002637 C k
A
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1,
Page: 63.