Page 251 - Formulas and Calculations for Petroleum Engineering

244 Formulas and calculations for petroleum engineering

h d : Dimensionless Effective Thickness (dimensionless)
s th : Directional Drilling Skin Factor (dimensionless)
s t : Skin Factor other than Directional Drilling (dimensionless)

Formula(s)

0:5 ! !
kv 180
π
tw ¼ atan tan θ
kh 180 pi
0:5

h kh
h ¼
d
rw kv
tw tw h d
2:06 1:865
s ¼ log
th
41 56 100
s ¼ s s
t th
Reference: Pressure Transient Testing, Lee, Rollins & Spivey, Page: 44.
4.88 Slope of Semilog plot for bottom-hole flowing pressure vs time for drawdown test

Input(s)
Q o : Oil Flow Rate (STB/day)
μ o : Oil Viscosity (cP)
B o : Oil Formation Volume Factor (bbl/STB)
k: Permeability (mD)
h: Thickness (ft)

Output(s)

m: Slope (psi/cycle)

Formula(s)

162:6 Q μ B o
o
o
m ¼
k h
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1,
Page: 45.

4.89 Sucker rod—Peak polished rod load
Input(s)

C: Calibration Constant of Dynamometer (lb/in.)
D: Maximum Deflection (in.)

Output(s)

PPRL: Peak Polished Rod Load (lb)