Page 243 - Formulas and Calculations for Petroleum Engineering

236 Formulas and calculations for petroleum engineering

h
h ¼ C b 1 bð Þ d
wd d C
2:71
1
1 b
s ¼ ln h
p f wdg
b
Reference: Horizontal Well Technology, Joshi, Page: 496.

4.72 Pseudo-skin factor due to partial penetration (Odeh correlation)

Input(s)
h 1 : Distance from payzone top to top of open interval (ft)
h p : Perforation interval (ft)
h: Total pay thickness (ft)
r w : Wellbore Dia (ft)
k v : Horizontal Permeability (mD)
k h : Vertical Permeability (mD)

Output(s)

z m : Well Perforation Distance (ft)
h d : Dimensionless Payzone Thickness (dimensionless)
b: Penetration Ratio (dimensionless)
r wc : Effective Wellbore dia (ft)
s p : Skin due to partial penetration (dimensionless)

Formula(s)

h
p
z ¼
m
h

h k h
h ¼ sqrt
d
r k
w v
h p
b ¼ h +
1
2

z m
0:2126 2:753 +
r ¼ r 2:71 h
wc w

1 0:825
s ¼ 1:35 1 ln r h +7ð Þ 1:95 ln r 0:49 + 0:1 ln r h Þð ð Þ
p w d f wcg w d
b
Reference: Horizontal Well Technology, Joshi, Page: 495.
4.73 Pseudo-skin factor due to partial penetration (Papatzacos correlation)
Input(s)
h p : Perforation interval (ft)
h: Total pay thickness (ft)
h 1 : Distance from top of reservoir to top of
open interval (ft)