Skin Effects in Petroleum Engineering

Skin Effects

Outline
• Hawkins’ Formula
• Skin Components

w
s
idealwfs r
r
kh
q
pp ln
2
,
π
μ
=−
w
s
s
realwfs r
r
hk
q
pp ln
2
,
π
μ
=−

Hawkins’ Formula
w
s
w
s
s
realwfidealwf r
r
kh
q
r
r
hk
q
ppp ln
2
ln
2
,,
π
μ
π
μ
−=−=Δ
w
s
sr
r
kkh
qln 11
2⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−=
π
μ
w
s
sr
r
k
k
kh
qln1
2⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−=
π
μ
S
kh
q
π
μ
2
=
w
s
sr
r
k
k
Sln1⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−=