SFpdc

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INFFINDER

Oil & Gas industry
Engineering

Skin factor (pressure drop curve)

Metric units

×

⎡
⎢
⎣

−

−
Log

⎡
⎢
⎣

%

×

×

×

⎤
⎥
⎦

+

⎤
⎥
⎦

=

SF

C1
Constant #1

Pi
Initial reservoir pressure, psi

P1hr
Pressure value at the intersection of the middle
segment of a straight line with the ordinate axis, psi

m
Tilt angle of the middle segment line, psi / cycle

k
Permeability, millidarsy

φ
Rock porosity, %

µ
Liquid viscosity, centipoise

Ct
Total compressibility, psi⁻¹

Rw²
Wellbore radius, inch (the formula converts inches to feet)

C2
Constant #2