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The most popular practical range of skin-factor variation is 

LaTeX Math Inline
body-5 < S < 8
.


LaTeX Math Block
anchor3BV5C
alignmentleft
k_s = \frac{k}{ 1 + \frac{S_M}{ \ln \frac{r_s}{r_w}  }}


See Also

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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing

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