GLOSSARY

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The most popular practical range of skin-factor variation is 

LaTeX Math Inline
body-5 < S_M < 8
 with upper limit going arbitrarily highmay sometimes extend further up.

For the negative skin-factor values there is a natural limitation from below caused by the Mechanical Skin concept itself.

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LaTeX Math Block
anchorks
alignmentleft
k_s = k \cdot \left[ 1+\frac{S_M}{ \ln \frac{r_s}{r_w}} \right]^{-1} \rightarrow \infty \, \mbox{  when  } S_M \rightarrow -5


In other words, the highly negative skin-factor 

LaTeX Math Inline
bodyS_M < -5
 should be modelled as composite area around near-reservoir zones rather than using the concept of Mechanical Skin.


For horizontal wells the lower practical limit when Mechanical Skin concept can be applied is even lower and usually assumed as 0.

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