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The definition 

LaTeX Math Block Reference
anchorSM
page1DR pressure diffusion of low-compressibility fluid
suggests that:
 

  • deteriorated near-well reservoir zone 
    LaTeX Math Inline
    bodyk_s < k
     is characterized by a positive skin-factor 
    LaTeX Math Inline
    bodyS>0
    ,
     
  • improved near-well reservoir zone  
    LaTeX Math Inline
    bodyk_s > k
     is characterized by a negative skin-factor 
    LaTeX Math Inline
    bodyS<0
    .

...

The most popular practical range of skin-factor variation is 

LaTeX Math Inline
body-5 < S < 8
.


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 Formula 

LaTeX Math Block Reference
anchorpwf
page1DR pressure diffusion of low-compressibility fluid
 provides a good example how mechanical skin-factor affects pressure dynamics.