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LaTeX Math Inline
bodyr_w

well radius from drilling

LaTeX Math Inline
bodyr_s

damaged reservoir (

LaTeX Math Inline
bodyk_s \neq k
) radius:
LaTeX Math Inline
bodyr_s > r_w
( the most typical range is:
LaTeX Math Inline
bodyr_w < r_s < 1
m )

LaTeX Math Inline
bodyk

absolute formation permeability in the undamaged reservoir zone away from well location

LaTeX Math Inline
bodyk_s

absolute formation permeability in the damaged near-well reservoir zone


The definition definition of 

LaTeX Math Inline
bodyS_M
 in 
LaTeX Math Block Reference
anchorSM
 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
    .

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