GLOSSARY

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Effect when a formation permeability 

LaTeX Math Inline
bodyk_s
 in certain near-well reservoir zone is different to that of initial before drilling/treatments
LaTeX Math Inline
bodyk
: 
LaTeX Math Inline
bodyk_s \neq k

The usual extension of formation damage is  is around few centimetres but may extend to few dozens of centimetres. 

In many flow models this zone is considered as thin sandface film between wellbore and rocks and quantified by integral value of mechanical skin-factor.