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with the meaning that near-reservoir damage is resulting in additional pressure drop quantified by the value of mechanical skin of mechanical skin-factor
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It quantitatively characterises permeability change in a thin layer (usually < 1 m) around the well or around the fracture plane, caused by stimulation or deterioration during the reservoir invasion under drilling or well intervention or under routine production or injection.
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The most popular practical range of skin-factor variation is
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For the negative skin-factor values there is a natural limitation from below caused by the Mechanical Skin concept itself.
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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
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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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