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S_T = S_G + \frac{A_w}{A_{wrc}} \cdot S_M |
where
| Geometrical skin, related to deviation of the well-reservoir contact from the simplest model | ||||
| Mechanical skin, related to pressure drop caused by the near-reservoir zone formation damage | ||||
| borehole flow area | ||||
| well-reservoir contact area |
Based on definition the wellbore pressure dynamics
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p_{wf}(t) = - \frac{q_t}{2 \pi \sigma} \, S + p_{\rm ref}(t,r_w) |
where
| total sandface rate | ||||||||
| formation transmissibility outside the damaged reservoir zone
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| a reference model of a full-entry vertical well with homogeneous reservoir and non-damaged near-reservoir zone |
See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing
[ Well & Reservoir Surveillance ]
[ Skin-factor (geometrical) ][ Skin-factor (mechanical) ]