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For undersaturated oil reservoir

LaTeX Math Inline
bodyp_R > p_b
 the behavior of WFP – Well Flow Performance model will depend vary on whether the bottom-hole pressure is above or below bubble point.

When it is higher than bubble point

LaTeX Math Inline
bodyp_{wf} > p_b
 then formation flow will be single-phase oil and production will follow the constant WFP – Well Flow Performance. 

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It can be interpreted as deterioration of near-reservoir zone permeability when the fluid velocity is high and modelled as approximated by rate-dependant skin-factor.


Fig. 3. WFP – Well Flow Performance for 2-phase oil+gas production below and above bubble point

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