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It's again important to avoid confusion between the termine termines stationary conditions (which mean that refered properties are not chaning in time) and stabilised flow conditions which may admit pressure and rate vraition.

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IPR – Inflow Performance Relationship

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IPR – Inflow Performance Relation represnts the relation between the bottom-hole pressure ИКСИндикаторная кривая скважины (в англоязычной литературе IPR = Inflow Performance Relationship) представляет собой связь между забойным давлением 

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bodyp_{wf}
и дебитом (или расходом) скважины на поверхности   and surface flow rate  
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bodyq
  в процессе стационарной эксплуатации during the stabilised flow:

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p_{wf} = p_{wf}(q)

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