Inflow Performance Relationship

  • Sylvester Okotie
  • Bibobra Ikporo


Whenever a well is drilled and completed, it is expected to flow naturally via the wellbore to the surface, a relationship known as inflow and outflow. The inflow performance relationship (IPR) is often required for estimating well capacity, designing well completion, designing tubing string, optimizing well production, performing nodal analysis calculations, and designing artificial lift etc. This performance is commonly defined in terms of a plot of surface production rate versus bottomhole flowing pressure on a cartesian coordinate. The maximum flow rate that occurs when the bottomhole flowing pressure is zero and the maximum rate corresponding to this pressure is called the absolute open flow (AOF). In this chapter, several mathematical models for estimating the inflow performance relationship (IPR) are presented with solved example questions. Also, a case study of an improvement in IPR curve of well K35 to evaluate the efficacy of a pre and post stimulation job is also presented. Result indicates that; it is very important to determine the type of skin on each well. This help in knowing the type of solution to the problem of a well in order to increase its productivity. Thus, a well whose skin is due to completion, partial penetration or slanting of well does not require stimulation and if the field’s operators go ahead to stimulate, they will only end up wasting time and money without achieving any result because these types of skin cannot be removed by stimulation.


Well stimulation Fetkovich Productivity index Skin Inflow performance relationship Absolute open flow Oil rate Formation damage Bubble point pressure Vogel Bottomhole flowing pressure Saturated reservoir Undersaturated reservoir Flow test data 


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Sylvester Okotie
    • 1
  • Bibobra Ikporo
    • 2
  1. 1.Department of Petroleum EngineeringFederal University of Petroleum ResourcesEffurunNigeria
  2. 2.Department of Chemical & Petroleum EngineeringNiger Delta UniversityYenagoaNigeria

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