Inflow Performance Relationship

Inflow Performance RelationshipBy P.E. Eduardo Khoji Endo HernndezContentsIPR IntroductionProductivity Index (J)Basic IPR Equations (Vogel)IPR for Damaged Wells (Standing)

2Inflow performance relationshipIntroductionInflow Performance Relationship (IPR) of a well is the relation between the production rate and flowing bottom hole pressure. For oil wells, it is frequently assumed that fluid inflow rate is proportional to the difference between reservoir pressure and wellbore pressure. This assumption leads to a straight line relationship that can be derived from Darcy's law for steady state flow of an incompressible, single phase fluid and is called the Productivity Index (PI). However, this assumption is valid only above the bubble point pressure.

Productivity Index (J)Productivity Index (J)

Vogels Method

Vogels Method

Vogels Graphic Method

9Vogels Graphic Method

IPR for Damaged WellsStandings ModelIPR for damaged or stimulated wells

Conclusions

Inflow Performance RelationshipBy P.E. Eduardo Khoji Endo Hernndeze.endo@hotmail.com