In constructing IPR curves what are the axis?

• A. Y axis is bottom hole pressure pwf, and X axis is flow rate
• B. X axis is bottom hole pressure pwf, and Y axis is flow rate
• C. X axis is pressure, Y axis is time
• D. Y axis is time, X axis is pressure

Answer: (A)

Inflow Performance Relationship shows how much fluid a well can produce for a given bottom-hole flowing pressure. The standard plotting convention places bottom-hole pressure on the vertical axis and production rate on the horizontal axis. This setup makes it clear that increasing flow rate (move right on the X axis) typically comes with a falling bottom-hole pressure (move down on the Y axis), illustrating the pressure-driven nature of deliverability. So the Y axis is the bottom hole pressure pwf, and the X axis is the flow rate.