// multi-utility computation suite · offline · instant · precise
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eng.productivity-index-well Calculator
Calculates well Productivity Index (PI) from stabilised flow test data and estimates inflow at any wellbore pressure. PI (stb/day/psi) = q / (Pbar − Pwf) — the slope of the Inflow Performance Relationship (IPR) curve at stabilised conditions.
Inputs
Q Bbl Day
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
P Res Psi
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
P Wf Psi
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Bo Rb Stb
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Mu Cp
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
Results
productivity index PI (bbl/day/psi)
The result of multiplying all input values together.
AOF at Pwf=0 (bbl/day)
The value at the specified point or condition.
rate at 50% drawdown (bbl/day)
The value at the specified point or condition.
drawdown used ΔP (psi)
The portion already consumed or allocated from the total available.
PI = q/ΔP
Reference formula or conversion factor shown for context.
Vogel correlation for 2-phase
The strength and direction of the linear relationship between the two variables (-1 to +1).