**Description**

Transient state productivity index for vertical well, [STB/(d.psi)]

**Excel Function Syntax**

ProdIndexTF(time, K, h, Bl, Ul, porosity, Ct, Rw, S)

**Online Calculator**

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Home » Functions » Well Flow Performance » Oil Well Production » Oil Transient Flow » ProdIndexTF

**Description**

Transient state productivity index for vertical well, [STB/(d.psi)]

**Excel Function Syntax**

ProdIndexTF(time, K, h, Bl, Ul, porosity, Ct, Rw, S)

**Online Calculator**

- ProdIndexTF

FlowRateTFVogel

Vogel inflow performance for transient-state flow, [STB/d]

FlowRateTF

Transient-state production flow rate, [STB/d]

GasFlowRatePSS

GasFlowRatePSS – Gas well flow rate for pseudosteady state condition using Darcy flow approximation, [mscf/d]

GasFlowRatePSSNonDarcy

Gas well stabilized flow rate for pseudosteady state condition, with Non-Darcy flow equation, [mscf/d]

TimeToPSSGas

Time to stabilized flow in gas well, [h]

NonDarcyCoefficient

Correlation for estimating non-Darcy coefficient, [d/mscf]

ProdIndexHorWellBorisov

Horizontal well productivity index under steady state flow. Borisov method for well in an isotropic reservoir, [STB/(d.psi)]

ProdIndexHorWellGRJ

Horizontal well productivity index under steady state flow. The Giger-Reiss-Jourdan method for well in an anisotropic reservoir, [STB/(d.psi)]

ProdIndexHorWellJoshi

Horizontal well productivity index under steady state flow. The Joshi method for well in an anisotropic reservoir, [STB/(d.psi)]

ProdIndexHorWellRD

Horizontal well productivity index under steady state flow. The Renard-Dupuy method for well in an anisotropic reservoir, [STB/(d.psi)]

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