**Description**

Time to pseudosteady state for regular shape drainage area, [h]

**Excel Function Syntax**

TimeToPSS(Re, K, Ul, porosity, Ct)

**Online Calculator**

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**Description**

Time to pseudosteady state for regular shape drainage area, [h]

**Excel Function Syntax**

TimeToPSS(Re, K, Ul, porosity, Ct)

**Online Calculator**

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)]

ProdIndexHorWellBO

Pseudosteady state productivity index for horizontal well, [STB/(d.psi)] The Babu Odeh method for a box-shaped , anisotropic reservoir, with a well placed parallel to X(box length)-direction.

ProdIndexHorWellBO2

Pseudosteady state productivity index for horizontal well, [STB/(d.psi)] The Babu Odeh method for a box-shaped , anisotropic reservoir, with a well centrally placed parallel to X(box length)-direction.

DrainageRadius

Effective drainage radius, [ft]

DrainageAreaHorWell1

The horizontal well drainage area is represented by two half circles of radius b at each end and a rectangle, of dimensions L(2b), in the center. (Joshi Method 1), [acres]

DrainageAreaHorWell2

The horizontal well drainage area is an ellipse. (Joshi Method 2), [acres]

EffectiveWellboreRadius

Effective wellbore radius, [ft]

EquivalentSkinFactor

Equivalent skin factor for vertical well with hydraulic fracture.

FlowRatePSSVogel

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

FlowRatePSS

Pseudosteady state production flow rate, [STB/d]

ProdIndexPSS

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

FlowRateSSVogel

FlowRateSSVogel – Vogel inflow performance for Steady state flow, [STB/d]

FlowRateSS

Steady state production flow rate, [STB/d]

ProdIndexSS

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

FlowRateTFVogel

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

FlowRateTF

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

ProdIndexTF

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

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