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]

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

Effective drainage radius, [ft]

Effective wellbore radius, [ft]

Equivalent skin factor for vertical well with hydraulic fracture.

Pseudosteady state production flow rate, [STB/d]

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

Steady state production flow rate, [STB/d]

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

Time to stabilized flow in gas well, [h]

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