DrainageRadius

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]

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

Effective wellbore radius, [ft]

Equivalent skin factor for vertical well with hydraulic fracture.

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]

Time to stabilized flow in gas well, [h]

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

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)]