PO.IPR.HW.SS.PI.ByEconomides Function

Description:

Calculates steady state productivity index for horizontal well using Economides-Brand-Frick model (anisotropic reservoir, rectangular drainage), [STB/(d.psi)]. Economides et al. (1994) correlation.

Excel Function Syntax:

=PO.IPR.HW.SS.PI.ByEconomides(L, Rw, Xe, Ye, h, Kx, Ky, Kz, Bl, Ul, Zw)

Parameters:

Parameter	Description
L	Length of horizontal section, [ft].
Rw	Wellbore radius, [ft].
Xe	Drainage extent in x-direction (along well), [ft].
Ye	Drainage extent in y-direction (perpendicular), [ft].
h	Reservoir thickness, [ft].
Kx	Permeability in x-direction, [mD].
Ky	Permeability in y-direction, [mD].
Kz	Permeability in z-direction (vertical), [mD].
Bl	Liquid formation volume factor, [bbl/STB].
Ul	Liquid viscosity, [cP].
Zw	Well vertical position from reservoir bottom, [ft].