PO.IPR.HW.SS.PI.ByBorisov
Description
Calculates steady state productivity index for horizontal well using Borisov method (isotropic reservoir), [STB/(d.psi)].
Syntax
=PO.IPR.HW.SS.PI.ByBorisov(L, Rw, Re, h, K, Bl, Ul)Parameters
| Parameter | Description |
|---|---|
| L | Length of the horizontal part of the well, [ft]. |
| Rw | Wellbore radius, [ft]. |
| Re | Drainage radius of the horizontal well, [ft]. |
| h | Reservoir thickness, [ft]. |
| K | Permeability, [mD]. |
| Bl | Liquid formation volume factor, [bbl/STB]. |
| Ul | Liquid viscosity, [cP]. |
SI Unit Version
Lambda Name
PO.IPR.HW.SS.PI.ByBorisov.SIFormula
=LAMBDA(L, Rw, Re, h, K, Bl, Ul, LET(
L_ft, PO.UnitConverter(L, "m", "ft"),
Rw_ft, PO.UnitConverter(Rw, "m", "ft"),
Re_ft, PO.UnitConverter(Re, "m", "ft"),
h_ft, PO.UnitConverter(h, "m", "ft"),
result_STBdpsi, PO.IPR.HW.SS.PI.ByBorisov(L_ft, Rw_ft, Re_ft, h_ft, K, Bl, Ul),
result_STBdpsi * PO.UnitConverter(1, "bbl/d", "m3/d") / PO.UnitConverter(1, "psi", "kPa")))SI Parameters
| Parameter | Unit | Description |
|---|---|---|
L |
m | Length of the horizontal part of the well, [m] |
Rw |
m | Wellbore radius, [m] |
Re |
m | Drainage radius of the horizontal well, [m] |
h |
m | Reservoir thickness, [m] |
K |
- | Permeability, [mD] |
Bl |
- | Liquid formation volume factor, [m3/sm3] |
Ul |
- | Liquid viscosity, [cP] |
How to save as a reusable Excel function
LAMBDA is a built-in Excel feature (Microsoft 365) that lets you create custom functions without VBA. The formula above works as-is when pasted into a cell.
To save a LAMBDA as a reusable named function:
- Go to Formulas → Name Manager → New
- Enter a name, e.g.
PO.IPR.HW.SS.PI.ByBorisov.SI - In Refers to, paste the LAMBDA formula without the trailing invocation
(...) - Click OK
Now use =PO.IPR.HW.SS.PI.ByBorisov.SI(...) anywhere in your workbook.