PO.IPR.VW.PSS.PI
Description
Calculates pseudosteady state productivity index for vertical well, [bbl/(D.psi)].
Syntax
=PO.IPR.VW.PSS.PI(K, h, Bl, Ul, Re, Rw, S)Parameters
| Parameter | Description |
|---|---|
| K | Permeability, [mD]. |
| h | Reservoir thickness, [ft]. |
| Bl | Liquid formation volume factor, [bbl/STB]. |
| Ul | Liquid viscosity, [cP]. |
| Re | Drainage radius, [ft]. |
| Rw | Wellbore radius, [ft]. |
| S | Skin factor, [dimensionless]. |
SI Unit Version
Lambda Name
PO.IPR.VW.PSS.PI.SIFormula
=LAMBDA(K, h, Bl, Ul, Re, Rw, S, LET(
h_ft, PO.UnitConverter(h, "m", "ft"),
Re_ft, PO.UnitConverter(Re, "m", "ft"),
Rw_ft, PO.UnitConverter(Rw, "m", "ft"),
result_STBdpsi, PO.IPR.VW.PSS.PI(K, h_ft, Bl, Ul, Re_ft, Rw_ft, S),
result_STBdpsi * PO.UnitConverter(1, "bbl/d", "m3/d") / PO.UnitConverter(1, "psi", "kPa")))SI Parameters
| Parameter | Unit | Description |
|---|---|---|
K |
- | Permeability, [mD] |
h |
m | Reservoir thickness, [m] |
Bl |
- | Liquid formation volume factor, [m3/sm3] |
Ul |
- | Liquid viscosity, [cP] |
Re |
m | Drainage radius, [m] |
Rw |
m | Wellbore radius, [m] |
S |
- | Skin factor, [dimensionless] |
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.VW.PSS.PI.SI - In Refers to, paste the LAMBDA formula without the trailing invocation
(...) - Click OK
Now use =PO.IPR.VW.PSS.PI.SI(...) anywhere in your workbook.