PO.IPR.GW.PSS.Time
Description
Calculates time to reach pseudosteady state (stabilized flow boundary) in gas well, [h].
Syntax
=PO.IPR.GW.PSS.Time(Re, Rw, K, porosity, Ct, Ug)Parameters
| Parameter | Description |
|---|---|
| Re | Drainage radius, [ft]. |
| Rw | Wellbore radius, [ft]. |
| K | Permeability, [mD]. |
| porosity | Porosity, [fraction]. |
| Ct | Total compressibility, [1/psi]. |
| Ug | Gas viscosity, [cP]. |
SI Unit Version
Lambda Name
PO.IPR.GW.PSS.Time.SIFormula
=LAMBDA(Re, Rw, K, porosity, Ct, Ug, LET(
Re_ft, PO.UnitConverter(Re, "m", "ft"),
Rw_ft, PO.UnitConverter(Rw, "m", "ft"),
Ct_1psi, PO.UnitConverter(Ct, "1/kPa", "1/psi"),
PO.IPR.GW.PSS.Time(Re_ft, Rw_ft, K, porosity, Ct_1psi, Ug)))SI Parameters
| Parameter | Unit | Description |
|---|---|---|
Re |
m | Drainage radius, [m] |
Rw |
m | Wellbore radius, [m] |
K |
- | Permeability, [mD] |
porosity |
- | Porosity, [fraction] |
Ct |
1/kPa | Total compressibility, [1/kPa] |
Ug |
- | Gas 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.GW.PSS.Time.SI - In Refers to, paste the LAMBDA formula without the trailing invocation
(...) - Click OK
Now use =PO.IPR.GW.PSS.Time.SI(...) anywhere in your workbook.