PO.ESP.Nodal.Drawdown
Description
Calculates drawdown at given production rate, [psi].
Syntax
=PO.ESP.Nodal.Drawdown(Q, PI)Parameters
| Parameter | Description |
|---|---|
| Q | Production rate, [STB/d]. |
| PI | Productivity index, [STB/d/psi]. |
SI Unit Version
Lambda Name
PO.ESP.Nodal.Drawdown.SIFormula
=LAMBDA(Q, PI, LET(
Q_STBd, PO.UnitConverter(Q, "m3/d", "STB/d"),
PI_field, PI*PO.UnitConverter(1, "psi", "kPa")/PO.UnitConverter(1, "STB/d", "m3/d"),
result_psi, PO.ESP.Nodal.Drawdown(Q_STBd, PI_field),
PO.UnitConverter(result_psi, "psi", "kPa")))SI Parameters
| Parameter | Unit | Description |
|---|---|---|
Q |
m3/d | Production rate, [m3/d] |
PI |
m3/d/kPa | Productivity index, [m3/d/kPa] |
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.ESP.Nodal.Drawdown.SI - In Refers to, paste the LAMBDA formula without the trailing invocation
(...) - Click OK
Now use =PO.ESP.Nodal.Drawdown.SI(...) anywhere in your workbook.