PO.PTA.ToDim.PD
Description
Converts pressure drop to dimensionless pressure, [dimensionless].
Syntax
=PO.PTA.ToDim.PD(P, Pi, q, K, h, B, Ul)Parameters
| Parameter | Description |
|---|---|
| P | Pressure, [psi]. |
| Pi | Original reservoir pressure, [psi]. |
| q | Flow rate at surface, [bbl/D]. |
| K | Matrix permeability, [mD]. |
| h | Net pay thickness, [ft]. |
| B | Formation volume factor, [bbl/STB]. |
| Ul | Viscosity, [cP]. |
SI Unit Version
Lambda Name
PO.PTA.ToDim.PD.SIFormula
=LAMBDA(P, Pi, q, K, h, B, Ul, LET(
P_psi, PO.UnitConverter(P, "kPa", "psi"),
Pi_psi, PO.UnitConverter(Pi, "kPa", "psi"),
q_bbld, PO.UnitConverter(q, "m3/d", "bbl/d"),
h_ft, PO.UnitConverter(h, "m", "ft"),
PO.PTA.ToDim.PD(P_psi, Pi_psi, q_bbld, K, h_ft, B, Ul)))SI Parameters
| Parameter | Unit | Description |
|---|---|---|
P |
kPa | Pressure, [kPa] |
Pi |
kPa | Original reservoir pressure, [kPa] |
q |
m3/d | Flow rate at surface, [m3/d] |
K |
- | Matrix permeability, [mD] |
h |
m | Net pay thickness, [m] |
B |
- | Formation volume factor, [m3/sm3] |
Ul |
- | 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.PTA.ToDim.PD.SI - In Refers to, paste the LAMBDA formula without the trailing invocation
(...) - Click OK
Now use =PO.PTA.ToDim.PD.SI(...) anywhere in your workbook.