PO.IPR.VW.PSS.Rate.ByFetkovich
Description
Calculates Fetkovich backpressure IPR flow rate for oil, [STB/d]. Fetkovich (1973) correlation.
Syntax
=PO.IPR.VW.PSS.Rate.ByFetkovich(C, n, Pres, Pwf)Parameters
| Parameter | Description |
|---|---|
| C | Performance coefficient, [STB/(d·psi^2n)]. |
| n | Flow exponent (0.5 to 1.0), [dimensionless]. |
| Pres | Average reservoir pressure, [psia]. |
| Pwf | Bottom-hole flowing pressure, [psia]. |
SI Unit Version
Lambda Name
PO.IPR.VW.PSS.Rate.ByFetkovich.SIFormula
=LAMBDA(C, n, Pres, Pwf, LET(
C_field, C * PO.UnitConverter(1, "psi", "kPa")^(2*n) / PO.UnitConverter(1, "STB/d", "m3/d"),
Pres_psi, PO.UnitConverter(Pres, "kPa", "psi"),
Pwf_psi, PO.UnitConverter(Pwf, "kPa", "psi"),
result_STBd, PO.IPR.VW.PSS.Rate.ByFetkovich(C_field, n, Pres_psi, Pwf_psi),
PO.UnitConverter(result_STBd, "STB/d", "m3/d")))SI Parameters
| Parameter | Unit | Description |
|---|---|---|
C |
m3/(d·kPa^2n) | Performance coefficient, [m3/(d·kPa^2n)] |
n |
- | Flow exponent (0.5 to 1.0), [dimensionless] |
Pres |
kPa | Average reservoir pressure, [kPa] |
Pwf |
kPa | Bottom-hole flowing pressure, [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.IPR.VW.PSS.Rate.ByFetkovich.SI - In Refers to, paste the LAMBDA formula without the trailing invocation
(...) - Click OK
Now use =PO.IPR.VW.PSS.Rate.ByFetkovich.SI(...) anywhere in your workbook.