PO.FRAC.Leakoff.Cc
Description
Compressibility-controlled leakoff coefficient (Cc), [ft/sqrt(min)].
Syntax
=PO.FRAC.Leakoff.Cc(K, porosity, ct, dP, Ures)Parameters
| Parameter | Description |
|---|---|
| K | Formation permeability, [mD]. |
| porosity | Formation porosity, [fraction]. |
| ct | Total compressibility, [1/psi]. |
| dP | Pressure difference (Pfrac - Pres), [psi]. |
| Ures | Reservoir fluid viscosity, [cp]. |
SI Unit Version
Lambda Name
PO.FRAC.Leakoff.Cc.SIFormula
=LAMBDA(K, porosity, ct, dP, Ures, LET(
ct_1psi, PO.UnitConverter(ct, "1/kPa", "1/psi"),
dP_psi, PO.UnitConverter(dP, "kPa", "psi"),
result_ft, PO.FRAC.Leakoff.Cc(K, porosity, ct_1psi, dP_psi, Ures),
PO.UnitConverter(result_ft, "ft", "m")))SI Parameters
| Parameter | Unit | Description |
|---|---|---|
K |
- | Formation permeability, [mD] |
porosity |
- | Formation porosity, [fraction] |
ct |
1/kPa | Total compressibility, [1/kPa] |
dP |
kPa | Pressure difference (Pfrac - Pres), [kPa] |
Ures |
- | Reservoir fluid 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.FRAC.Leakoff.Cc.SI - In Refers to, paste the LAMBDA formula without the trailing invocation
(...) - Click OK
Now use =PO.FRAC.Leakoff.Cc.SI(...) anywhere in your workbook.