C298 – Product Type 7 – Cpl and Compressibility Calculation
Description
This calculates the Cpl and compressibility factor for a crude oil according to the Aramco equations for product type 7. It uses the density/specific gravity/API gravity at 60°F of the sample, the temperature and pressure as well as equilibrium pressure of the liquid.
References
FMC Energy Systems – GeoFlo II – DMR – Flow computer manual. – Bulletin MN09034L
FMC Energy Systems – Smith Meter GeoProv – Bidirectional Prover Computer Manual. – Bulletin MN09019L
Aramco Product Type 7 equations
Kelton calculation reference C298
FLOCALC calculation reference F096
Options
Standard Density Input
- Density
- Specific gravity
- API gravity
This option is used to select whether standard density at 60°F will be entered as a density, specific gravity or API gravity.
Constants
| Coefficients for Product Type 7 | ||
| C1 | = | 2.10222 x 10-2 |
| C2 | = | 6.09156 x 10-5 |
| C3 | = | 5.18064 x 10-8 |
| C4 | = | 4.25526 x 10-9 |
| C5 | = | 4.42976 x 10-4 |
| C6 | = | 4.30509 x 10-6 |
| C7 | = | -2.69122 x 10-8 |
| C8 | = | -8.77856 x 10-11 |
| C9 | = | -5.18890 x 10-6 |
| C10 | = | -5.37873 x 10-8 |
| C11 | = | -6.43473 x 10-11 |
| C12 | = | 1.94889 x 10-11 |
| C13 | = | 1.80682 x 10-7 |
| C14 | = | 1.69756 x 10-9 |
| C15 | = | -1.83219 x 10-11 |
| C16 | = | -2.21778 x 10-13 |
| C17 | = | -7.57157 x 10-10 |
| C18 | = | -7.26725 x 10-12 |
| C19 | = | 1.56277 x 10-13 |
| C20 | = | 9.04520 x 10-16 |
Calculation
Compressibility Factor
The compressibility factor is calculated by:
| Where | ||
|---|---|---|
| API60 | = | API gravity at 60°F |
| T | = | Temperature |
| C | = | Coefficients for compressibility equation |
Correction Factor for Pressure
The correction factor for pressure on the liquid, Cpl, is calculated by:
| Where | ||
|---|---|---|
| P | = | Pressure |
| Pe | = | Equilibrium pressure |