PetrophysicsRock Properties

Air Density for de Nouy Upper Phase Correction Formula

\rho_{air}=4.324\times10^{-2}\frac{P}{T}

Air Density for de Nouy Upper Phase Correction calculates air density for upper phase for rock properties workflows in petrophysics.

Calculate

How engineers use this formula

Use this formula when the listed inputs (P, T) are known and the assumptions behind the cited rock properties relationship match the engineering case being checked.

Assumptions

Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
The declared units match the field-unit constants used in the formula.
The cited formula applies to the selected petroleum engineering workflow.

Limitations

The calculation does not replace a full engineering model or operating procedure.
Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.

Common mistakes

Mixing unit systems without converting the inputs.
Using default example values as field recommendations.
Applying the formula outside the source assumptions.

Default example

Using the default inputs, rho_air equals 0.001222 g/cm^3.

Ppsi

14.7

520

Inputs

P

psi

Pressure

T

Absolute Temperature

Outputs

rho_air

g/cm^3

Air Density for Upper Phase

P

psi

Pressure

T

Absolute Temperature

Source and review

reviewed

Petroleum and Natural Gas Laboratory Course Notes, I-Fluid Properties, Mihcakan, I. M., Alkan, K. H., Ugur, Z. (2001)

Mihcakan, I. M., Alkan, K. H., and Ugur, Z. 2001. Petroleum and Natural Gas Laboratory Course Notes, I-Fluid Properties, ITU Petroleum and Natural Gas Engineering, Page 4-4.

Source