Pseudo-Reduced Conditions Formula
Pseudo-Reduced Conditions calculates pseudo-reduced pressure for gas properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (P, P_cA, P_cB, T, T_cA, T_cB) are known and the assumptions behind the cited gas 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, P_r equals 4.375038 dimensionless.
3000
666
706
600
343
550
Inputs
P
psiPressure
P_cA
psiCritical Pressure of Component A
P_cB
psiCritical Pressure of Component B
T
KTemperature
T_cA
KCritical Temperature of Component A
T_cB
KCritical Temperature of Component B
Outputs
P_r
Pseudo-Reduced Pressure
T_r
Pseudo-Reduced Temperature
P
Pressure
P_cA
Critical Pressure of Component A
P_cB
Critical Pressure of Component B
T
Temperature
T_cA
Critical Temperature of Component A
T_cB
Critical Temperature of Component B
Source and review
reviewedBird, R.B., Stewart, W.E. and Lightfoot, E.N. 2002. Transport Phenomena, 2nd ed., Chapter 17, Page 524.
Source