Laminar Gas Flow Rate from Real-Gas Pseudopressure Formula
Laminar Gas Flow Rate from Real-Gas Pseudopressure calculates gas flow rate for well performance workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k, h, phi_r, phi_wf, T, A, C_A, r_w, S) are known and the assumptions behind the cited well performance 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, Q_g equals 56,547.157551 MSCF/day.
50
40
900000000
600000000
600
4356000
31.6
0.328
5
Inputs
k
mDPermeability
h
ftFormation Thickness
phi_r
psi^2/cPAverage Reservoir Real-Gas Pseudopressure
phi_wf
psi^2/cPFlowing Real-Gas Pseudopressure
T
degRReservoir Temperature
A
ft^2Drainage Area
C_A
dimensionlessShape Factor
r_w
ftWellbore Radius
S
dimensionlessSkin Factor
Outputs
Q_g
Gas Flow Rate
phi_r
Average Reservoir Real-Gas Pseudopressure
phi_wf
Flowing Real-Gas Pseudopressure
k
Permeability
h
Formation Thickness
Source and review
reviewedAdvanced Reservoir Engineering, Ahmed, T., McKinney, P. D. (2005)
Ahmed, T. and McKinney, P. D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 3, Page 188.
Source