Production EngineeringWell Performance
Separator Actual Gas Velocity Formula
Separator Actual Gas Velocity calculates actual superficial gas velocity for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (q_a, D, F_G) 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, V_G equals 1.414711 ft/s.
q_aft3/s
10
Dft
3
F_Gfraction
1
Inputs
q_a
ft3/sActual Gas Flow Rate at Separator Conditions
D
ftSeparator Inside Diameter
F_G
fractionFraction of Vessel Cross-Section Available for Gas Flow
Outputs
V_G
ft/s
Actual Superficial Gas Velocity
q_a
ft3/s
Actual Gas Flow Rate at Separator Conditions
D
ft
Separator Inside Diameter
F_G
fraction
Fraction of Vessel Cross-Section Available for Gas Flow
Source and review
reviewedJohn M. Campbell / PetroSkills. Gas-Liquid Separators Sizing Parameter.
SourceRelated formulas and calculators
Effective Wellbore Radius of a Well in Presence of Uniform Flux Fractures
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Effective Wellbore Radius of a Horizontal Well – Method 1 (Anisotropic Reservoirs)
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Effective Wellbore Radius of a Horizontal Well – van der Vlis et al. Method
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