Production EngineeringWell Performance
Separator Gas Capacity from Diameter Formula
Separator Gas Capacity from Diameter calculates maximum actual gas flow capacity for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (D, F_G, V_Gmax) 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_a_max equals 10.783934 ft3/s.
Dft
3
F_Gfraction
1
V_Gmaxft/s
1.5256146302392357
Inputs
D
ftSeparator Inside Diameter
F_G
fractionFraction of Vessel Cross-Section Available for Gas Flow
V_Gmax
ft/sMaximum Allowable Superficial Gas Velocity
Outputs
q_a_max
ft3/s
Maximum Actual Gas Flow Capacity
D
ft
Separator Inside Diameter
F_G
fraction
Fraction of Vessel Cross-Section Available for Gas Flow
V_Gmax
ft/s
Maximum Allowable Superficial Gas Velocity
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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