Production EngineeringWell Performance
Gas-Liquid Ratio from Gas and Liquid Rates Formula
Gas-Liquid Ratio from Gas and Liquid Rates calculates gas-liquid ratio for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (Q_g, q_L) 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, R equals 5,882.352941 scf/bbl.
Q_gMMscf/day
10
q_Lbbl/day
1700
Inputs
Q_g
MMscf/dayGas Flow Rate
q_L
bbl/dayTotal Liquid Rate
Outputs
R
scf/bbl
Gas-Liquid Ratio
Q_g
MMscf/day
Gas Flow Rate
q_L
bbl/day
Total Liquid Rate
Source and review
reviewedAPI RP 14E Appendix A flowline sizing example computes gas/liquid ratio from total gas flow divided by total liquid rate.
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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