Reservoir EngineeringReserves and Recovery
NGL Production Rate from Gas Rate and Yield Formula
NGL Production Rate from Gas Rate and Yield calculates natural gas liquids production rate for reserves and recovery workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (q_g, Y_NGL) are known and the assumptions behind the cited reserves and recovery 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_NGL equals 100 bbl/day.
q_gMscf/day
5000
Y_NGLbbl/MMscf
20
Inputs
q_g
Mscf/dayWellhead Gas Production Rate
Y_NGL
bbl/MMscfNGL Yield
Outputs
q_NGL
bbl/day
Natural Gas Liquids Production Rate
q_g
Mscf/day
Wellhead Gas Production Rate
Y_NGL
bbl/MMscf
NGL Yield
Source and review
reviewedCED Engineering, Forecasting Oil and Gas Using Decline Curves, NGL yield equations.
Source