Production EngineeringWell Performance
Gilbert Critical Choke Liquid Rate Formula
Gilbert Critical Choke Liquid Rate calculates liquid flow rate for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (P_wh, D64, GLR_Mscf) 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_L equals 600.789987 bbl/day.
P_whpsig
460
D6464th inch
22
GLR_MscfMscf/STB
0.4
Inputs
P_wh
psigUpstream Wellhead Pressure
D64
64th inchChoke Size
GLR_Mscf
Mscf/STBGas-Liquid Ratio
Outputs
q_L
bbl/day
Liquid Flow Rate
P_wh
psig
Upstream Wellhead Pressure
D64
64th inch
Choke Size
GLR_Mscf
Mscf/STB
Gas-Liquid Ratio
Source and review
reviewedGilbert, W.E. 1954. Flowing and Gas-Lift Well Performance; public choke-performance summaries.
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
Well Performance