Production EngineeringWell Performance
Choke Discharge Coefficient Formula
Choke Discharge Coefficient calculates choke discharge coefficient for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (d, d_c, N_R) 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, C_d equals 0.977586 dimensionless.
din
4
d_cin
1
N_Rdimensionless
10000
Inputs
d
inUpstream Pipe Diameter
d_c
inChoke Diameter
N_R
dimensionlessReynolds Number Based on Choke Diameter
Outputs
C_d
dimensionless
Choke Discharge Coefficient
N_R
dimensionless
Reynolds Number Based on Choke Diameter
Source and review
reviewedGuo, B., Lyons, W.C., and Ghalambor, A. 2007. Petroleum Production Engineering: A Computer-Assisted Approach, Page 5/60.
SourceRelated formulas and calculators
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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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