Production EngineeringWell Performance
Multiphase Wellhead Pressure Across Choke Formula
Multiphase Wellhead Pressure Across Choke calculates upstream wellhead pressure for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (C_choke, R, m, q_L, S, n) 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, P_wh equals 239.207983 psi.
C_chokedimensionless
10
Rscf/bbl
600
mdimensionless
0.5
q_Lbbl/day
500
S1/64 in
32
ndimensionless
1.8
Inputs
C_choke
dimensionlessEmpirical Choke Constant
R
scf/bblProducing Gas-Liquid Ratio
m
dimensionlessGas-Liquid Ratio Exponent
q_L
bbl/dayGross Liquid Rate
S
1/64 inChoke Size
n
dimensionlessChoke Size Exponent
Outputs
P_wh
psi
Upstream Wellhead Pressure
q_L
bbl/day
Gross Liquid Rate
S
1/64 in
Choke Size
R
scf/bbl
Producing Gas-Liquid Ratio
C_choke
dimensionless
Empirical Choke Constant
Source and review
reviewedGuo, B., Lyons, W.C., and Ghalambor, A. Petroleum Production Engineering: A Computer-Assisted Approach, Page 5/64.
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