Production EngineeringWell Performance
Three-Phase Separator Liquid Retention Volume Formula
Three-Phase Separator Liquid Retention Volume calculates required total liquid settling volume for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (W_o, t_o, W_w, t_w) 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, V_req equals 13.194444 bbl.
W_obbl/day
3000
t_omin
3
W_wbbl/day
2000
t_wmin
5
Inputs
W_o
bbl/dayOil Flow Rate
t_o
minOil Retention Time
W_w
bbl/dayWater Flow Rate
t_w
minWater Retention Time
Outputs
V_req
bbl
Required Total Liquid Settling Volume
W_o
bbl/day
Oil Flow Rate
t_o
min
Oil Retention Time
W_w
bbl/day
Water Flow Rate
t_w
min
Water Retention Time
Source and review
reviewedOil and Gas Separation Design Manual liquid capacity equation and listed oil-gas-water retention-time criteria.
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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