Production EngineeringWell Performance
API RP 14E Required Pipe Inside Diameter Formula
API RP 14E Required Pipe Inside Diameter calculates minimum required pipe inside diameter for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (A_1000, q_L) 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, D_min equals 2.611572 in.
A_1000in2/(1000 bbl/day)
3.1509756190263016
q_Lbbl/day
1700
Inputs
A_1000
in2/(1000 bbl/day)Minimum Flow Area per 1000 Barrels Liquid per Day
q_L
bbl/dayTotal Liquid Rate
Outputs
D_min
in
Minimum Required Pipe Inside Diameter
A_1000
in2/(1000 bbl/day)
Minimum Flow Area per 1000 Barrels Liquid per Day
q_L
bbl/day
Total Liquid Rate
Source and review
reviewedAPI RP 14E Appendix A converts calculated cross-sectional area to inside pipe diameter after the erosional-velocity area check.
SourceRelated formulas and calculators
Effective Wellbore Radius of a Well in Presence of Uniform Flux Fractures
Well Performance
Effective Wellbore Radius of a Horizontal Well – Method 1 (Anisotropic Reservoirs)
Well Performance
Effective Wellbore Radius of a Horizontal Well – van der Vlis et al. Method
Well Performance