Drilling EngineeringDrilling Hydraulics
Linear Annular Capacity of Pipe Formula
Linear Annular Capacity of Pipe calculates linear annular capacity for drilling hydraulics workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (D_h, D_o) are known and the assumptions behind the cited drilling hydraulics 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_o equals 0.0459 bbl/ft.
D_hin
8.5
D_oin
5
Inputs
D_h
inHole or casing inside diameter
D_o
inPipe outside diameter
Outputs
C_o
bbl/ft
Linear annular capacity
D_h
in
Hole or casing inside diameter
D_o
in
Pipe outside diameter
Source and review
reviewed501 Solved Problems and Calculations for Drilling Operations, Robello, S.E. (2015)
Samuel, E. Robello. 501 Solved Problems and Calculations for Drilling Operations, Sigma Quadrant, Houston, Texas, 2015, Page 44.
Source