Drilling EngineeringDrilling Hydraulics
Strokes per Minute Required for Target Annular Velocity Formula
Strokes per Minute Required for Target Annular Velocity calculates pump speed required for drilling hydraulics workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (AV, AC, q_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, SPM equals 75 strokes/min.
AVft/min
150
ACbbl/ft
0.05
q_obbl/stroke
0.1
Inputs
AV
ft/minTarget Annular Velocity
AC
bbl/ftAnnular Capacity
q_o
bbl/strokePump Output
Outputs
SPM
strokes/min
Pump Speed Required
AV
ft/min
Target Annular Velocity
AC
bbl/ft
Annular Capacity
q_o
bbl/stroke
Pump Output
Source and review
reviewedLapeyrouse, N.J. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 12.
Source