Drilling EngineeringDrilling Hydraulics
New Pump Circulating Pressure - Square Law Formula
New Pump Circulating Pressure - Square Law calculates new circulating pressure for drilling hydraulics workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (P_current, N_new, N_old) 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, P_new equals 976.5625 psi.
P_currentpsi
2500
N_newstrokes/min
25
N_oldstrokes/min
40
Inputs
P_current
psiCurrent Circulating Pressure
N_new
strokes/minNew Pump Rate
N_old
strokes/minOld Pump Rate
Outputs
P_new
psi
New Circulating Pressure
P_current
psi
Current Circulating Pressure
N_new
strokes/min
New Pump Rate
N_old
strokes/min
Old Pump Rate
Source and review
reviewedLapeyrouse, N.J. 2002. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 27.
Source