Drilling EngineeringDrilling Hydraulics
Bit Nozzle Pressure Loss Formula
Bit Nozzle Pressure Loss calculates bit nozzle pressure loss for drilling hydraulics workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (Q, MW, N_1, N_2, N_3) 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_b equals 3,018.904321 psi.
Qgpm
600
MWppg
10
N_11/32 in
12
N_21/32 in
12
N_31/32 in
12
Inputs
Q
gpmCirculation Rate
MW
ppgMud Weight
N_1
1/32 inNozzle 1 Size
N_2
1/32 inNozzle 2 Size
N_3
1/32 inNozzle 3 Size
Outputs
P_b
psi
Bit Nozzle Pressure Loss
Q
gpm
Circulation Rate
MW
ppg
Mud Weight
N_1
1/32 in
Nozzle 1 Size
N_2
1/32 in
Nozzle 2 Size
N_3
1/32 in
Nozzle 3 Size
Source and review
reviewedLapeyrouse, N.J. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 170.
Source