Drilling EngineeringDrilling Hydraulics
Impact Force per Unit Bit Area Formula
Impact Force per Unit Bit Area calculates impact force per unit bit area for drilling hydraulics workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (MW, V_n, Q, B) 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, IF_a equals 31.694785 lb/in^2.
MWppg
10
V_nft/s
580
Qgpm
600
Bin
8.5
Inputs
MW
ppgMud Weight
V_n
ft/sJet Velocity
Q
gpmCirculation Rate
B
inBit Size
Outputs
IF_a
lb/in^2
Impact Force per Unit Bit Area
MW
ppg
Mud Weight
V_n
ft/s
Jet Velocity
Q
gpm
Circulation Rate
B
in
Bit Size
Source and review
reviewedLapeyrouse, N.J. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 170.
Source