Drilling EngineeringWell Control
Hydrostatic Pressure Drop per Foot Pulling Dry Pipe Formula
Hydrostatic Pressure Drop per Foot Pulling Dry Pipe calculates hydrostatic pressure drop per foot pulling dry pipe for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (MW, D_dp, C_ann, C_dp) are known and the assumptions behind the cited well control 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, dP_dry_ft equals 0.069554 psi/ft.
MWppg
12
D_dpbbl/ft
0.007
C_annbbl/ft
0.045
C_dpbbl/ft
0.0178
Inputs
MW
ppgMud Weight
D_dp
bbl/ftDrill Pipe Displacement
C_ann
bbl/ftAnnular Capacity
C_dp
bbl/ftDrill Pipe Capacity
Outputs
dP_dry_ft
psi/ft
Hydrostatic Pressure Drop per Foot Pulling Dry Pipe
MW
ppg
Mud Weight
D_dp
bbl/ft
Drill Pipe Displacement
C_ann
bbl/ft
Annular Capacity
C_dp
bbl/ft
Drill Pipe Capacity
Source and review
reviewedCudd Well Control Technical Data Book, trip calculations; Wild Well Control technical data sheet dry-pipe trip formulas.
Source