Drilling EngineeringWell Control
Pressure by Each Barrel of Mud in Casing Formula
Pressure by Each Barrel of Mud in Casing calculates pressure change per barrel of mud for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (D_h, D_p, MW) 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, P_bbl equals 9.496447 psi/bbl.
D_hin
9.625
D_pin
5
MWppg
12
Inputs
D_h
inHole Diameter
D_p
inPipe Diameter
MW
ppgMud Weight
Outputs
P_bbl
psi/bbl
Pressure Change per Barrel of Mud
MW
ppg
Mud Weight
D_h
in
Hole Diameter
D_p
in
Pipe Diameter
Source and review
reviewedFormulas and Calculations for Drilling, Production and Workover, Lapeyrouse, N.J. (2002)
Lapeyrouse, N.J. 2002. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 138.
Source