Drilling EngineeringWell Control
New Pump Pressure with Mud Weight Change Formula
New Pump Pressure with Mud Weight Change calculates new pump pressure for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (P_current, MW_new, MW_old) 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_new equals 2,708.333333 psi.
P_currentpsi
2500
MW_newppg
13
MW_oldppg
12
Inputs
P_current
psiCurrent Pump Pressure
MW_new
ppgNew Mud Weight
MW_old
ppgOld Mud Weight
Outputs
P_new
psi
New Pump Pressure
P_current
psi
Current Pump Pressure
MW_new
ppg
New Mud Weight
MW_old
ppg
Old Mud Weight
Source and review
reviewedIADC WellSharp Formula Sheet, field units, formula 21.
Source