Drilling EngineeringWell Control
Formation Integrity Test Pressure Formula
Formation Integrity Test Pressure calculates surface pressure required for formation integrity test for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (FIT, MW, TVD) 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_FIT equals 1,102.4 psi.
FITppg
14.5
MWppg
9.2
TVDft
4000
Inputs
FIT
ppgRequired Formation Integrity Test Equivalent Mud Weight
MW
ppgCurrent Mud Weight
TVD
ftTrue Vertical Depth at Casing Shoe
Outputs
P_FIT
psi
Surface Pressure Required for Formation Integrity Test
FIT
ppg
Required Formation Integrity Test Equivalent Mud Weight
MW
ppg
Current Mud Weight
TVD
ft
True Vertical Depth at Casing Shoe
Source and review
reviewedDrilling Formulas and Drilling Calculations. Formation Integrity Test (FIT).
Source