Drilling EngineeringWell Control
Kick Analysis - Influx Density Formula
Kick Analysis - Influx Density calculates influx density for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (MW, SICP, SIDPP, h_i) 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, I equals 4.307692 ppg.
MWppg
12
SICPpsi
1200
SIDPPpsi
800
h_ift
1000
Inputs
MW
ppgMud Weight
SICP
psiShut-In Casing Pressure
SIDPP
psiShut-In Drill Pipe Pressure
h_i
ftHeight of Influx
Outputs
I
ppg
Influx Density
MW
ppg
Mud Weight
SICP
psi
Shut-In Casing Pressure
SIDPP
psi
Shut-In Drill Pipe Pressure
h_i
ft
Height of Influx
Source and review
reviewedLapeyrouse, N.J. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 127.
Source