Drilling EngineeringWell Control
Shut-In Pressure Increase from Gas Migration Time Formula
Shut-In Pressure Increase from Gas Migration Time calculates shut-in pressure increase for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (RGM, MWG, dt_hr) 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 equals 200.2 psi.
RGMft/hr
616
MWGpsi/ft
0.65
dt_hrhr
0.5
Inputs
RGM
ft/hrGas Migration Rate
MWG
psi/ftMud Pressure Gradient
dt_hr
hrShut-In Time
Outputs
dP
psi
Shut-In Pressure Increase
RGM
ft/hr
Gas Migration Rate
dt_hr
hr
Shut-In Time
Source and review
reviewedDrillingFormulas.com actual gas migration relationship and Drilling Manual gas percolation rate example.
Source