Drilling EngineeringWell Control
Casing Pressure Increase Rate from Gas Migration Formula
Casing Pressure Increase Rate from Gas Migration calculates casing pressure increase rate for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (RGM, MWG) 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_inc_rate equals 400.4 psi/hr.
RGMft/hr
616
MWGpsi/ft
0.65
Inputs
RGM
ft/hrGas Migration Rate
MWG
psi/ftMud Pressure Gradient
Outputs
P_inc_rate
psi/hr
Casing Pressure Increase Rate
RGM
ft/hr
Gas Migration Rate
MWG
psi/ft
Mud Pressure Gradient
Source and review
reviewedDrillingFormulas.com actual gas migration rate relationship rearranged for pressure-increase rate.
Source