Drilling EngineeringWell Control
Casing Pressure After Subsea Start-Up Formula
Casing Pressure After Subsea Start-Up calculates casing or choke pressure after subsea start-up for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (SICP, P_cl) 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_start equals 650 psi.
SICPpsi
800
P_clpsi
150
Inputs
SICP
psiShut-In Casing Pressure
P_cl
psiChoke Line Friction Loss
Outputs
P_start
psi
Casing or Choke Pressure After Subsea Start-Up
SICP
psi
Shut-In Casing Pressure
P_cl
psi
Choke Line Friction Loss
Source and review
reviewedIADC WellSharp Formula Sheet, field units, casing or choke pressure after subsea start-up.
Source