Drilling EngineeringWell Control
Riser Hydrostatic Loss on Disconnect Formula
Riser Hydrostatic Loss on Disconnect calculates bottomhole pressure loss from riser disconnect for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (MW, WD, AG, SW) 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_riser equals 592.8 psi.
MWppg
12
WDft
3000
AGft
100
SWppg
8.6
Inputs
MW
ppgRiser Mud Weight
WD
ftWater Depth
AG
ftAir Gap
SW
ppgSeawater Equivalent Density
Outputs
dP_riser
psi
Bottomhole Pressure Loss from Riser Disconnect
MW
ppg
Riser Mud Weight
WD
ft
Water Depth
AG
ft
Air Gap
SW
ppg
Seawater Equivalent Density
Source and review
reviewedIADC WellSharp Formula Sheet, field units, riser margin relationship.
Source