Drilling EngineeringMud and Cementing
Top of Cement Depth from Annular Cement Height Formula
Top of Cement Depth from Annular Cement Height calculates top of cement depth for mud and cementing workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (D_set, h_ann) are known and the assumptions behind the cited mud and cementing 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, D_toc equals 2,531.423361 ft.
D_setft
3000
h_annft
468.5766388329014
Inputs
D_set
ftCasing Setting Depth
h_ann
ftCement Height in Annulus
Outputs
D_toc
ft
Top of Cement Depth
D_set
ft
Casing Setting Depth
h_ann
ft
Cement Height in Annulus
Source and review
reviewedLapeyrouse, N.J. 2002. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, calculations for the number of feet to be cemented.
Source