Drilling EngineeringWell Control
Maximum Allowable Surface Pressure Governed by Casing Burst Formula
Maximum Allowable Surface Pressure Governed by Casing Burst calculates maximum allowable surface pressure for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (W_o, W_u, H, P_bc, S) 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, MASP equals 3,480 psi.
W_oppg
10
W_uppg
12
Hft
5000
P_bcpsi
5000
Sdimensionless
0.8
Inputs
W_o
ppgMud Weight Behind Casing
W_u
ppgMud Weight in Use
H
ftCasing Shoe True Vertical Depth
P_bc
psiCasing Burst Pressure
S
dimensionlessSafety Factor
Outputs
MASP
psi
Maximum Allowable Surface Pressure
P_bc
psi
Casing Burst Pressure
S
dimensionless
Safety Factor
W_u
ppg
Mud Weight in Use
W_o
ppg
Mud Weight Behind Casing
H
ft
Casing Shoe True Vertical Depth
Source and review
reviewedLapeyrouse, N.J. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 143.
Source