You know about kick tolerance factor from previous section and you can use it to determine the maximum formation pressure which can be controlled when the well is shut in.
This equation below demonstrates you how to calculate it.
Maximum formation pressure = (kick tolerance factor + current mud weight) x 0.052 x TVD of the well
These
Maximum formation pressure in psi
kick tolerance factor in ppg
current mud weight in ppg
TVD of the well in ft
It tells us that if you have bottom hole pressure more than this value, you have a chance to break formation.
Use the following information to determine the maximum formation pressure when shut in
kick tolerance factor = 1.8 ppg
current mud weight = 9.8 ppg
Depth of the well = 10,100’MD/9,500’TVD
Maximum formation pressure = (1.8 + 9.8) x 0.052 x 9500
Maximum formation pressure the can be controlled when shut the well in = 5730 psi.
Please find the calculation sheet >>>
Maximum formation pressure that can be controlled when we shut the well in
Ref book: Formulas and Calculations for Drilling, Production and Workover, Second Edition
You need to then calculate the kick tolerance factor at the shoe and then use the lesser of the two.