The following formula is the kick tolerance factor.
Where;
Casing shoe TVD in ft
Well depth TVD in ft
Maximum Allowable MW in ppg
Current MW in ppg
For more understanding, let's try to calculate the kick tolerance factor (KTF) using the following information:
Casing shoe TVD = 5000 ft
Well depth TVD = 11,000 ft
Maximum Allowable MW = 12.9 ppg
Current MW =9.8 ppg
According to the equation above, you will be able to calculate like this;
Kick Tolerance Factor =1.41 ppg
Please find the calculation sheet >> Kick Tolerance Factor Calculation
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