From the previous topic, estimate Height of Influx, you can use influx height to estimate type of influx.
The following equation is used for estimating type of influx:
Note: You can prove the equation by using the U-tube concept.
Influx weight in ppg
Current mud weight in ppg
SICP stands for Shut In Casing Pressure in psi.
SIDPP stands for Shut In Drill Pipe Pressure in psi.
Influx height in ft
Once you know weight of influx, you can compare with these figures below to determine type of influx.
1 – 3 ppg most likely gas influx.
3 – 7 ppg most likely oil kick or combination between gas and oil kick
7 – 9 ppg most likely water influx
With these given information, please determine type of influx.
Shut in casing pressure = 1050 psi
Shut in drill pipe pressure = 750 psi
Height of influx = 450 ft
Current Mud Weight = 14.0 ppg
Influx weight = 1.2 ppg
According to the criteria above, the influx is most likely gas kick.