All of well control articles in this website are based on gas kick assumption. Therefore, all the responses as bottom hole pressure, surface pressure, gas volume, maximum pit gain, etc are influenced by gas expansion and gas migration. In reality, you may face with water influx or oil influx which is quite different than gas influx.
The following indications showing water or oil kick are listed below:
• When the well is shut in, casing pressure will not increase because water and oil don’t migrate.
• When bumping the float, it is quite clear to see where the float is opened in order to obtain shut in drill pipe pressure.
• While circulating influx out of the wellbore, casing pressure will not increase too high because water and oil don’t expand like gas.