When the kick occurs during drilling, the well can be killed directly since:

1.  The formation fluids can be circulated out
2. The existing mud canbereplaced witha mud withsufficient density to overbalance the formation pressure

If a kick is detected during a trip the drillstring must be stripped to bottom, otherwise the influx cannot be circulated out. Stripping is the process by which pipe is allowed to move through the closed BOPs under its own weight. Snubbing is where the pipe is forced through the BOP mechanically. There are basically two methods of killing the well when the drillstring is at the
bottom of the borehole. These are:
•     The One Circulation Method
•     The Drillers Method

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