Kick behaviour can be significantly different in highly deviated and horizontal wells. If influx is mainly gas, problems can be experienced getting the gas to move out of the horizontal section. It maybe impossible to remove the gas if the horizontal section is greater than 90 degrees. Swabbed influxes can be hard to detect in horizontal sections and care must be taken while making connections or tripping in these sections of the hole. Drill pipe pressure graphs will also be significantly different for horizontal and deviated wells.
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