It is an object of the present invention to provide a system which will monitor the pit volume change with the pumps off and compare the current pit volume change in {TAIL ~ real time} with {HEAD ~ that observed} on previous occasions when the pumps were turned off, thereby allowing the characterization of wellbore breathing and the rapid detection of any formation fluid influx or “kick” 
It is an object of the present invention to provide a system which will monitor the pit volume change with the pumps off and compare the current pit volume change in { TAIL ~ real time } with { HEAD ~ that observed } on previous occasions when the pumps were turned off , thereby allowing the characterization of wellbore breathing and the rapid detection of any formation fluid influx or “ kick ”
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