The present invention relates to equipment and techniques for monitoring wellbore drilling fluid during {HEAD ~ the make} up of {TAIL ~ oil field} tubular connections 
up of
The present invention relates to equipment and techniques for monitoring wellbore drilling fluid during { HEAD ~ the make } up of { TAIL ~ oil field } tubular connections
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH