The lower end of the tieback member will seal in {HEAD ~ the interior} of {TAIL ~ the casing hanger} 
of
The lower end of the tieback member will seal in { HEAD ~ the interior } of { TAIL ~ the casing hanger }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL