The objects and {HEAD ~ advantages} of {TAIL ~ the invention} are achieved by the drilling fluid and the processes of the invention 
of
The objects and { HEAD ~ advantages } of { TAIL ~ the invention } are achieved by the drilling fluid and the processes of the invention
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH