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