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