Drilling fluids, both fresh and saline, containing additives and compositions, predominantly nonionic in nature, for {HEAD ~ the beneficiation} of {TAIL ~ bentonite} in such drilling slurries are described 
of
Drilling fluids , both fresh and saline , containing additives and compositions , predominantly nonionic in nature , for { HEAD ~ the beneficiation } of { TAIL ~ bentonite } in such drilling slurries are described
OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH