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