The procedure by which {HEAD ~ the viscosity reduction} of {TAIL ~ the heavy crude oil} is achieved includes the use of water or brine with an alkaline chemical additive such as sodium hydroxide, calcium hydroxide, sodium silicates and other strong bases 
of
The procedure by which { HEAD ~ the viscosity reduction } of { TAIL ~ the heavy crude oil } is achieved includes the use of water or brine with an alkaline chemical additive such as sodium hydroxide , calcium hydroxide , sodium silicates and other strong bases
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH