{TAIL ~ The aqueous alkaline chemical solution} mixes and reacts with produced heavy crude oil in the well bore and ultrasonic waves are emitted into {HEAD ~ the mixture} whereby an emulsion is formed 
{ TAIL ~ The aqueous alkaline chemical solution } mixes and reacts with produced heavy crude oil in the well bore and ultrasonic waves are emitted into { HEAD ~ the mixture } whereby an emulsion is formed
TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH