This invention provides {HEAD ~ an apparatus} and process for producing heavy crude oil from a subterranean formation penetrated by {TAIL ~ a well bore} 
This invention provides { HEAD ~ an apparatus } and process for producing heavy crude oil from a subterranean formation penetrated by { TAIL ~ a well bore }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL