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