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