| http://www.w3.org/ns/prov#value | - The ever-increasing worldwide demand for energy has led to the upgrading of heavy crude oil and asphaltene-rich feedstocks becoming viable refining options for the petroleum industry. ... fractions of heavy petroleums were examd. ... changes, introduction of miscible gases and liqs., mixing with diluents and other oils, and, during acid stimulation, hot oiling and other oilfield operations. ...
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