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Steam based-thermal methods for improving oil recovery mainly includes steam injection, steam-assisted gravity drainage (SAGD) and cyclic steam injection (CSS). One of main goal of these methods is to achieve in-situ upgrading of heavy and extra-heavy oil. The high content of high-molecular compounds like asphaltenes is the one of main problems that is need to be solved during the process of the upgrading of heavy oils. Therefore, studying changes in the structure and properties of asphaltenes induced by thermal t...

Asphaltenes extracted from a sample of high-viscosity oils from the Ashalchinskoye deposit of the Republic of Tatarstan and the Boka de Haruko deposit of the Republic of Cuba, as well as a sample of oxidized road bitumen of the BND 50/70 grade produced by TAIF-NK of the Republic of Tatarstan. Five fractions of asphaltenes of these oils and petroleum products were obtained by stepwise extraction with an alcohol-benzene solvent with different alcohol content after precipitation of asphaltenes from oil with hot isooc...

Asphalt-resin-paraffin deposits deposited in the extraction of oils considered difficult to recover are investigated. Specific features of asphalt deposition of resin-paraffin deposits, caused by different content of high-molecular components in them and their properties, are revealed. Redistribution of petroleum paraffin hydrocarbons and asphaltenes between oil and asphalten-resin-paraffinic deposits deposited from them is shown. The process of precipitation of high-molecular components from heavy oil under dynam...

Vanadium and nickel exist in oils as porphyrin complexes. Metalloporphyrins are concentrated in the asphaltene-resinous part of the oil, while the maximum content of vanadium and nickel is accounted for by asphaltenes. Up to the present time, information about features of content and distribution of vanadium, nickel, and the types of the corresponding metal complexes in asphaltenes and resins of heavy oils and natural bitumens has a disparate and non-systemic character. In this work, composition and distribution o...