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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...