Features of the change in the composition heavy oils of various types and solid asphaltite in the hydrothermal-catalytic conditions

Thermal EOR International Workshop III: "Thermal Methods for Enhanced Oil Recovery: Laboratory Testing, Simulation and Oilfields Applications"

Kayukova, G.^1^2 ; Abdrafikova, I.^1 ; Vakhin, A.^1 ; Antipenko, V.^3

Kazan Federal University, 18 Kremlevskaya Str., Kazan, Russia^1

Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russia^2

Institute of Petroleum Chemistry, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia^3

关键词: Biochemical process;    Catalytic conditions;    High molecular weight;    Model experiments;    Natural conditions;    Number of carbon atoms;    Sedimentary strata;    Thermally unstable;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/282/1/012011/pdf
DOI  :  10.1088/1755-1315/282/1/012011

来源: IOP

【 摘 要 】

The paper reveals the distinctive features of the change in the composition heavy oils of various types and of natural bitumen- A sphaltite from the sandstones of the Permian sediments of the Spiridonovsky field in the territory of Tatarstan, in model experiments at a temperature of 250°C, characteristic for steam-thermal impact on the formation, and the pressure in the system of not more than 2 MPa. The choice of low pressure is due to the fact that bituminous rocks in the Permian sediments occur at relatively shallow depths in the near-surface deposits of the sedimentary strata, which necessitates the development of special technologies for their extraction. The experiments used natural iron oxide-hematite. As a part of the products of asphaltite conversion under the influence of hydrothermal-catalytic factors, the content of hydrocarbons almost 4-fold, the content of alcohol-benzene resins and asphaltenes decreases. The content of benzene resins increases somewhat. The composition of asphaltite proved to be less stable than of heavy oils from age-old sediments, apparently due to special conditions for the formation of its composition in natural conditions under the influence of secondary low-temperature biochemical processes that led to the accumulation of thermally unstable resinous-asphaltene components. Compared with the original asphaltite, in the products of the experiment, the content of alkanes of composition C10-C30 substantially increases with an obvious predominance of homologues with an even number of carbon atoms in the molecule. The product is characterized by a lesser degree of aromaticity and content of sulfoxide groups. The results of the studies showed the possibility of upgrading the composition of solid bitumen- A sphaltite in in situ conversion by diluting its composition with lighter newly formed hydrocarbons, due to the destruction of its high molecular weight components.