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Within the framework of green chemistry principles, the concept of deep eutectic solvents (DES) was used to develop solid commercial forms of oil-displacing compositions. It has been shown that the eutectic composition on the phase diagram of the binary system ammonium salt - carbamide corresponds to DES as the basis of solid commercial forms of oil-displacing composition with the best physicochemical and technological characteristics. The optimal concentrations of solid commercial forms in the working solution of the composition were determined for the ternary DES system ammonium salt - carbamide - water. The results of laboratory studies and field tests of the working solution based on the solid commercial forms of the oil-displacing composition are presented.

Postsynthetic treatment of ZSM-5 zeolite with an aqueous solution of NaOH was carried out, followed by the modification of the treated zeolite with nanosized nickel powder. Nickel powder is introduced into the zeolite by dry mechanical mixing. The textural, acidic and catalytic properties of the original ZSM-5 zeolite and zeolite-based samples after alkaline treatment and modification are studied. The catalytic activity of zeolites has been studied in the process of conversion of straight-run gasoline fraction of oil. Along with determining the characteristics of the target reaction products - high-octane gasolines, an analysis of the resulting gaseous hydrocarbons and carbon compaction products (coke) was carried out. It has been established that alkaline treatment of zeolite and its subsequent mixing with nickel nanopowder leads to a decrease in the total specific surface area and total specific pore volume, a decrease in the concentration of acid sites and an increase in their strength. The enhancement of the combined effect of alkaline treatment and modification with nickel nanopowder on the textural and acidic properties of zeolite catalysts was determined. It has been shown that modification of zeolite catalysts has almost no effect on the composition of gaseous products formed in the conversion of straight-run gasoline fraction of oil. Post-synthetic alkaline treatment of ZSM-5 zeolite significantly reduces its aromatising and cracking activity, resulting in an increased yield of high-octane gasoline with improved environmental characteristics. The introduction of nickel nanopowder into alkali-treated zeolite enhances this trend, although not significantly. On modified zeolites, the amount of carbon compaction products is reduced, which will increase the time of stable operation of the resulting catalysts and improve the conditions for their regeneration.

Resins extracted from heavy high-viscous oil of the Nurlat oilfield were investigated. The composition of fragments bound through sulphide and ether bridges in the molecules of initial resins and the liquid products of their conversion at 450 ^oC under the conditions of laboratory experiment was studied using a set of physicochemical methods (IR spectroscopy, UV spectroscopy, gas chromatography -mass spectrometry, chemical destruction). It is shown that the fragments undergoing destruction are mainly those bound in the structure of the initial sample through the least thermally stable functional groups of esters and aliphatic sulphides. Sulphur- and ether-bound compounds in the structure of both resin samples are represented by n -alkanes, n -alkylcyclopentanes, n -alkylcyclohexanes and hopanes. The presence of nickel porphyrins was established among the sulphur-bound compounds. It is the molecular composition of bound n -alkanes that changes most noticeably during thermolysis. Ether bond cleavage in the molecules of secondary resins leads to the formation of products containing mono- and dibromides of alkyl biphenyls. This fact provides evidence that these aromatic compounds are present in resins in the form of fragments bound with other structural fragments through one and two ether bridges.

The extraction of sulphur-containing compounds of diesel fuel (DF) with ionic liquids (IL) based on imidazole with various substituents (butyl, octyl, nonyl, dodecyl, cetyl) in position 1 of the imidazole ring has been studied; the composition of sulphur-containing compounds and polycyclic aromatic hydrocarbons (PAH) has been determined by gas chromatography - mass spectrometry in the initial and purified diesel fuel. The optimal extraction conditions are determined: temperature 30-35 °C, extraction time 60 min, DF/IL ratio 1.66-2. The most effective extractant for the sulphur-containing compounds of DF is 1-nonyl-3-methylimidazolium bromide, which allows reducing the total sulphur content from 0.369 to 0.143 wt%. Results of the studies of group and individual composition of dibenzothiophene (DBT) and PAH derivatives show that the degree of extraction of DBT derivatives and tricyclic aromatic hydrocarbons is 66-72%. Naphthalene and its homologues are extracted to a lesser extent - 37%. Among DBT homologues, dimethyldibenzothiophene is extracted most completely.

The results of rheological measurements of a low-temperature composition based on inorganic components developed at the Institute of Petroleum Chemistry SB RAS (GALKA ^® ) are presented. The studies were carried out with a Haake Viscotester IQ rheometer using CC25 geometry (oscillation mode at a frequency of 1 Hz) at different temperatures. The amplitude test determined the range of strain and stress amplitude values corresponding to the range of linear viscoelasticity. For a given value of the deformation amplitude from the range of linear viscoelasticity, the dependences of the complex viscosity modulus (|η*|), the elastic modulus (storage modulus, G' ), and the viscosity modulus (loss modulus, G'' ) on time were recorded at a temperature of 38, 30, and 20 ºС. The kinetics of the gel formation process was characterized, the maximum strength of the formed structure was estimated from the maximal elastic modulus, the time of its formation and the starting points of gelation were determined.

A composition characterised by adjustable physicochemical parameters within a broad range has been developed relying on the results of studies of the phase equilibria in the ternary system of deep eutectic solvents (DES) glycerol - carbamide - boric acid. The effect of this composition on oil recovery enhancement is studied, and results obtained in the laboratory studies of the effect of DES-based composition on the filtration characteristics of a heterogeneous formation in the carbonate reservoir of the Usinsk field are presented. The efficiency of the composition for oilfields at the early and late stages of development has been assessed by physical modelling. The treatment of a model of a heterogeneous reservoir with the composition is determined to cause a substantial increase in oil displacement coefficient at either low or high temperatures due to equalisation of filtration flows, an increase in reservoir coverage, and restoration of initial permeability. Investigation of the composition and properties of heavy high-viscosity oil before and after treatment with the composition shows that the application of DES-based acid composition does not affect the qualitative composition of oil. The use of the composition leads mainly to redistribution of the content of low- and high-molecular structures: predominantly light occluded hydrocarbons are displaced, while heavy oil components are adsorbed on the reservoir.

Laboratory modelling of oil pollution of water bodies was carried out using the diesel fuel - water - mineral phase system. The content and composition of organic compounds in each of the parts making up the system were studied by gas chromatography - mass spectrometry. The direction of changes in the composition of n -alkanes, polycyclic aromatic and naphthenic hydrocarbons, cyclohexanes, alkylbenzenes and trimethylalkylbenzenes present in diesel fuel during the transition from diesel fuel to the aqueous and mineral phases has been revealed.

The products of oxidative destruction of asphaltenes of heavy Paleozoic oils from the Ashalcha and Nurlat oilfields differing in the age of host sediments have been studied. It is shown that oxidation of the asphaltenes of both oils by hydrogen peroxide in the presence of acetic acid results in the release of occluded compounds. The compounds identified in their composition include n -alkanes, steranes, hopanes and methyl esters of n -alkane acids. A peculiarity of the asphaltenes of Nurlat oil occurring in the Devonian sediments is the presence of n -alkenes in the composition of occluded compounds. The presence of occluded compounds in the structure of asphaltenes is confirmed by the results of X-ray diffraction.

The ecological state of hard-to-reach oil-producing territories of West Siberia has been studied. Results of the analysis of enhanced vegetation index (EVI) dynamics are presented in order to assess the state of vegetation cover over the territories of hydrocarbon fields of in the Yamal-Nenets Autonomous District using moderate resolution imaging spectroradiometer (MODIS) satellite data. The average EVI values of vegetation over oilfield areas were calculated for full growing seasons from May 25 to September 20, 2013-2022. It has been determined that, on average, EVI values for the entire growing season in 2022 became higher by more than 20 % compared to the data in 2013. The trend to an increase in EVI in the final growing season over the 10-year period under study was identified.

The dynamics of the composition of biomolecules in the leaves of Caragana arborescens and Sorbus aucuparia shrubs, typical of the South taiga natural climatic zone, was studied by gas chromatography - mass spectrometry in the process of post-pyrogenic restoration at the territory near the Golovina village, the Tomsk Region, 3 months, 1 year and 2 years after the fire event. Acyclic organic compounds have been identified: n -alkanes, fatty acids, n -alkane-2-ones, aldehydes, n -alkanols. The long-chain saturated alcohol 10-nonacosanol was found in the leaves of Sorbus aucuparia . Aliphatic diterpenoids phytone and the isomers of phytol, triterpene squalene, as well as naphthenoaromatic compounds vitamin E (tocopherol) and vitamin K1 (phytanodione) were detected among isoprenoid structures in the leaves of S. aucuparia , increased phytol and fatty acid levels are observed in the leaves of S. aucuparia 3 months and 1 year after the fire event, and then the concentrations of these compounds decrease to background values after 2 years. Squalene content in the leaves of S. aucuparia , which decreased as a result of the fire event, increased sharply the following year, and after 2 years, it still remained at a level significantly higher than the background. The fire had the greatest impact on the long-chain alcohol 10-nonacosanol, which was detected in large amounts in the leaves of S. aucuparia . As a result of the fire, there is a drop in its content to trace amounts, followed by a slight increase the following year and an abrupt increase up to background values after 2 years. During the two-year-long post-pyrogenic restoration, changes in the molecular mass distribution of acyclic compounds are observed. The leaves of S. aucuparia, sampled 3 months and the following year after the fire, exhibited a shift from higher molecular homologues to less higher molecular n- alkanes and n- aldehydes in comparison with the leaves from background sites, while the corresponding shift observed in C. arborescens related to n- alkane-2-ones. The distribution of acyclic compounds in the post-pyrogenic area approaches the background level 2 years after the fire.