Oil production and refining occupy a large niche in the oil industry of the modern world. Currently, in many oil fields, oil facilities are difficult to extract highly viscous oil with a high content of tar-asphaltene substances. The content of high-molecular components of oil, such as asphaltenes, resins, hydrocarbons, are a serious problem in its production and processing, as they can plug wells and stop production. As a study of oil products, an electron paramagnetic resonance (EPR) method can be proposed with further analysis of the concentration of vanadyl complexes and free radicals.
Paramagnetic centers provide exhaustive information about various changes in the high-molecular components of oil. The structure and characteristics of the system does not affect the number of paramagnetic centers, but with their change it is possible to analyze the result of chemical and thermal effects. At the moment there are a large number of scientific works devoted to the study of oil-dispersed systems (VAT), the role of vanadyls and free radicals (CP), but the exact model of the behavior of the concentration of CP and vanadyl porphyrin complexes in the VAT during thermal destruction has not yet been described. Vanadilporphyrins are stable complexes, so knowing their number in a sample makes it possible to solve some problems of petroleum geology: in assessing the productivity of deposits, in the geological structure, in determining the hydrodynamic connection between the strata, in the stratification of oils, and in solving other problems that may arise during time of search, exploration and development of oil fields.
The main goal of the work was to study the features of the EPR spectra of vanadyl complexes in several liquid fractions of Kungur oil, the concentration dependence of SR and vanadyl complexes on the boiling point of the VAT components. The objects of study in this work are Kungur oil and its temperature fractions. The studies were conducted using a modernized EPR spectrometer (the name “Labrador”). In addition to the main goal, the task was to study the capabilities of the spectrometer and its sensitivity after its modernization. As confirmation of the accuracy of the study, the same experiments were carried out on a highly sensitive X-band spectrometer from the company Bruker Elexsys. The work was performed at the Department of Quantum Electronics and Radio Spectroscopy of the Institute of Physics at KFU.
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