As already mentioned, in the processes of extraction, storage and transportation of oils, they mix with each other or with water, which leads to changes in their rheological and physicochemical properties. The oils entering the refining and transportation stages are subject to strict requirements in terms of the amount of water, sulfur, chlorine salts and mechanical impurities in a number of indicators that determine their quality characteristics. Different types of oils have different qualities depending on the density and percentage of sulfur. It is these indicators that greatly affect the quality of oil and its selling price. High-viscosity oils with high density are usually not supplied to terminals and general purpose pipelines. To transport such oils, better quality, lighter oil or gas condensate is added to them. Oils with a high percentage of sulfur should also be refined or mixed with light oil or condensate. Mixing of different quality commercial oils can occur both in terminals and in transportation systems. The analysis shows that the quality of the mixture obtained is very different from the quality of the mixed oils. Given very little study of how the mixing of different types of liquefied oils affects their rheological, physicochemical properties and quality indicators, rotoviscosimetric rheological studies and physicochemical analyzes were performed in the laboratory for different mixtures of rheological complex oils and wetting rates. Mixing of different types of oil usually occurs when there are not enough tanks in the fields where acceptance operations take place. Sometimes different oils are injected into the same jaw in sequence and separately, without accounting. In such cases, the measurements made on the oil at the receiving points are different from the calculated price. Information on quality indicators of crude oils and their mixtures produced in mines (density, viscosity, freezing point, mechanical mixtures, chlorine salts, asphaltene, paraffin, amount of resins, etc.) It is also important for forecasting the operating modes of stations. In the existing normative documents and literature, as a rule, the definition of the main quality indicators of oils and their mixtures is based on established rules and dependencies. The study of the effect of mixing of different types of heterogeneous oils of Azerbaijan on their rheological and physical-chemical properties shows that the additive rule can lead to serious errors in the process of determining the predicted parameters, as many properties of complex oil mixtures are taken from calculations for ideal mixtures. Laboratory studies were conducted for individual oil samples, their different mixtures and degree of dehydration, oil and condensate, as well as mixtures of various types of light petroleum products, and the experimental results were analyzed. In the laboratory, the effect of the degree of dehydration of high-viscosity heavy oils taken from wells 43 (0%), 28 (15%), 37 (40%) and the storage tank of the "Jafarli" field of the "Muradkhanli" IPC on their rheological properties was studied. has been. All of the studied oils are high-viscosity, heavy oils and differ in the amount of water, mechanical impurities and chlorine salts they contain. Thus, the oil of well No. 43 was without water, and the oil of wells No. 28 and 37 had a water content of 15 and 40%, respectively. Most mechanical impurities (2.1%) were in well oil No 28, and most chlorine salts were in well oil No 37. Irrigation of the considered oil samples was artificially increased and their rheological parameters (γ ̇ and τ) were determined in the “Reotest-2” viscometer under different conditions at different irrigation levels. The increase in viscosity at small values of the velocity gradient at a certain degree of dehydration of wetting has led to a rapid decrease in the shear stress at large values. It was determined that the maximum value of the degree of dispersion of oils in water or the degree of saturation, indicating the saturation limit, was 70-80%, 40%, and 80% for mixed oil, respectively, for samples taken from wells 28, 37 and 43. Keywords: oil, mixed oil, mechanical mixture, degree of dehydration, rheological parameters.

Studies of the rheological properties of oil during transportation depending on the content of resinous components and on the intensity of asphalten-rezin-parphine deposits (ARPD). Exploitation and development of heavy oil fields requires the use of non-traditional methods of their extraction, collection and transportation by pipeline. The rheological properties of the oil are used as the primary source information for design and operation issues during field development and subsequent pipeline transportation. In practice, chemical, thermal and mechanical methods are often used together to clean the ARPD. In this case, the technological and economic effect is achieved as a result of the complete elimination of ARPD and the acceleration of the process. It is important to follow safety rules when using chemical methods in combination with mechanical and thermal methods. One of the main tasks of rheological research is to determine the relationship between the force acting on the environment under study and the deformation forces that occur under the influence of this force. The results of experimental studies of low-paraffinic and high-paraffinic oils show that the presence in the oil of a dispersed system of asphaltenes and resins can lead to depressant effects. In the process of completing the graduation qualification work were overview of ARPD, mechanism of formation and factors, influencing the formation of ARPD. Detailed description is given existing ARPD control technologies with results of pilot tests at various fields and presented comparative analysis of control methods. The study revealed the most effective technologies for prevention and removal of asphalt-resin-paraffin sediments, as well as proposed improvement of one of the methods combating ARPD. The conclusion concluded on the prospects of application technologies during operation of complicated well stock Azerbaijani. These technologies are useful for fields with high content of asphalt-resin-paraffin substances in oil, which leads to a decrease in production of well products. Effective viscosity and tensile strength were measured in a rotary rheometer REOTEST-2 using a measuring system in accordance with GOST 26581-85. The results of electron microscopic studies of the oil sample extracted from the Balakhani field show that only with the addition of BAF-1 reagent, the asphaltene-resin-paraffin associations are completely dissolved and dissolved in the volume of oil. According to the obtained results, it was found that asphalteno-resinous components are natural depressants that reduce the crystallization temperature of paraffin depending on the type of oil. Difron-4201 and BAF-1 were used in different proportions as additives in the article. BAF-1 and Difron 4201 reagents were added to the 1:1:1 ratio of paraffin-resin-asphaltene mixture in Balakhani heavy oil, respectively, in a 1:1 ratio of Difron 4201 and BAF-1 reagents. As a result of the 1:1 ratio of Difron 4201 and BAF-1 reagents to the mixture, the uniform distribution of parasite-resin-asphaltene asociates was observed, which is one of the main conditions for improving the oil relog. The effect of Difron-4201 and BAF-1 additives on the properties of the oil sample extracted from the higher paraffin Bulla field was studied. Difron-4201 and BAF-1 composites consisting of a 1:1 mixture were found to be more effective among the studied ARD additives, which reduces the freezing temperature of the oil sample in the range of 200-800 kg/ton. The optimal density of Difron-4201 and BAF-1 composites was determined to be 600 kg/ton. Similar studies were conducted on Balakhani heavy and Surakhani oil samples. After exposure of BAF-1 and Difron-4201 to resin-asphaltene-paraffin compounds separated from Bulla and Balakhani oil samples by their additives, their electron microscopic studies were studied. According to the research, it is more expedient to use a composite made of a mixture of reagents BAF-1 and Difron-4201 to improve the rheological properties of paraffin, resin, asphaltene oils. Keywords: viscosity, asphaltene, resin, paraffin, association, additive, Difron-4201, BAF-1.