The article provides а retrospective analysis of the emergence of prerequisites for the creation of designs of universal pumping units: from the first patents registered in the 1940s to modern technical solutions used at industrial facilities. The possibility of industrial application in the oil industry of fundamentally new types of vane pumps with а combined design of the impeller and rotor or the electric motor, which received а recent impetus to their spread with the development of electric motor technologies, is considered. The fundamental difference between these types or pump is the transmission of the torque to the impeller not through the shaft. but through the rim or the wheel, which is also the rotor of the eclectic motor. The absence or а shaft provides а number of advantages, in particular, it leads to an increase in suction capacity, an increase in pressure characteristics and an increase in operational properties -all this together increases the scope or industrial application of new types or pumps. One of the potential applications of а compact pump of the horizontal type can be the rocking to а frozen oil pipeline by tapping the coil at special points of the pipeline route. From the point of view to transporting high-velocity oil, the design of this type also looks promising; in addition, the possibly of influencing the transported medium by an electromagnetic field is noted. The possibility or using removable impellers of various types for а hollow pump-electric motor is considered, which can significantly increase the scope or application of new types of pumps.
The article analyzes the modern theory and practice of pipeline transport of bituminous oil together with low-viscosity solvent. In addition, a detailed analysis of the rheological models of non-Newtonian fluids is carried out, which establishes a number of assumptions on the rheology model selection algorithm currently in use (limited number of rheological models, variability in model coefficient assignment, etc.). Ways of their elimination are proposed. Dependencies for determination of the dynamic viscosity coefficient of binary oil mixtures are investigated. Calculation of the parameters of the bituminous oil mixture with solvent is considered. Complex experimental studies on rheology mixture models of bituminous oil and solvent on the example of the Ashalchinsky field (Russia, Tatarstan) in a wide range of temperatures and concentrations of the solvent are conducted. A two-dimensional field of rheological models of the oil mixture is constructed, which makes it possible to determine the rheological model of the pumped oil mixture depending on the solvent concentration and the temperature of the mixture. Formulas for forecasting the rheological properties of the oil mixture on the basis of statistical processing of the results of experimental studies are theoretically substantiated. It is proven that the viscosity of binary oil mixtures in the Newtonian fluid field should be determined by a modified Arrhenius equation. The proposed models with a high degree of accuracy describe the rheological properties of the oil mixture. It is shown that in the case of complex mixtures, not one rheological model should be applied, but their hierarchy should be established depending on the solvent concentration and temperature.
The necessity of using the controlled heat treatment technology of oil instead of «hot pumping» is substantiated. A number of advantages of the “cold” transportation of oil are presented, as well as the main tasks that need to be solved for the successful usage of the above technology at the trunk oil pipelines. The main drawbacks of the heat exchanging equipment used at the heating and pumping stations of trunk pipelines for non-Newtonian solidifying waxy oils. Particular attention is paid to deposition and accumulation of wax in the flowing part of the equipment as well as the possibility of their safe quickly cleaning. The use of domestic twisted steel heat exchangers based on small radius bent tube is proposed. Constructive advantages of the proposed twisted heat exchangers are compared with the traditionally used equipment - shell-and-tube exchangers with horizontal and U-shaped arrangement of pipes, fully-welded plate heat exchangers, as well as finning air cooling units. For comparison, such technical and economic indicators as heat transfer rate, per surface area of heat exchange, complexity of operation, maintenance and repair, reliability and structural strength under cyclic loads in difficult thermobaric conditions are adopted. The issues of using twisted steel heat exchangers based on small radius bent tubes at trunk pipelines objects are considered taking into account successful experience of application in other industries.
Представлен исторический обзор становления технологии последовательной перекачки различающихся по качеству нефтепродуктов. Приведены предпосылки появления технологии, описаны первые экспериментальные исследования в этой области на трубопроводах в России и США. Показаны противоречивые результаты опытов по определению количества смеси, образующейся при последовательной перекачке разносортных нефтепродуктов методом прямого контактирования. Указано, что неоднозначные практические данные не позволяли достоверно оценивать и прогнозировать объем смеси и ее протяженность, для решения этих задач в сложившихся условиях необходимым являлось теоретическое обоснование процесса смесеобразования на границе контакта двух сред. Показано развитие теории последовательной перекачки: от упрощенной модели механического смешения жидкостей, предложенной в 1938 году В. С. Яблонским, до конвективно-диффузионной теории смешения, сформулированной в 1954 году Тейлором и ставшей основополагающей для дальнейших исследований. Отмечено, что активное внедрение последовательной перекачки в производство началось с конца 1940-х годов. В настоящее время это широко распространенная и используемая на крупнейших трубопроводах мира технология транспортирования, совершенствование которой в части теории и учета практических аспектов эксплуатации трубопроводов активно продолжается сегодня. A historical overview of the evolvement of the technology of different quality oil products batching is presented. The prerequisites for the emergence of this technology are given, and the first experimental studies in this area on operating pipelines in Russia and the USA are described. The contradictory results of the experiments on quantification of the mixture formed during the diverse oil products batching by direct contact are shown. It is indicated that the ambiguous practical data did not allow to reliably estimate and predict the batch volume and its extent. To solve these problems in the prevailing conditions, a theoretical justification of the mixture formation process at the two-medium contact boundary was necessary. The development of the theory of batching is shown: from the simplified model of mechanical mixing of liquids, proposed in 1938 by V. S. Yablonsky, to the fundamental diffusion theory of mixing, formulated in 1954 by Taylor, which became the basis for further research. It is noted that the active introduction of batching into production began in the late 1940s. It is now a widespread and widely used transportation technology used on the world’s largest pipelines, the improvement of which in terms of the theory and consideration of practical aspects of the pipeline operation is actively continuing today.
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