Analysis of oil temperature distribution over pipeline cross section when pumping is stopped

UDK: 622.692.4.01
DOI: 10.24887/0028-2448-2022-12-144-147
Key words: starting pressure, safe stop time, high-viscosity oil, congealing oil
Authors: A.U. Yakupov (Industrial University of Tyumen, RF, Tyumen), Yu.D. Zemenkov (Industrial University of Tyumen, RF, Tyumen), T.G. Ponomareva (Industrial University of Tyumen, RF, Tyumen), E.L. Chizhevskaya (Industrial University of Tyumen, RF, Tyumen), M.Yu. Zemenkova (Industrial University of Tyumen, RF, Tyumen), S.Yu. Toropov (Industrial University of Tyumen, RF, Tyumen), A.B. Shabarov (Industrial University of Tyumen, RF, Tyumen)

In the pipeline transport of high-viscosity and congealing oil the issue of determining the safe shutdown time, as well as calculating the starting pressure required to resume pumping and bring the main oil pipeline into operation, is of particular relevance. In the process of shutting down the underground laying of an oil pipeline, paraffinic oil cools and crystallizes. At the same time, its rheological properties change, with a temperature decrease viscosity and shear stress increase. The oil temperature and the pressure required to bring the oil pipeline into operation depend on the duration of pumping stop. The pressure value required for start-up may turn out to be higher than the allowable one in a given section of the pipeline. In this regard, it is necessary to monitor the temperature of the oil during the shutdown process. The cooling of oil occurs unevenly both along the cross section and along the length of the pipeline. And the value of the start-up pressure depends on the position of the shear surface, which may be less than the radius of the pipeline. To take into account the temperature non-uniformity over the cross section, this paper solves the problem of conjugate heat transfer between the oil pipeline and the soil surrounding it. The article considers the case of using seasonally operating cooling devices for underground oil pipeline in permafrost soils and these devices influence on the distribution of oil temperature depending on shutdown duration. The results of a numerical study of the change in oil temperature over time under the conditions of installation of seasonally operating cooling devices and in their absence are presented. Using the results of the study, we can set the required pressure to resume pumping.

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