Abstract
Operation of oil pipelines in the frozen soil causes heat exchange between the pipeline and the soil and formation of a melt zone which leads to deformation of pipelines. Terms of construction and operation of oil pipelines are greatly related to their temperature conditions. In this regard it is necessary to know the laws of formation of thawing halos around oil pipelines. Thus, elucidation of laws of formation of thawing halos around oil pipelines and determination of optimal conditions for their installation during construction in areas of permafrost in the north of Tyumen region is a very urgent task. The authors developed an algorithm and a computer program for construction of the temperature field of the frozen soil. Some problems have been solved basing on the obtained dependences and graphs of the dependence were constructed. Research and calculations made on the underground oil pipeline construction allowed the authors to give recommendations aimed at increasing the reliability of oil pipelines.
Highlights
When pumping oil and petroleum products by pipeline laid in the frozen ground their temperature drops as a result of heat exchange
Thermal interaction between the pipeline and the environment depends on a way of laying and a pumping method and affects the capacity of heating and pumping stations
The program is written in the style of a multiple document application (MDI)
Summary
When pumping oil and petroleum products by pipeline laid in the frozen ground their temperature drops as a result of heat exchange. The law of temperature distribution along the length of the pipeline and the heat loss are determined These data are taken into account when determining the throughput capacity, selecting the spacing of pumping and heating stations, calculating pipelines for strength, stability and insulation thickness. When carrying out thermal calculation it is necessary to have data on the thermal properties of the oil and insulation These include: density, heat capacity, thermal conductivity, thermal diffusivity, viscosity. Operating data show significant deviations of the actual observed temperature at the end of the section from the rated one This is due to the fact that the heat of the internal friction which arises when oil moves through the pipeline is not taken into account.
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