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Abstract <p>The use of thermally insulated lift pipes (ILP) in the design of wells for oil and gas production can significantly reduce the cost of their operation by preventing thawing and deformation of wellhead frozen soils. The necessary heat-insulating properties of ILP are obtained as a result of heating up to 400°C with simultaneous vacuuming of their sealed annular space. In order to improve the quality of ILP and reduce operating costs for their heat treatment, an aerodynamic scheme was developed and a calculated analysis of the heating of pipes with a one-way supply of coolant was carried out. The calculation was carried out using the zone two-dimensional method, which makes it possible to study the basic regularities of heat treatment of pipes. On the example of an internal composite pipe with a diameter of 73 mm, a wall thickness of 5.5 mm and a length of 12 m, heating schedules, changes in the temperature of the coolant (air), as well as the distribution of heat flows are determined. As a result of the calculations, it turned out that there is an uneven distribution of these parameters both along the length of the pipe and over time. The time of heating the pipe to a temperature of 390–400°C along the entire length is approximately 120 min. The temperature difference between the inlet and outlet ends of the pipe as a massive body reaches 230°C during the heating period of 10–30 min at the speed of the coolant movement of 18 m/s. The maximum value of the heat flow is observed at the inlet of the pipe in the initial heating period and is 2160 W. On average, the heat flow during the period of heating the pipe is 220 W. The results obtained can be used in the design of installations for heating and cooling of ILP during vacuuming.</p>

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Development of the Aerodynamic Scheme of the Installation for Heating Thermally Insulated Lift Pipes during Evacuation with One-Way Supply of Coolant

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • M. V. Kalganov,
  • L. A. Zainullin,
  • N. A. Spirin

摘要

Abstract

The use of thermally insulated lift pipes (ILP) in the design of wells for oil and gas production can significantly reduce the cost of their operation by preventing thawing and deformation of wellhead frozen soils. The necessary heat-insulating properties of ILP are obtained as a result of heating up to 400°C with simultaneous vacuuming of their sealed annular space. In order to improve the quality of ILP and reduce operating costs for their heat treatment, an aerodynamic scheme was developed and a calculated analysis of the heating of pipes with a one-way supply of coolant was carried out. The calculation was carried out using the zone two-dimensional method, which makes it possible to study the basic regularities of heat treatment of pipes. On the example of an internal composite pipe with a diameter of 73 mm, a wall thickness of 5.5 mm and a length of 12 m, heating schedules, changes in the temperature of the coolant (air), as well as the distribution of heat flows are determined. As a result of the calculations, it turned out that there is an uneven distribution of these parameters both along the length of the pipe and over time. The time of heating the pipe to a temperature of 390–400°C along the entire length is approximately 120 min. The temperature difference between the inlet and outlet ends of the pipe as a massive body reaches 230°C during the heating period of 10–30 min at the speed of the coolant movement of 18 m/s. The maximum value of the heat flow is observed at the inlet of the pipe in the initial heating period and is 2160 W. On average, the heat flow during the period of heating the pipe is 220 W. The results obtained can be used in the design of installations for heating and cooling of ILP during vacuuming.