Aerogel heat insulating oil pipe

Abstract

The invention discloses an aerogel heat insulating oil pipe which comprises an inner pipe and an outer pipe. The inner pipe is sleeved with the outer pipe, and a closed annular heat insulating cavity is formed between the inner pipe and the outer pipe. The annular heat insulating cavity is filled with a heat insulating material, namely aerogel. At least one centering ring is arranged in the annular heat insulating cavity. The two ends of the inner pipe are in a horn shape. The left end of the inner pipe is welded to the inner wall of the left end of the outer pipe, and the right end of the inner pipe is heated and extended according to the designed expansion rate and then welded to the right end of the outer pipe. The annular heat insulating cavity is vacuumized or inflated with inert gas. According to the aerogel heat insulating oil pipe, the aerogel composite material serves as the annular heat insulating cavity, and the annular heat insulating cavity is vacuumized or inflated with the inert gas, so that the heat insulating performance is improved. The heat insulating oil pipe has the characteristics that the heat insulating level is high, and the service life is long.

Description

technical field [0001] The invention relates to a heat-insulating oil pipe, in particular to an airgel heat-insulating oil pipe. Background technique [0002] Insulated tubing is the main tool for thermal wellbore insulation and a key factor affecting the quality of steam injection. The existing heat-insulated oil pipes in China use aluminum foil and glass mesh as the cavity of the heat-insulation ring between the inner and outer pipes to achieve heat insulation and heat preservation. The apparent thermal conductivity is less than 0.02W / (m.℃). However, with the widespread development of the steam flooding process and the increasingly urgent situation of energy saving and efficiency improvement, higher requirements are put forward for the performance and service life of the heat insulating tube. [0003] Airgel is a new type of thermal insulation material, which has the characteristics of low thermal conductivity (0.013~0.025w / (m ℃)), light weight, good waterproof performanc...

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Problems solved by technology

[0003] Airgel is a new type of thermal insulation material, which has the characteristics of low thermal conductivity (0.013~0.025w / (m·℃)), light weight, good waterproof performance, and long service life. Good application results have been achieved in thermal insulation of industrial pipelines and refrigerators, but not many applications in the petroleum industry. At present, good application results have been achieved only in the thermal insulation of ground pipelines, and in the thermal insulation of steam injection wells. no application yet

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