Vacuum composite heat-insulating pipeline connecting structure

Abstract

The invention discloses a vacuum composite heat-insulating pipeline connecting structure, which comprises vacuum composite heat-insulating pipes, a coupler and a gland bush, wherein the coupler is a tubular structure; the two ends of an inner hole of the coupler are provided with threaded tapered holes respectively of which outer ends are greater while inner ends are smaller and which are connected with connecting parts of the two adjacent vacuum composite heat-insulating pipes respectively; the outer surface of the connecting part of the vacuum composite heat-insulating pipe is a threaded tapered surface matched with the threaded tapered hole at any end of the inner hole of the coupler; the end face of the vacuum composite heat-insulating pipe is provided with at least one circle of groove along a circumferential direction; and the gland bush is arranged in the groove between the end faces of the two vacuum composite heat-insulating pipes. The vacuum composite heat-insulating pipeline connecting structure can greatly improve heat-insulating property at junctions of the pipeline, prolong the heat-insulating service life of the pipeline, reduce the number of pipeline connecting parts and simplify the assembly process of the pipeline connecting parts, and is especially applied to the coupling of underground oil pipes for steam injection and oil extraction.

Description

Technical field [0001] The invention relates to oil pipes, in particular to a vacuum composite heat insulation pipe connection structure, which is suitable for the connection of heat preservation liquid and gas transportation pipes, and is particularly suitable for the connection of downhole oil pipes for steam injection and oil extraction of heavy oil. Background technique [0002] The currently used tubing is generally installed in the well of several thousand meters. Due to the depth of the well, the thick oil, the large temperature difference in downhole heat transfer, and the small thermal resistance of the steel pipe, the heavy oil in the tubing loses heat during the process of transporting the heavy oil from downhole to the ground Therefore, this kind of oil pipe and coupling must adopt heat-insulating oil pipe and heat-insulating coupling with superior heat insulation performance. With the continuous development of thermal insulation technology, the thermal insulation per...

AI Technical Summary

Problems solved by technology

With the continuous development of heat insulation technology, the heat insulation performance of the oil pipe has been greatly improved, but the heat insulation problem of the oil pipe coupling has not been well solved, and the heat loss of the oil pipe coupling accounts for the heat loss in the oil pipe pipeline. The proportion is getting bigger and bigger

Although this patent can achieve a certain heat insulation effect, its heat insulation effect is determined by the heat insulation bushing, and the heat insulation bush is easy to age, and the heat insulation performance is not very good. Therefore, the patented oil pipe coupling The heat insulation effect is not ideal, and the heat insulation effect is difficult to maintain for a long time

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