Vacuum oil tubing coupling

Abstract

The invention relates to a vacuum oil tubing coupling which comprises a coupling body and an outer sleeve, wherein the coupling body is cylindrical, conical holes which are large outside and small inside are arranged at two ends of the inner surface of the coupling body, and screw threads are arranged on the inner surface of each conical hole, wherein the outer sleeve is sleeved on the outer surface of the coupling body, and a closed vacuum layer is arranged between the outer surface of the coupling body and the inner surface of the outer sleeve. In the invention, the outer sleeve is sleeved on the outer surface of the coupling body, and a clearance between the coupling body and the outer sleeve forms the closed vacuum layer, therefore, the thermal insulation property of the vacuum oil tubing coupling is enhanced; when the coupling is used, two vacuum composite heat-insulation pipes are respectively screwed into threaded conical holes at two ends of an inner hole of the coupling, and the threaded conical holes enhance the sealing property between the coupling and the vacuum composite heat-insulation pipes. In addition, the coupling has the advantages of simple structure, low production cost and long service life.

Description

technical field [0001] The invention relates to the technical field of oil pipelines, in particular to a vacuum oil pipe coupling. technical background [0002] The oil pipes currently used generally work thousands of meters underground. Due to the depth of the well, the thick oil, the large temperature difference of heat transfer in the downhole, and the small thermal resistance of the steel pipe, the heat loss is large when the heating steam is transported downhole through the oil pipe. The heat loss when transporting heavy oil from downhole to the surface is also very large. The low thermal insulation performance of oil pipes and couplings is the main cause of the above problems. Therefore, such oil pipes and couplings must use heat-insulated oil pipes and heat-insulated couplings with superior heat insulation performance. With the continuous development of heat insulation technology, the heat insulation performance of the heat-insulated oil pipe has been greatly improve...

AI Technical Summary

Problems solved by technology

[0002] The oil pipes currently used generally work thousands of meters underground. Due to the depth of the well, the thick oil, the large temperature difference of heat transfer in the downhole, and the small thermal resistance of the steel pipe, the heat loss is large when the heating steam is transported downhole through the oil pipe. The heat loss when transporting heavy oil from downhole to the surface is also very large

The low thermal insulation performance of oil pipes and couplings is the main cause of the above problems. Therefore, such oil pipes and couplings must use heat-insulated oil pipes and heat-insulated couplings with excellent heat insulation performance.

With the continuous development of heat insulation technology, the heat insulation performance of the heat-insulated oil pipe has been greatly improved, but the heat insulation problem of the vacuum oil pipe coupling has not been well solved. The proportion of heat loss in the medium is increasing

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 vacuum oil pipe connection The heat insulation effect of the hoop is not ideal, and the heat insulation effect is difficult to maintain for a long time

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