Insulated oil pipe and preparation method thereof

Abstract

The invention discloses an insulated oil pipe. The insulated oil pipe comprises an oil pipe base body. A ceramic glaze is arranged on the inner surface of the oil pipe base body. An insulating layer is arranged on the outer surface of the oil pipe base body. A protective layer is arranged on the outer surface of the insulating layer. An anticorrosion layer is arranged on the surface of the protective layer. The insulated oil pipe has the beneficial effects that the inner wall is smooth, the friction force generated when oil flows can be greatly reduced, the weight is low, the insulating effect and the anticorrosion effect are both good, the service life is long, no energy needs to be additionally consumed during use, and the cost performance is high.

Description

technical field [0001] The invention relates to the field of pipelines, in particular to a thermal insulation oil pipe and a preparation method thereof. Background technique [0002] At present, regardless of the oil recovery methods used in major oilfields in China, the temperature of the oil drops greatly while the viscosity increases during the process of the oil from the oil layer to the ground. In addition to the oil outlet temperature, when the crude oil rises from the underground oil layer to the surface, the temperature of the crude oil is basically slightly higher than the formation temperature at the same position, from 55-130°C in the oil layer to 15-30°C. Smaller, during production in winter, the temperature of the oil when it reaches the surface wellhead is only 15°C to 20°C, which is far below the freezing point (the freezing point of crude oil is generally 30°C to 38°C), and the viscosity of crude oil in the underground oil layer (thin oil) Generally, it is 4...

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Problems solved by technology

[0002] At present, regardless of the oil recovery methods used in major oilfields in China, the temperature of the oil drops greatly while the viscosity increases during the process of the oil from the oil layer to the ground. In addition to the oil outlet temperature, when the crude oil rises from the underground oil layer to the surface, the temperature of the crude oil is basically slightly higher than the formation temperature at the same position, from 55-130°C in the oil layer to 15-30°C. Smaller, during production in winter, the temperature of the oil when it reaches the surface wellhead is only 15°C to 20°C, which is far below the freezing point (the freezing point of crude oil is generally 30°C to 38°C), and the viscosity of crude oil in the underground oil layer (thin oil) Generally, it is 4-5mpa.s (close to the viscosity of edible salad oil). From this point of view, the viscosity of crude oil increases several times during the lifting process in the oil pipe. In many cases, the viscosity of the oil to the ground is the viscosity when it is in the oil layer. 9 times more than that of the oil, and the decrease of the oil temperature leads to the increase of the viscosity, which increases the frictional resistance of the oil in the pipeline. Therefore, a greater power consumption of the pumping machine is required to maintain the production. Moreover, the increase of the viscosity directly leads to the increase of the oil The flow resistance of oil increases, and when the oil reaches the ground, the fluidity has deteriorated, and hot water is often required for transportation, resulting in waste of resources and collection and transportation costs

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