Petroleum pipeline transportation resistance reduction device

Abstract

The invention relates to a petroleum pipeline transportation device with low frictional resistance. The petroleum pipeline transportation device comprises an outer pipeline, a permanent magnet, an inner pipeline, magnetic fluid, a flow channel and a magnetic conductive column. A permanent magnet is arranged in a pipeline interlayer through an outer pipeline and inner pipeline structure, a magnetic field is formed on the inner wall of the inner pipeline according to the permanent magnet Halbach array principle, the gradient of the magnetic field is larger when the magnetic field is closer to the inner wall of the inner pipeline, and magnetic fluid can be attached to the pipe wall under the action of the magnetic field to form a uniform magnetic fluid drag reduction layer; the friction force in the petroleum pipeline transportation process is obviously reduced, the friction loss is reduced, and the transportation efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of low-carbon petroleum exploitation, and in particular relates to a resistance reducing device for petroleum pipeline transportation. Background Art

[0002] There are many problems in the process of oil transportation, including poor transportation fluidity, high transportation energy consumption, low efficiency, pipeline corrosion, pipeline leakage, pipeline blockage and other problems. These problems will not only lead to waste of oil resources, but also may pose a serious threat to the environment and personal safety.

[0003] In order to ensure the safety, efficiency, energy conservation and environmental protection of oil transportation, domestic and foreign scholars have proposed many solutions, including adding drag reducers, gas lubrication, surface smoothing treatment, etc. However, the above methods have problems such as affecting oil quality, complex technology, high cost, and difficulties in injection and monitoring. Summary of the invention

[0004] The purpose of the present invention is to provide a drag reduction device for oil pipeline transportation. The permanent magnet is arranged in the pipeline interlayer through the outer pipeline and the inner pipeline structure, and the permanent magnet Halbach array principle is used to form a magnetic field on the inner wall of the inner pipeline, the closer to the inner wall of the inner pipeline, the greater the magnetic field gradient is. Under the action of the magnetic field, the magnetic fluid will adhere to the pipe wall to form a uniform magnetic fluid drag reduction layer, which significantly reduces the friction force in the oil pipeline transportation process, reduces friction loss, and improves transportation efficiency.

[0005] This patent conducts finite element simulation on a large number of permanent magnet Halbach array pipeline examples, analyzes the simulation results, and proposes a reasonable design scheme for a drag reduction device for oil pipeline transportation.

[0006] The technical scheme of the present invention is as follows: a resistance reduction device for oil pipeline transportation, comprising an outer pipeline, a permanent magnet, an inner pipeline, a magnetic fluid, a flow channel and a magnetic conductive column; characterized in that: the permanent magnet is arranged on the inner wall of the outer pipeline and between the outer wall of the inner pipeline, wherein the arrangement of the permanent magnets adopts a Halbach array, the total number of permanent magnets is 4n, and the permanent magnets are composed of cubes with a side length of not less than 1mm, which are connected end to end and surround the pipe wall for one circle; the outer wall thickness of the outer pipeline is 1-10mm, the wall thickness of the inner pipeline is 0.1-1mm, the inner and outer pipelines are made of non-magnetic conductive materials, and under the action of the permanent magnet, a magnetic field with a larger magnetic field gradient closer to the inner wall of the inner pipeline is generated, thereby the magnetic fluid can be attached to the inner wall of the inner pipeline with a certain thickness under the action of the magnetic field force; the magnetic fluid is made of a base carrier liquid insoluble in oil, thereby the service life of the magnetic fluid can be increased, the remaining space in the inner pipeline is the flow channel through which oil is transported, and the presence of the magnetic fluid can reduce the friction resistance during oil transportation.

[0007] The oil pipeline transportation drag reduction device is characterized in that the gap between the outer pipeline and the inner pipeline is equal to the height of the permanent magnet, and the distance between the inner and outer pipelines is maintained by a magnetic conductive column installed between the permanent magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a two-dimensional structural schematic diagram of a petroleum pipeline transportation drag reduction device proposed by the present invention. The serial numbers and corresponding names in the figure are as follows: 1 outer pipeline, 2 permanent magnet, 3 inner pipeline, 4 magnetic fluid, 5 flow channel and 6 magnetic conductive column.

[0009] Figure 2 It is a three-dimensional structural diagram of the present invention.

[0010] Figure 3 It is a schematic diagram of magnetic field strength of the present invention. DETAILED DESCRIPTION

[0011] The present invention will be further described below in conjunction with the accompanying drawings.

[0012] Depend on Figure 1 and 2 The oil pipeline transportation drag reduction device shown in the figure includes an outer pipeline, a permanent magnet, an inner pipeline, a magnetic fluid, a flow channel and a magnetic column; the characteristic is that the permanent magnet is arranged on the inner wall of the outer pipeline and between the outer wall of the inner pipeline, wherein the permanent magnet is arranged in a Halbach array, the total number of permanent magnets is 4n, the permanent magnets are composed of cubes with a side length of not less than 1mm, connected end to end and wrapped around the pipe wall; the outer wall thickness of the outer pipeline is 1-10mm, the wall thickness of the inner pipeline is 0.1-1mm, the inner and outer pipelines are made of non-magnetic materials, and under the action of the permanent magnet, a magnetic field is generated. Figure 3 As shown, the closer to the inner wall of the inner pipe, the greater the magnetic field gradient is, so that the magnetic fluid can be attached to the inner wall of the inner pipe with a certain thickness under the action of the magnetic field force; the magnetic fluid is made of a base carrier liquid that is insoluble in petroleum, which can increase the service life of the magnetic fluid. The remaining space in the inner pipe is the flow channel through which petroleum is transported. The presence of the magnetic liquid can reduce the friction resistance during petroleum transportation.

[0013] The oil pipeline transportation drag reduction device is characterized in that the gap between the outer pipeline and the inner pipeline is equal to the height of the permanent magnet, and the distance between the inner and outer pipelines is maintained by a magnetic conductive column installed between the permanent magnets.

Claims

1. A drag reduction device for oil pipeline transportation, comprising an outer pipeline (1), a permanent magnet (2), an inner pipeline (3), a magnetic fluid (4), a flow channel (5) and a magnetic conductive column (6); characterized in that: The permanent magnet is arranged on the inner wall of the outer pipe and between the outer wall of the inner pipe, wherein the arrangement of the permanent magnet adopts the Halbach array, the total number of permanent magnets is 4n, and the permanent magnets are composed of cubes with a side length of not less than 1mm, which are connected end to end and surround the pipe wall in one circle; the outer wall thickness of the outer pipe is 1-10mm, and the wall thickness of the inner pipe is 0.1-1mm. The inner and outer pipes are made of non-magnetic conductive materials. Under the action of the permanent magnet, a magnetic field with a larger magnetic field gradient is generated closer to the inner wall of the inner pipe, thereby allowing the magnetic fluid to adhere to the inner wall of the inner pipe with a certain thickness under the action of the magnetic field force; the magnetic fluid is made of a base carrier liquid insoluble in petroleum, thereby increasing the service life of the magnetic fluid, and the remaining space in the inner pipe is a flow channel for petroleum transportation. The presence of the magnetic liquid can reduce the friction resistance during petroleum transportation.

2. The oil pipeline transportation drag reduction device according to claim 1, characterized in that: The size of the gap between the outer pipe (1) and the inner pipe (2) is equal to the height of the permanent magnet, and the distance between the inner and outer pipes is maintained by a magnetic conductive column (6) installed between the permanent magnets.

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