Durable composite pipe for conveying oil gas

Abstract

The utility model discloses a durable composite pipe for transmitting oil and gas, which comprises an inner lining layer, an outer lining layer and an outer lining layer, the lining layer structurally comprises polyethylene layers and an alloy framework, and the alloy framework is embedded between the polyethylene layers; the alloy skeleton structure comprises a plurality of overlapped wave-shaped alloy rings, each wave-shaped alloy ring is provided with wave crests and wave troughs which are alternately arranged, every two adjacent wave-shaped alloy rings are fixedly connected, and the wave crests of one wave-shaped alloy ring right face the wave troughs of the other wave-shaped alloy ring. The inner protection layer is arranged on the surface of the outer layer of the inner lining layer; the reinforcing layer is arranged on the surface of the outer layer of the inner protective layer; the outer barrier layer is arranged on the surface of the outer layer of the reinforcing layer. The pressure-bearing and tensile capacity of the composite pipe is optimized, meanwhile, the inner pipe layer is structurally reinforced, the pressure-bearing strength difference of the inner pipe layer and the outer pipe layer is reduced, and the overall structure of the composite pipe is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas transmission pipelines, and particularly relates to a durable composite pipe for transmitting oil and gas. Background Art

[0002] In the process of oil and gas acquisition and transmission in subsea and downhole engineering, in order to ensure the efficiency and safety of oil and gas transmission, metal pipes are usually used for traditional oil and gas transmission. At present, as an upgraded product of steel pipes, fiber composite pipes have the properties of corrosion resistance, high temperature resistance and high pressure resistance, and are used in more and more oilfield exploitations. At present, the vast majority of composite pipes adopt plastic polymers as the inner and outer pipe layers, and at the same time adopt metal or non-metal as the reinforcing layer structure. This kind of composite pipe composed of multiple-layer structures has obvious advantages in the transmission of related substances of oil and gas. Therefore, such composite pipes are widely used in subsea oil and gas transmission. However, the current layer structure of composite pipes has limitations, so there is still room for optimization in the pressure-bearing capacity and tensile strength of composite pipes.

[0003] In view of this problem, such as application number: CN202122234793.1, a composite pipe with strong pressure-bearing capacity and high tensile strength, but there is a lack of a structure for effectively supporting the inner lining layer inside the pipe layer, resulting in a difference in pressure-bearing capacity between the inside of the pipe layer and the fiberglass layer and the armor layer near the outside of the pipe layer, leading to relatively unstable composite pipe structure and pressure-bearing capacity. Summary of the Utility Model

[0004] An object of the utility model is to solve at least the above problems and / or defects, and provide at least the advantages described hereinafter.

[0005] In order to achieve these objects and other advantages of the utility model, there is provided a durable composite pipe for transmitting oil and gas, comprising:

[0006] An anti-corrosion layer, with an inner lining layer arranged outside it;

[0007] The structure of the inner lining layer includes:

[0008] A polyethylene layer and an alloy skeleton, and the alloy skeleton is embedded between the polyethylene layers;

[0009] The alloy skeleton structure includes:

[0010] Multiple overlapping corrugated alloy rings, with multiple alternately arranged wave crests and wave troughs provided on each single corrugated alloy ring, fixedly connected between adjacent two corrugated alloy rings, and the wave crest of one corrugated alloy ring facing the wave trough of another corrugated alloy ring;

[0011] An inner protective layer, arranged on the outer surface of the inner lining layer;

[0012] Reinforcement layer, which is arranged on the outer surface of the inner protective layer;

[0013] Outer barrier layer, which is arranged on the outer surface of the reinforcement layer.

[0014] Preferably, the fixed connection method of the corrugated alloy ring is welding connection at the intersection of adjacent corrugated alloy rings.

[0015] Preferably, an adhesive layer is laid on the surface of the corrugated alloy ring of the alloy skeleton, and the alloy skeleton is fixed between the polyethylene layers through the adhesive layer.

[0016] Preferably, the inner protective layer includes:

[0017] Antistatic layer, which is arranged on the outer surface of the polyethylene layer;

[0018] Heat insulation layer, which is arranged on the outer surface of the antistatic layer.

[0019] Preferably, the reinforcement layer includes:

[0020] Carbon fiber layer, which is arranged on the outer surface of the heat insulation layer; a plurality of equidistant limiting strips are axially arranged on the outer surface of the carbon fiber layer;

[0021] Wear-resistant layer, which is arranged on the outer surface of the carbon fiber layer, and limiting grooves matching the positions of the limiting strips are arranged on the inner layer of the carbon fiber layer.

[0022] Preferably, the outer barrier layer includes:

[0023] Anti-permeation layer, which is arranged on the outer surface of the wear-resistant layer, and grooves corresponding to the limiting grooves on the surface of the wear-resistant layer are arranged on the anti-permeation layer;

[0024] Anti-corrosion layer, which is arranged on the outer surface of the anti-permeation layer.

[0025] The utility model has at least the following beneficial effects:

[0026] The utility model re-sets the structure on the composite pipe, and adds an alloy skeleton to the inner layer of the inner lining layer on the basis of the reinforcement layer of the composite pipe. The alloy skeleton and the reinforcement layer are respectively placed in the inner part and the outer part of the composite pipe. Through the above structural design, not only the overall pressure-bearing and tensile capacity of the composite pipe is enhanced, but also the pressure difference between the inner and outer layers of the composite pipe is reduced, making the overall structure of the composite pipe more stable.

[0027] Other advantages, objectives and features of the utility model will be partially reflected by the following description, and partially will be understood by those skilled in the art through the research and practice of the utility model. Description of the drawings

[0028] Figure 1 A durable composite pipe for transporting oil and gas according to the present utility model.

[0029] Figure 2 A local-level stretching effect diagram of the present utility model is shown.

[0030] Figure 3 A diagram of a single waveform alloy ring.

[0031] Figure 4 A partial enlarged view of the alloy skeleton. Specific implementation manners

[0032] The following further describes the present utility model in detail with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description in the specification. It should be understood that the terms such as "having", "comprising", and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations. It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection, can be a mechanical connection, can be an electrical connection, can be directly connected, or can be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, in the present utility model, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature has a lower horizontal height than the second feature.

[0033] As Figures 1 to 4 shown, a durable composite pipe for transporting oil and gas includes:

[0034] An anti-corrosion layer 11, with a lining layer 1 provided on its outer side;

[0035] The structure of the inner liner layer 1 includes: a polyethylene layer 2 and an alloy skeleton 3, and the alloy skeleton 3 is embedded between the polyethylene layers 2;

[0036] The structure of the alloy skeleton 3 includes:

[0037] A plurality of overlapping corrugated alloy rings 31, and a plurality of alternately arranged wave crests 3-1 and wave troughs 3-2 are provided on the single corrugated alloy ring 31. Adjacent two corrugated alloy rings 31 are fixedly connected, and the wave crest of one corrugated alloy ring 31 faces the wave trough of another corrugated alloy ring;

[0038] An inner protective layer 4, which is arranged on the outer surface of the inner liner layer 1;

[0039] A strengthening layer 9, which is arranged on the outer surface of the inner protective layer 4;

[0040] An outer barrier layer 14, which is arranged on the outer surface of the strengthening layer 9.

[0041] Working principle: The composite pipe is successively provided with an anti-corrosion layer 11, an inner liner layer 1, an inner protective layer 4, a strengthening layer 9, and an outer barrier layer 14 from the inside to the outside. An alloy skeleton 3 is arranged between the polyethylene layers 2 of the polyethylene pipe. The alloy skeleton adopts a plurality of overlapping corrugated alloy rings 31 for alternate lamination. Each corrugated alloy ring 31 is equidistantly provided with 8 wave crests 3-1 and 8 wave troughs 3-2. By the wave crest of one corrugated alloy ring 31 facing the wave trough of another corrugated alloy ring 31 between adjacent corrugated alloy rings 31, and at the same time, adjacent alloy corrugated rings 31 are fixedly connected, the circumferential pipe body of the inner liner layer 1 is simultaneously supported by 16 wave crests of the alloy skeleton 3, greatly enhancing the overall structural stability and pressure-bearing capacity of the composite pipe. At the same time, when the composite pipe is subjected to forces at different angles, the wave crests of the corrugated alloy rings 31 will undergo appropriate bending deformation, so as to absorb part of the impact force to further reduce the impact force received by the inner liner layer 1.

[0042] A strengthening layer 9 is arranged near the outer layer of the composite pipe to further strengthen the pressure-bearing and tensile resistance capabilities of the composite pipe. While the strengthening layer 9 improves the overall pressure-bearing and tensile resistance capabilities of the composite pipe, the alloy skeleton 3 reduces the pressure difference between the inner liner layer 1 and the strengthening layer 9 when the composite pipe is stressed, making the overall pressure-bearing effect of the composite pipe better.

[0043] The anti-corrosion layer 11 prevents the substances transported inside the composite pipe from corroding the inner surface of the inner liner layer 1. An inner protective layer 4 is arranged between the inner liner layer 1 and the strengthening layer 9 to protect the inner liner layer 1 from the influence of the composite pipe body itself and external factors. An outer barrier layer 14 is arranged on the outer layer of the strengthening layer 9 to block the influence of external factors on the composite pipe.

[0044] In the above solution, the fixed connection method of the corrugated alloy ring 31 is:

[0045] The intersections of the adjacent corrugated alloy rings 31 are connected by welding. Through the above settings, the structural stability of the alloy skeleton 3 is enhanced.

[0046] In the above solution, an adhesive layer is provided on the surface of the corrugated alloy ring 31 of the alloy skeleton 3, and the alloy skeleton 3 is fixed between the polyethylene layers 2 through the adhesive layer. By providing the adhesive layer, the situation where the alloy skeleton loosens between the polyethylene layers 2 due to external force impact is avoided.

[0047] In the above solution, the inner protective layer 4 includes:

[0048] An anti-static layer 5, which is provided on the outer surface of the outer layer of the polyethylene layer 2;

[0049] A heat-insulating layer 6, which is provided on the outer surface of the outer layer of the anti-static layer 5.

[0050] By sequentially providing the anti-static layer 5 and the heat-insulating layer 6 on the outer layer of the inner lining layer 1, the generation of static electricity in the composite pipe body is avoided, and at the same time, the heat-insulating layer 6 plays a role in isolating the influence of low temperature and high temperature on the substances in the pipe. Through the above settings, the safety during the transmission of the composite pipe is improved.

[0051] In the above solution, the reinforcing layer 9 includes:

[0052] A carbon fiber layer 7, which is provided on the outer surface of the outer layer of the heat-insulating layer 6, and a plurality of equidistant limiting strips 10 are axially provided on the outer surface of the carbon fiber layer 7;

[0053] A pressure-bearing layer 8, which is provided on the outer surface of the outer layer of the carbon fiber layer 7, and limiting grooves 15 are provided at positions corresponding to the limiting strips 10 on the inner layer of the carbon fiber layer 7.

[0054] By sequentially providing the carbon fiber layer 7 and the pressure-bearing layer 8 outside the inner protective layer 4, the tensile and pressure-bearing capabilities of the outer layer of the composite pipe are improved. At the same time, through the engagement of the limiting strips 10 on the carbon fiber layer 7 with the limiting grooves 15 of the wear-resistant layer 8, the anti-radial torsion force of the reinforcing layer 9 of the composite pipe is improved, preventing the outer part of the composite pipe from being impacted and undergoing radial torsion, resulting in delamination of the reinforcing layer 9, thereby avoiding the weakening of the overall compressive and tensile effects of the reinforcing layer 9.

[0055] In the above solution, the outer barrier layer 14 includes:

[0056] An anti-permeation layer 12, which is provided on the outer surface of the outer layer of the pressure-bearing layer 8, and the anti-permeation layer 12 is provided with grooves corresponding to the limiting grooves 15 on the surface of the pressure-bearing layer 8;

[0057] An anti-corrosion layer 13, which is provided on the outer surface of the outer layer of the anti-permeation layer 12.

[0058] An anti-seepage layer 12 and an anti-corrosion layer 13 are sequentially arranged on the outer surface of the pressure-bearing layer 8. The anti-seepage layer 12 prevents the penetration of external chemical substances into the composite pipe layer body, and the anti-corrosion layer 13 enables the overall composite pipe to be free from corrosion by external substances. The anti-seepage layer 12 is fitted into the limiting groove on the pressure-bearing layer 8 through the groove, so that the outer protective layer will not be delaminated from the strengthening layer after being subjected to external force. Through the above structural design, the external and overall structural stability of the composite pipe is enhanced.

[0059] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A durable composite pipe for transporting oil and gas, characterized in that, Comprising: An anti-corrosion layer, with an inner lining layer provided on its exterior; The structure of the inner lining layer includes: A polyethylene layer and an alloy skeleton, and the alloy skeleton is embedded between the polyethylene layers; The structure of the alloy skeleton includes: A plurality of overlapping corrugated alloy rings, on each single corrugated alloy ring there are a plurality of alternately arranged wave crests and wave troughs, adjacent two corrugated alloy rings are fixedly connected, and the wave crest of one corrugated alloy ring faces the wave trough of another corrugated alloy ring; An inner protective layer, which is provided on the outer surface of the inner lining layer; A strengthening layer, which is provided on the outer surface of the inner protective layer; An outer barrier layer, which is provided on the outer surface of the strengthening layer.

2. The durable composite pipe for transporting oil and gas as described in claim 1, wherein, The fixed connection method of the corrugated alloy ring is: Welding connection is performed at the intersection of the adjacent corrugated alloy rings.

3. The durable composite pipe for conveying oil and gas as described in claim 1, characterized in that, A glue layer is laid on the surface of the corrugated alloy ring of the alloy skeleton, and the alloy skeleton is fixed between the polyethylene layers through the glue layer.

4. The durable composite pipe for transporting oil and gas as described in claim 1, wherein, The inner protective layer includes: An anti-static layer, which is provided on the outer surface of the polyethylene layer; A heat-insulating layer, which is provided on the outer surface of the anti-static layer.

5. The durable composite pipe for transporting oil and gas as described in claim 1, characterized in that, The strengthening layer includes: A carbon fiber layer, which is provided on the outer surface of the heat-insulating layer; a plurality of equally spaced limiting strips are axially provided on the outer surface of the carbon fiber layer; A wear-resistant layer, which is provided on the outer surface of the carbon fiber layer, and limiting grooves are correspondingly provided at the positions of the limiting strips on the inner layer of the carbon fiber layer.

6. The durable composite pipe for transmitting oil and gas as described in claim 1, characterized in that, The outer barrier layer includes: An anti-permeation layer, which is provided on the outer surface of the wear-resistant layer, and grooves corresponding to the limiting grooves on the surface of the wear-resistant layer are provided on the anti-permeation layer; An anti-corrosion layer, which is provided on the outer surface of the anti-permeation layer.

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