Stretch-resistant composite pipe

Abstract

The utility model relates to the technical field of composite pipes and discloses a tensile composite pipe which comprises a plastic core pipe, an axial tensile layer laid on the peripheral wall of the plastic core pipe, a steel pipe protection layer arranged on the radial outer side of the axial tensile layer and an outer protection layer arranged on the peripheral face of the steel pipe protection layer. A cable is arranged in the plastic core pipe, the axial tensile layer comprises fiber bundles, the fiber bundles are laid on the peripheral wall of the plastic core pipe in the axial direction of the plastic core pipe, and the fiber bundles and the plastic core pipe can be combined into a whole. According to the technical scheme, the axial tensile layer is laid on the peripheral wall of the plastic core pipe in the axial direction of the pipe, and the axial tensile layer and the plastic core pipe are combined into a whole, so that the axial tensile capacity of the plastic core pipe is improved; and meanwhile, the steel pipe protection layer is arranged on the radial outer side of the axial tensile layer, so that the tensile capacity, the external pressure resistance and the abrasion resistance of the composite pipe are improved when the composite pipe is connected between the ground oil station and the underground oil pump.

Description

Technical Field

[0001] This utility model relates to the field of composite pipe technology, and specifically to a tensile-resistant composite pipe. Background Technology

[0002] Pipes are commonly used for transporting various media, such as crude oil, natural gas, and drilling fluids during oil and gas extraction and transportation. While traditional steel pipes can meet the basic requirements for fluid transportation to a certain extent, the complexity of the oil and gas extraction environment, such as high temperature, high pressure, and strong corrosion, makes them prone to corrosion, wear, and leakage. Furthermore, traditional steel pipes are heavy, difficult to coil, and inconvenient to transport. To overcome these limitations of traditional steel pipes, composite pipes have emerged. Composite pipes typically employ a composite structure of polymer materials and traditional metal materials, achieving advantages such as strong corrosion resistance, good wear resistance, high pressure resistance, good flexibility, and light weight.

[0003] For example, Chinese patent CN105464629B discloses a submersible diaphragm pump composite material coiled tubing oil production system. This composite material coiled tubing comprises a multi-layered tubing body with hollow channels for crude oil passage. The inner layer is a thermoplastic resin inner layer, the middle layer is a thermoplastic resin fiber structure layer, and the outer layer is a thermoplastic resin outer layer. Power cables and optical fibers extending along the length of the tubing are laid within the thermoplastic resin inner layer. While this composite material coiled tubing achieves the laying of power cables and optical fibers within the thermoplastic resin inner layer, the lack of tensile and compressive strength layers makes it prone to breakage and tearing during operations such as running the composite tubing into the well, changing the wellhead, and altering the oil production layer.

[0004] Chinese patent application CN118163420A discloses a metal-armored coilable non-metallic cable-laying tube and its processing method. This metal-armored coilable non-metallic cable-laying tube comprises, from the inside out, an inner tube, a composite layer, and an armor layer. The inner tube is made of general-purpose plastic or engineering plastic. Multiple capillary tubes, multiple electrical cables, and multiple optical cables are evenly distributed circumferentially within the composite layer. The composite layer and the inner tube are made of the same material. The armor layer has an outer coating. This tube is essentially a two-layer structure: a plastic core tube and a metal armor tube. The electrical cables, optical cables, and capillary tubes are laid within the plastic core tube. The metal armor tube is formed, then welded with a straight seam, and its diameter is reduced to the outer surface of the plastic core tube. The pipe provided in this patent application achieves tensile and compressive strength to a certain extent by utilizing a metal-clad pipe. However, on the one hand, the metal-clad pipe and the plastic core pipe are physically compressed. Although the metal-clad pipe connects the downhole oil pump and the surface oil station, achieving tensile strength for the external connection, delamination is likely to occur between the plastic core pipe and the metal-clad pipe during long-term oil production. After delamination, the plastic core pipe will elongate or even break. Therefore, the overall tensile strength of this pipe is poor. On the other hand, this pipe is not suitable for coiling, especially for small-diameter coiling. Utility Model Content

[0005] The purpose of this invention is to overcome the problem of poor tensile strength of composite pipes in the existing technology.

[0006] To achieve the above objectives, this utility model provides a tensile-resistant composite pipe, comprising: a plastic core tube in which a cable is disposed; an axial tensile layer laid on the outer peripheral wall of the plastic core tube; a steel pipe protective layer disposed on the radially outer side of the axial tensile layer; and an outer protective layer disposed on the outer peripheral surface of the steel pipe protective layer; wherein the axial tensile layer comprises fiber bundles, which are laid on the outer peripheral wall of the plastic core tube along the axial direction, and the fiber bundles can be integrated with the plastic core tube.

[0007] In some embodiments, the fiber bundles are multiple layers, which are sequentially stacked to cover the plastic core tube.

[0008] In some embodiments, the tensile composite pipe provided by the present invention further includes a wrapping layer disposed between the axial tensile layer and the steel pipe protective layer, the wrapping layer comprising a wrapping film spirally wound on the outer peripheral surface of the axial tensile layer.

[0009] In some embodiments, the wrapping films of adjacent spirals are adhered to each other.

[0010] In some embodiments, the tensile composite pipe provided by the present invention further includes a reinforcing layer disposed between the wrapping layer and the steel pipe protective layer, the reinforcing layer comprising a reinforcing strip spirally wound on the radially outer side of the wrapping layer.

[0011] In some embodiments, the tensile composite tube provided by the present invention further includes a plastic outer layer, which is composited on the outer peripheral surface of the wrapping layer, and the reinforcing strip is spirally wound on the outer peripheral surface of the plastic outer layer.

[0012] In some embodiments, the reinforcing strip is spirally wound around the outer peripheral surface of the plastic outer layer along a first direction and a second direction, respectively, wherein the first direction and the second direction are opposite to each other.

[0013] In some embodiments, the tensile composite pipe provided by the present invention further includes a transition layer disposed between the reinforcing layer and the steel pipe protective layer, the transition layer comprising plastic on the outer peripheral surface of the reinforcing layer or fiberglass cloth wrapped around the outer peripheral surface of the reinforcing layer.

[0014] In some embodiments, multiple corrugations are formed on the outer peripheral surface of the steel pipe protective layer.

[0015] In some embodiments, the outer protective layer includes an outer anti-corrosion layer, which is disposed on the outer peripheral surface of the steel pipe protective layer.

[0016] Through the above technical solution, an axial tensile layer is laid on the outer peripheral wall of the plastic core tube. This axial tensile layer, such as fiber bundles, has strong tensile strength. The fiber bundles are laid along the axial direction of the plastic core tube on its outer peripheral wall and are integrated with it, thereby improving the axial tensile strength of the plastic core tube. Simultaneously, a steel pipe protective layer is provided radially outside the axial tensile layer. This steel pipe protective layer also has strong tensile strength and external pressure resistance, improving the tensile strength and external pressure resistance of the composite pipe when connected between the surface oil station and the downhole oil pump. Therefore, the tensile-resistant composite pipe of this invention not only has strong tensile strength when connected between the surface oil station and the downhole oil pump, but also maintains strong tensile strength during long-term use, thanks to the axial tensile layer integrated into the plastic core tube, thus improving the overall tensile performance of the composite pipe. Attached Figure Description

[0017] Figure 1 This is an axial side view of the tensile-resistant composite pipe disclosed in this utility model;

[0018] Figure 2 yes Figure 1 A publicly available radial cross-sectional view of a tensile-resistant composite pipe;

[0019] Figure 3 yes Figure 1 Enlarged view of part A in the middle.

[0020] Explanation of reference numerals in the attached figures

[0021] 1-Power cable; 2-Communication cable; 3-Plastic core tube; 31-Inner core tube layer; 32-Core tube filler layer; 33-Outer core tube layer; 4-Axial tensile layer; 41-First fiber bundle; 42-Second fiber bundle; 43-Third fiber bundle; 5-Wrapping layer; 6-Plastic outer layer; 7-Reinforcing layer; 8-Steel pipe protective layer; 9-Outer anti-corrosion layer; 10-Transition layer. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] In this utility model, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this utility model, the descriptions using terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] This utility model addresses the problem of poor tensile strength in existing composite pipes by providing a tensile-resistant composite pipe, as described above. Figure 1 and Figure 2 As shown, the tensile-resistant composite pipe includes: a plastic core tube 3, an axial tensile layer 4, a steel pipe protective layer 8, and an outer protective layer. A cable is installed inside the plastic core tube 3. The axial tensile layer 4 is laid on the outer peripheral wall of the plastic core tube 3. The steel pipe protective layer 8 is installed radially outside the axial tensile layer 4, and an outer protective layer is provided on the outer peripheral surface of the steel pipe protective layer 8. The axial tensile layer 4 includes fiber bundles, which are laid along the axial direction of the plastic core tube 3 on the outer peripheral wall of the plastic core tube 3. The fiber bundles can be integrated with the plastic core tube 3.

[0028] In the tensile-resistant composite pipe provided by this utility model, an axial tensile layer 4 is laid on the outer peripheral wall of the plastic core pipe 3. The axial tensile layer 4, such as fiber bundles, has strong tensile strength. The fiber bundles are laid on the outer peripheral wall of the plastic core pipe 3 along the axial direction and are integrated with the plastic core pipe 3, thereby improving the axial tensile strength of the plastic core pipe 3. Simultaneously, a steel pipe protective layer 8 is provided radially outside the axial tensile layer 4. The steel pipe protective layer 8 also has strong tensile strength and strong resistance to external pressure, improving the tensile strength and resistance to external pressure of the composite pipe when connected between the surface oil station and the downhole oil pump. Therefore, the tensile-resistant composite pipe of this utility model not only has strong tensile strength when connected between the surface oil station and the downhole oil pump, but also, during long-term use, the plastic core pipe with the axial tensile layer also has strong tensile strength, improving the overall tensile performance of the composite pipe.

[0029] In some embodiments, multiple fiber filaments, such as aramid filaments, are twisted or pre-impregnated into fiber bundles, which are then laid on the outer peripheral wall of the plastic core tube 3, and the fiber bundles have at least one layer. According to one embodiment of the tensile-resistant composite tube of this utility model, see [link to embodiment]. Figures 1-3As shown, the fiber bundle has three layers: a first fiber bundle 41, a second fiber bundle 42, and a third fiber bundle 43. The first fiber bundle 41 is laid on the outer peripheral wall of the plastic core tube 3, the second fiber bundle 42 is laid on the outer peripheral surface of the first fiber bundle 41, and the third fiber bundle 43 is laid on the outer peripheral surface of the second fiber bundle 42. By laying multiple layers of fiber bundles, it is ensured that the fiber bundles cover as much of the outer peripheral wall of the plastic core tube 3 as possible, thereby ensuring the axial tensile strength of the plastic core tube 3 after it is integrated with the fiber bundles. Of course, the fiber bundles can also be two, four, five, etc.

[0030] In some embodiments, fiber bundles are laid on the outer peripheral wall of the plastic core tube 3 and bonded to the outer peripheral surface of the plastic core tube 3 by adhesive or extrusion of molten plastic.

[0031] In some embodiments, refer to Figure 2 As shown, the plastic core tube 3 includes, from the inside out, an inner core tube layer 31, a core tube filler layer 32, and an outer core tube layer 33. The cable is laid on the outer circumferential surface of the inner core tube layer 31. The core tube filler layer 32 is laminated on the outer circumferential surface of the inner core tube layer 31 and is flush with the height of the cable, thus forming a relatively smooth outer circumferential surface. The outer core tube layer 33 is laminated on the outer circumferential surface of the core tube filler layer 32, thus forming the plastic core tube 3. The inner core tube layer 31, the core tube filler layer 32, and the outer core tube layer 33 can be made of the same material, including but not limited to PA, PE-RT II, ​​PP, HDPE, etc.

[0032] In some embodiments, the cable includes a power cable 1 and a communication cable 2, for example, see [reference needed] Figure 1 and Figure 2 As shown, power cable 1 consists of 3 sets of cables. Each set can be a single-strand cable or a combination of multiple strands of cables, depending on the actual working conditions. Communication cables include, for example, one or two 50-ohm coaxial cables or optical fibers.

[0033] In some embodiments, see Figure 1 and Figure 2As shown, the tensile composite pipe provided by this utility model further includes a wrapping layer 5 disposed between the axial tensile layer 4 and the steel pipe protective layer 8. The wrapping layer 5 includes a wrapping film spirally wound on the outer peripheral surface of the axial tensile layer 4. At least one layer of wrapping film is spirally wound on the outer peripheral surface of the axial tensile layer 4. The wrapping film includes, but is not limited to, BOPP, PC, PET film, etc. Adjacent spiral wrapping films are bonded to each other. Specifically, the wrapping film is spirally wound on the outer peripheral surface of the axial tensile layer 4 to form multiple spirals. The wrapping films of any two adjacent spirals can be in contact or the later-wound wrapping film can at least partially cover the earlier-wound wrapping film to ensure that the wrapping layer 5 can completely cover the outer peripheral surface of the axial tensile layer 4 without leaving gaps on the outer peripheral surface of the axial tensile layer 4. Thus, the plastic core tube 3 and the axial tensile layer 4 are integrated to form an integral tube. The wrapping layer 5 covers the outer circumferential surface of the integral tube. The wrapping layer 5 is not bonded to the outer circumferential surface of the integral tube, so that there is a certain relative sliding ability between the integral tube and the functional layer outside the wrapping layer 5, such as the steel pipe protective layer 8. This is beneficial for bending the tensile composite tube of this utility model, and thus facilitates the coiling of the composite tube.

[0034] In some embodiments, refer to Figure 1 and Figure 2 As shown, the tensile-resistant composite pipe provided by this utility model further includes a reinforcing layer 7 disposed between the wrapping layer 5 and the steel pipe protective layer 8. The reinforcing layer 7 includes reinforcing strips spirally wound on the radially outer side of the wrapping layer 5. Reinforcing strips include, but are not limited to, PA pre-impregnated glass fiber tape, aramid tape, polyester tape, steel cord tape, steel fiber tape, thin steel tape, etc. By providing the reinforcing layer 7 on the radially outer side of the wrapping layer 5, the internal pressure resistance of the composite pipe can be improved.

[0035] Further, see Figure 1 and Figure 2 As shown, the tensile composite tube provided by this utility model also includes a plastic outer layer 6, which is laminated to the outer peripheral surface of the wrapping layer 5, and the reinforcing strip is spirally wound on the outer peripheral surface of the plastic outer layer 6. The plastic outer layer 6, such as plastic or rubber, is laminated to the outer peripheral surface of the wrapping layer 5, thereby facilitating the bonding of the reinforcing layer 7 to the wrapping layer 5.

[0036] Furthermore, the reinforcing strip is spirally wound onto the outer peripheral surface of the plastic outer layer 6 along both a first direction and a second direction, with the first and second directions being opposite to each other. For example, according to one embodiment of the tensile composite pipe of this utility model, the reinforcing strip is spirally wound onto the outer peripheral surface of the plastic outer layer 6 along the first direction, while the second direction is spirally wound onto both the outer peripheral surface of the plastic outer layer 6 and the reinforcing strip spirally wound along the first direction, thereby further enhancing the internal pressure resistance of the composite pipe.

[0037] In some embodiments, refer to Figure 1As shown, multiple corrugations are formed on the outer circumferential surface of the steel pipe protective layer 8. Specifically, carbon steel or stainless steel coils can be cut into continuous longitudinal strips according to the coiling direction using a slitting machine. The longitudinal strips are then continuously formed along the width direction using a multi-roll forming machine, for example, a UOE method, to form a steel pipe with a longitudinal butt joint. This steel pipe is then wrapped around the radially outer side of the axial tensile layer 4, for example, by wrapping the steel pipe around the outer circumferential surface of the reinforcing layer 7 or the transition layer 10 described below, and the steel pipe protective layer 8 is completed by welding the butt joint. Afterward, the pipe with the steel pipe protective layer 8 is rolled on the outer circumferential surface of the steel pipe protective layer 8 using a corrugating machine to form multiple corrugations, such as annular corrugations or spiral corrugations. Multiple corrugations are formed on the outer circumferential surface of the steel pipe protective layer 8. On the one hand, this makes the obtained tensile-resistant composite pipe easier to bend, which is beneficial to the coiling of the composite pipe. On the other hand, the multiple corrugations are equivalent to setting multiple reinforcing ribs on the outer circumferential surface of the steel pipe protective layer 8, thereby further improving the external pressure resistance of the steel pipe protective layer 8, and improving the tensile strength of the connection between the steel pipe protective layer 8 and the surface oil station and the downhole oil pump body, thus protecting the plastic core pipe 3, the protective reinforcement layer 7, etc.

[0038] In some embodiments, the tensile composite pipe of this invention further includes a transition layer 10, see [link to previous document]. Figure 1 and Figure 2 As shown, the transition layer 10 is disposed between the reinforcing layer 7 and the steel pipe protective layer 8. Thus, when the pipe with the steel pipe protective layer 8 is passed through a corrugating mill, multiple corrugations are formed on the outer circumferential surface of the steel pipe protective layer 8. The transition layer 10 prevents the steel pipe protective layer 8 from compressing the reinforcing strip of the reinforcing layer 7, such as fiberglass tape, during the corrugation process. When the reinforcing strip is fiberglass tape, its strength is easily damaged during the corrugation process on the outer circumferential surface of the steel pipe protective layer 8. Therefore, by providing the transition layer 10 between the reinforcing layer 7 and the steel pipe protective layer 8, a buffering effect is achieved, protecting the reinforcing layer 7 during the rolling of the steel pipe protective layer 8.

[0039] In some embodiments, the transition layer 10 comprises plastic laminated to the outer peripheral surface of the reinforcing layer 7 or fiberglass cloth wound around the outer peripheral surface of the reinforcing layer 7, and the steel pipe protective layer 8 covers the outer peripheral surface of the transition layer 10. Specifically, the pipe having the reinforcing layer 7 is passed through an extruder, which extrudes plastic into the pipe, causing the plastic to laminate onto the outer peripheral surface of the reinforcing layer 7, thereby forming the transition layer 10; or, fiberglass cloth is wound onto the pipe having the reinforcing layer 7 using a winding machine, and the fiberglass cloth is wound around the outer peripheral surface of the reinforcing layer 7 to form the transition layer 10 to protect the reinforcing layer 7.

[0040] In some embodiments, refer to Figure 2As shown, the outer protective layer includes an outer anti-corrosion layer 9, which is disposed on the outer circumferential surface of the steel pipe protective layer 8. The outer anti-corrosion layer 9 has anti-corrosion material, thereby improving the anti-corrosion performance of the composite pipe.

[0041] In some embodiments, an outer anti-corrosion layer 9 can be formed on the outer circumferential surface of the steel pipe protective layer 8 by sandblasting or coating with anti-corrosion materials. Alternatively, in other embodiments, at least one layer of anti-corrosion material, such as PA or HDPE, is laminated onto the outer circumferential surface of the steel pipe protective layer 8 using a composite mold. This outer anti-corrosion layer 9 can either closely conform to the corrugated shape of the steel pipe protective layer 8 or fill in the corrugated shape of the steel pipe protective layer 8, making the outer circumferential surface of the corresponding composite pipe relatively smooth.

[0042] According to a preferred embodiment of the tensile-resistant composite pipe provided by this utility model, refer to Figures 1-3 As shown, the tensile composite pipe comprises, from the inside out: a plastic core tube 3, an axial tensile layer 4, a wrapping layer 5, a plastic outer layer 6, a reinforcing layer 7, a transition layer 10, a steel pipe protective layer 8, and an outer anti-corrosion layer 9. A power cable 1 and a communication cable 2 are installed inside the plastic core tube 3. The axial tensile layer 4 comprises multiple layers of fiber bundles, which are sequentially laid on the outer peripheral wall of the plastic core tube 3. The axial tensile layer 4 is bonded to the plastic core tube 3 by adhesive or extrusion of molten plastic. A wrapping film is spirally wound on the outer peripheral surface of the axial tensile layer 4, with at least partial overlap between two adjacent spiral wrapping films to form a wrapping layer 5 covering the axial tensile layer 4. Plastic or rubber compound is laminated on the outer periphery of the wrapping layer 5 to form a plastic outer layer 6. Reinforcing strip is spirally wound on the outer periphery of the plastic outer layer 6 in a first direction and a second direction to form a reinforcing layer 7. A transition layer 10 is set on the outer periphery of the reinforcing layer 7. A steel pipe is wrapped on the outer periphery of the transition layer 10 to form a steel pipe protective layer 8. Multiple corrugations are formed on the outer periphery of the steel pipe protective layer 8 by a corrugating machine. Finally, at least one outer anti-corrosion layer 9 is laminated on the outer periphery of the steel pipe protective layer 8 by a composite mold.

[0043] The tensile-resistant composite pipe provided by this utility model improves the tensile strength of the overall pipe by integrating the axial tensile layer 4 with the plastic core pipe 3. Simultaneously, the outer circumferential surface of the reinforcing layer 7 is covered with a steel pipe protective layer 8, enhancing the tensile strength of the connection between the composite pipe and the surface oil station and the downhole pump body. Furthermore, the outer circumferential surface of the axial tensile layer 4 is covered with a wrapping layer 5, allowing for relative slippage between the integrated pipe (plastic core pipe 3 and axial tensile layer 4) and the reinforcing layer 7, transition layer 10, steel pipe protective layer 8, and outer anti-corrosion layer 9, which facilitates the coiling of the composite pipe. Multiple corrugations are formed on the outer circumferential surface of the steel pipe protective layer 8, further facilitating the coiling of the composite pipe and improving its resistance to external pressure. The reinforcing layer 7 within the composite pipe improves its resistance to internal pressure. The transition layer 10 between the reinforcing layer 7 and the steel pipe protective layer 8 protects the reinforcing layer 7 during the rolling of the steel pipe protective layer 8.

[0044] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A tensile-resistant composite pipe, characterized in that, include: A plastic core tube (3) is provided with a cable; An axial tensile layer (4) is laid on the outer peripheral wall of the plastic core tube (3); A steel pipe protective layer (8) is disposed radially outside the axial tensile layer (4); and, An outer protective layer is disposed on the outer circumferential surface of the steel pipe protective layer (8); The axial tensile layer (4) includes fiber bundles, which are laid on the outer peripheral wall of the plastic core tube (3) along the axial direction of the plastic core tube (3), and the fiber bundles can be integrated with the plastic core tube (3).

2. The tensile-resistant composite pipe according to claim 1, characterized in that, The fiber bundles are multi-layered, and the multi-layered fiber bundles are laid in sequence to cover the plastic core tube (3).

3. The tensile-resistant composite pipe according to claim 1, characterized in that, The tensile composite pipe further includes a wrapping layer (5) disposed between the axial tensile layer (4) and the steel pipe protective layer (8), the wrapping layer (5) comprising a wrapping film spirally wound on the outer peripheral surface of the axial tensile layer (4).

4. The tensile-resistant composite pipe according to claim 3, characterized in that, The wrapping membranes of adjacent spirals adhere to each other.

5. The tensile-resistant composite pipe according to claim 3, characterized in that, The tensile composite pipe further includes a reinforcing layer (7) disposed between the wrapping layer (5) and the steel pipe protective layer (8), the reinforcing layer (7) comprising a reinforcing strip spirally wound on the radially outer side of the wrapping layer (5).

6. The tensile-resistant composite pipe according to claim 5, characterized in that, The tensile composite tube further includes a plastic outer layer (6), which is composited on the outer peripheral surface of the wrapping layer (5), and the reinforcing strip is spirally wound on the outer peripheral surface of the plastic outer layer (6).

7. The tensile-resistant composite pipe according to claim 6, characterized in that, The reinforcing strips are spirally wound around the outer peripheral surface of the plastic outer layer (6) along a first direction and a second direction, respectively, with the first direction and the second direction being opposite to each other.

8. The tensile-resistant composite pipe according to claim 6, characterized in that, The tensile composite pipe further includes a transition layer (10) disposed between the reinforcing layer (7) and the steel pipe protective layer (8). The transition layer (10) includes plastic on the outer peripheral surface of the reinforcing layer (7) or fiberglass cloth wrapped around the outer peripheral surface of the reinforcing layer (7).

9. The tensile-resistant composite pipe according to claim 1, characterized in that, Multiple ripples are formed on the outer circumferential surface of the steel pipe protective layer (8).

10. The tensile-resistant composite pipe according to any one of claims 1-9, characterized in that, The outer protective layer includes an outer anti-corrosion layer (9), which is disposed on the outer circumferential surface of the steel pipe protective layer (8).

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