Longitudinal tensile plastic composite pipe
By introducing a longitudinal tensile layer composed of high-strength wires into the plastic composite pipe, the problem of easy damage to spirally wound reinforced composite pipes under longitudinal force is solved, and the stability and pressure-bearing capacity of the composite pipe under large longitudinal force are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN GOLDSTONE ORIENT NEW MATERIAL TECH CO LTD
- Filing Date
- 2025-08-04
- Publication Date
- 2026-07-31
AI Technical Summary
Existing spiral-wound reinforced composite plastic pipes are prone to damage due to inward tightening force when subjected to longitudinal tension of thousands of meters vertically downward, and cannot effectively bear large longitudinal forces.
The longitudinal tensile layer is composed of multiple longitudinal high-strength wires, which are bonded together and distributed along the axial direction of the plastic core tube. They are also bonded to adjacent layers and independently bear the axial tensile force, while the reinforcing layer bears the internal pressure.
This improves the longitudinal bearing capacity of the composite pipe, preventing damage to the reinforcing layer or plastic core pipe due to inward tightening force, and ensuring the stability of the pipe under large longitudinal forces.
Smart Images
Figure CN224579899U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of composite pipe technology, and particularly relates to a longitudinal tensile plastic composite pipe. Background Technology
[0002] Currently, spirally wound reinforced composite plastic pipes are beginning to replace traditional steel pipes in downhole rodless oil production for delivery or water injection. These pipes, often thousands of meters long, are suspended from the wellhead into the vertical shaft. Existing RTP pipes typically have a plastic core with an outer reinforcing layer formed by reinforcing tape or wire, and a protective plastic outer layer (SY / T6662.2-2020 standard). Because the reinforcing layer is spirally wound, it cannot withstand the vertical tensile force of thousands of meters of pipe weight. Under significant longitudinal force, the spirally wound reinforcing tape or wire will exhibit inward tightening, eventually damaging the reinforcing layer or the plastic core (inner lining). Some existing technologies use high-strength wires wound at a smaller helix angle (2-10 degrees) around the reinforcing layer as tensile strength, but this does not completely solve the problem.
[0003] In the prior art, there is a relevant Chinese utility model patent with patent number 201621062364.3, entitled "Steel Wire Reinforced Plastic Pipe with Isolation and Protective Layer," which discloses: a steel wire reinforced plastic pipe with an isolation and protective layer, including an anti-corrosion layer, a polymer layer, a longitudinal steel wire layer, a wear-resistant layer, a transverse steel wire layer, and a rubber layer. The rubber layer is surrounded by a transverse steel wire layer, the transverse steel wire layer by a wear-resistant layer, the wear-resistant layer by a longitudinal steel wire layer, the longitudinal steel wire layer by a polymer layer, and the polymer layer by an anti-corrosion layer. This patent uses the longitudinal and transverse steel wire layers to form a mesh structure to bear the internal pressure of the pipe. However, although there is a longitudinal steel wire layer, its function is insufficient to independently bear the large longitudinal forces of the pipe. Summary of the Invention
[0004] To overcome the aforementioned problems of existing technologies, a longitudinal tensile plastic composite pipe that can better and independently bear the internal pressure and axial tensile force of the pipe is proposed.
[0005] To achieve the above-mentioned technical effects, the technical solution of this application is as follows: A longitudinal tensile plastic composite pipe includes a plastic core tube, and the plastic core tube is provided with a spiral wound reinforcement layer, a longitudinal tensile layer and a plastic outer layer. The longitudinal tensile layer includes multiple longitudinal high-strength wires, which are glued together. The multiple longitudinal high-strength wires are distributed along the axial direction of the plastic core tube. The longitudinal tensile layer is glued together with the adjacent layers.
[0006] Furthermore, the longitudinal high-strength yarn is an aramid filament, an aramid cloth, or an aramid unidirectional tape.
[0007] Furthermore, the spiral winding reinforcement layer is specifically made of fiberglass tape, polyester tape, aramid tape, steel cord tape, or steel fiber tape.
[0008] Furthermore, a spiral winding reinforcement layer is provided outside the plastic core tube, and a longitudinal tensile layer is provided outside the spiral winding reinforcement layer. A plastic outer layer is provided outside the longitudinal tensile layer, and the plastic outer layer is directly extruded and laminated to the outside of the longitudinal tensile layer.
[0009] Furthermore, an intermediate transition layer is provided between the spiral winding reinforcing layer and the longitudinal tensile layer. The intermediate transition layer is formed by extruding plastic through an extruder and then bonding a layer of plastic or adhesive onto the outer surface of the spiral winding reinforcing layer using a composite mold.
[0010] Alternatively, the plastic core tube may be provided with a longitudinal tensile layer, a spiral winding reinforcement layer may be provided outside the longitudinal tensile layer, and a plastic outer layer may be provided outside the spiral winding reinforcement layer.
[0011] Alternatively, the longitudinal tensile layer may further include a first longitudinal tensile layer and a second longitudinal tensile layer. The first longitudinal tensile layer is disposed outside the plastic core tube. A spiral winding reinforcement layer is disposed outside the first longitudinal tensile layer. A second longitudinal tensile layer is disposed outside the spiral winding reinforcement layer. A plastic outer layer is disposed outside the second longitudinal tensile layer. Adjacent layers are bonded together.
[0012] Furthermore, the longitudinal tensile layer includes multiple sets of spaced longitudinal tensile groups, all of which are glued to the outside of the spiral wound reinforcing layer, and a plastic outer layer is provided on the outside of the spiral wound reinforcing layer and the multiple sets of longitudinal tensile groups.
[0013] Furthermore, the longitudinal tensile layer is a single layer of longitudinal high-strength filament.
[0014] Furthermore, the longitudinal tensile layer is composed of multiple layers of longitudinal high-strength filaments, with adjacent layers of longitudinal high-strength filaments bonded together.
[0015] The advantages of this application are: 1. This application can prevent the composite pipe from being damaged by the inward wrapping force under large longitudinal force, thus improving the longitudinal bearing capacity of the composite pipe.
[0016] 2. In this application, the internal pressure of the pipe is borne by the wound reinforcing layer, while the longitudinal tensile layer only bears the axial tensile force. The two pressures are borne by different structures respectively. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 2 of this application.
[0018] Figure 2 This is a radial sectional view of Embodiment 2 of this application.
[0019] Figure 3 This is a radial sectional view of Embodiment 3 of this application.
[0020] Figure 4 This is a radial sectional view of Embodiment 4 of this application.
[0021] Figure 5 This is a radial sectional view of Embodiment 5 of this application.
[0022] Figure 6 This is a schematic diagram of the distribution of multiple longitudinal tensile groups in Example 6.
[0023] In the attached image: 1-Plastic core tube, 2-Spiral winding reinforcement layer, 3-Longitudinal tensile layer, 4-Plastic outer layer, 5-Intermediate transition layer, 6-First longitudinal tensile layer, 7-Second longitudinal tensile layer, 8-Longitudinal tensile group. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0027] In the description of this application, it should be noted that the terms "upper," "vertical," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0028] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0029] Example 1 A longitudinal tensile-resistant plastic composite pipe includes a plastic core tube 1, with a spirally wound reinforcing layer 2, a longitudinal tensile-resistant layer 3, and a plastic outer layer 4 surrounding the core tube 1. The longitudinal tensile-resistant layer 3 comprises multiple longitudinal high-strength filaments bonded together. These filaments are distributed along the axial direction of the core tube 1, and are coated or heat-fused with an adhesive layer. The longitudinal tensile-resistant layer 3 is arranged along the length of the RTP pipe, a non-existent spiral winding arrangement. The longitudinal tensile-resistant layer 3 is bonded to adjacent layers. Adjacent longitudinal high-strength filaments in the longitudinal tensile-resistant layer 3 are bonded together, and the longitudinal tensile-resistant layer 3 is also bonded to the plastic or adhesive in the adjacent pipe wall. This can be achieved through heat welding or heat-fused bonding of the adhesive layer onto the tensile-resistant layer.
[0030] The longitudinal high-strength yarn is made of aramid filament, aramid fabric, or aramid unidirectional tape. Among them, aramid filament has both high tensile strength and toughness, making it less prone to breakage. In addition, reinforcing filaments and wires with a breaking force of over 2000N can also be used here.
[0031] The spiral-wound reinforcing layer 2 is made of fiberglass tape, polyester tape, aramid tape, steel cord tape, or steel fiber tape.
[0032] This application avoids the situation where the composite pipe is damaged by inward tightening force under large longitudinal forces, thus improving the longitudinal bearing capacity of the composite pipe. In this application, the internal pressure of the pipe is borne by the wound reinforcing layer, while the longitudinal tensile layer 3 only bears the axial tensile force. The two pressures are borne by different structures respectively.
[0033] Example 2 like Figure 1 and Figure 2 As shown, a longitudinal tensile plastic composite pipe includes a plastic core tube 1. The plastic core tube 1 is surrounded by a spirally wound reinforcing layer 2, a longitudinal tensile layer 3, and a plastic outer layer 4. The longitudinal tensile layer 3 comprises multiple longitudinal high-strength filaments bonded together. These filaments are distributed along the axial direction of the plastic core tube 1, and are coated or hot-melt bonded with an adhesive layer. The longitudinal tensile layer 3 is arranged along the length of the RTP pipe, a non-existent spiral winding arrangement. The longitudinal tensile layer 3 is bonded to adjacent layers. Adjacent longitudinal high-strength filaments in the longitudinal tensile layer 3 are bonded together, and the longitudinal tensile layer 3 is also bonded to the plastic or adhesive in the adjacent pipe wall. This can be achieved through heat welding or hot-melt bonding of the adhesive layer onto the tensile layer.
[0034] The longitudinal high-strength yarn is made of aramid filament, aramid fabric, or aramid unidirectional tape. Among them, aramid filament has both high tensile strength and toughness, making it less prone to breakage. In addition, reinforcing filaments and wires with a breaking force of over 2000N can also be used here.
[0035] The spiral-wound reinforcing layer 2 is made of fiberglass tape, polyester tape, aramid tape, steel cord tape, or steel fiber tape.
[0036] A spirally wound reinforcing layer 2 is provided outside the plastic core tube 1. Outside the spirally wound reinforcing layer 2 is a longitudinal tensile layer 3. A plastic outer layer 4 is provided outside the longitudinal tensile layer 3, and the plastic outer layer 4 is directly extruded and laminated onto the longitudinal tensile layer 3. Preferably, the outer surface of the longitudinal tensile layer 3 is heated before entering the outer layer lamination mold to facilitate hot-melt lamination. The plastic outer layer 4 can be a high-density polyethylene layer.
[0037] The longitudinal tensile layer 3 is a single layer of longitudinal high-strength wire.
[0038] Example 3 A longitudinal tensile-resistant plastic composite pipe includes a plastic core tube 1, with a spirally wound reinforcing layer 2, a longitudinal tensile-resistant layer 3, and a plastic outer layer 4 surrounding the core tube 1. The longitudinal tensile-resistant layer 3 comprises multiple longitudinal high-strength filaments bonded together. These filaments are distributed along the axial direction of the core tube 1, and are coated or heat-fused with an adhesive layer. The longitudinal tensile-resistant layer 3 is arranged along the length of the RTP pipe, a non-existent spiral winding arrangement. The longitudinal tensile-resistant layer 3 is bonded to adjacent layers. Adjacent longitudinal high-strength filaments in the longitudinal tensile-resistant layer 3 are bonded together, and the longitudinal tensile-resistant layer 3 is also bonded to the plastic or adhesive in the adjacent pipe wall. This can be achieved through heat welding or heat-fused bonding of the adhesive layer onto the tensile-resistant layer.
[0039] The longitudinal high-strength yarn is made of aramid filament, aramid fabric, or aramid unidirectional tape. Among them, aramid filament has both high tensile strength and toughness, making it less prone to breakage. In addition, reinforcing filaments and wires with a breaking force of over 2000N can also be used here.
[0040] The spiral-wound reinforcing layer 2 is made of fiberglass tape, polyester tape, aramid tape, steel cord tape, or steel fiber tape.
[0041] like Figure 3 As shown, a spirally wound reinforcing layer 2 is provided outside the plastic core tube 1. Outside the spirally wound reinforcing layer 2 is a longitudinal tensile layer 3. A plastic outer layer 4 is provided outside the longitudinal tensile layer 3, and the plastic outer layer 4 is directly extruded and laminated onto the longitudinal tensile layer 3. Preferably, the outer surface of the longitudinal tensile layer 3 is heated before entering the outer layer lamination mold to facilitate hot-melt lamination. The plastic outer layer 4 can be a high-density polyethylene layer. An intermediate transition layer 5 is provided between the spirally wound reinforcing layer 2 and the longitudinal tensile layer 3. The intermediate transition layer 5 is formed by extruding plastic through an extruder and laminating it onto the outer surface of the spirally wound reinforcing layer 2 using a lamination mold. Its purpose is to isolate and buffer the longitudinal fibers from damage to the glass fiber reinforcing layer, as glass fiber is brittle and will break microscopically due to excessive compression, friction, or bending.
[0042] The spiral-wound reinforcing layer 2 is made of glass fiber (glass fiber filaments or glass fiber tape). An intermediate transition layer 5 (plastic) is placed outside the glass fiber reinforcing layer, and a longitudinal tensile layer 3 is arranged outside the intermediate transition layer 5 (plastic). This is because glass fiber is easily brittle under external force or friction, resulting in a sharp decrease in reinforcing performance. Therefore, the intermediate transition layer 5 (plastic) is added to reduce friction in the longitudinal tensile layer 3. If the reinforcing layer is made of steel wire, steel fiber tape, steel cord, polyester tape, or aramid tape, then the intermediate transition layer 5 (plastic) is not required.
[0043] The longitudinal tensile layer 3 consists of multiple layers of longitudinal high-strength filaments, with the longitudinal high-strength filaments of adjacent layers bonded together.
[0044] Example 4 A longitudinal tensile-resistant plastic composite pipe includes a plastic core tube 1, with a spirally wound reinforcing layer 2, a longitudinal tensile-resistant layer 3, and a plastic outer layer 4 surrounding the core tube 1. The longitudinal tensile-resistant layer 3 comprises multiple longitudinal high-strength filaments bonded together. These filaments are distributed along the axial direction of the core tube 1, and are coated or heat-fused with an adhesive layer. The longitudinal tensile-resistant layer 3 is arranged along the length of the RTP pipe, a non-existent spiral winding arrangement. The longitudinal tensile-resistant layer 3 is bonded to adjacent layers. Adjacent longitudinal high-strength filaments in the longitudinal tensile-resistant layer 3 are bonded together, and the longitudinal tensile-resistant layer 3 is also bonded to the plastic or adhesive in the adjacent pipe wall. This can be achieved through heat welding or heat-fused bonding of the adhesive layer onto the tensile-resistant layer.
[0045] Furthermore, the longitudinal high-strength yarn is aramid filament, aramid fabric, or aramid unidirectional tape. Aramid filament, in particular, possesses both high tensile strength and toughness, making it resistant to breakage. In addition, reinforcing filaments and wires with a breaking force of over 2000N can also be used here.
[0046] Furthermore, the spiral wound reinforcing layer 2 is specifically composed of fiberglass tape, polyester tape, aramid tape, steel cord tape, or steel fiber tape.
[0047] like Figure 4 As shown, a longitudinal tensile layer 3 is provided outside the plastic core tube 1, and a spiral winding reinforcement layer 2 is provided outside the longitudinal tensile layer 3. A plastic outer layer 4 is provided outside the spiral winding reinforcement layer 2. The spiral winding reinforcement layer 2 can adopt a spiral winding angle of 54 degrees and 44 minutes. This angle has been proven through long-term application to have the best ability to withstand the internal pressure in the axial and radial directions.
[0048] Example 5 A longitudinal tensile-resistant plastic composite pipe includes a plastic core tube 1, with a spirally wound reinforcing layer 2, a longitudinal tensile-resistant layer 3, and a plastic outer layer 4 surrounding the core tube 1. The longitudinal tensile-resistant layer 3 comprises multiple longitudinal high-strength filaments bonded together. These filaments are distributed along the axial direction of the core tube 1, and are coated or heat-fused with an adhesive layer. The longitudinal tensile-resistant layer 3 is arranged along the length of the RTP pipe, a non-existent spiral winding arrangement. The longitudinal tensile-resistant layer 3 is bonded to adjacent layers. Adjacent longitudinal high-strength filaments in the longitudinal tensile-resistant layer 3 are bonded together, and the longitudinal tensile-resistant layer 3 is also bonded to the plastic or adhesive in the adjacent pipe wall. This can be achieved through heat welding or heat-fused bonding of the adhesive layer onto the tensile-resistant layer.
[0049] The longitudinal high-strength yarn is made of aramid filament, aramid fabric, or aramid unidirectional tape. Among them, aramid filament has both high tensile strength and toughness, making it less prone to breakage. In addition, reinforcing filaments and wires with a breaking force of over 2000N can also be used here.
[0050] The spiral-wound reinforcing layer 2 is made of fiberglass tape, polyester tape, aramid tape, steel cord tape, or steel fiber tape.
[0051] like Figure 5 As shown, the longitudinal tensile layer 3 includes a first longitudinal tensile layer 6 and a second longitudinal tensile layer 7. The first longitudinal tensile layer 6 is provided outside the plastic core tube 1. A spiral winding reinforcement layer 2 is provided outside the first longitudinal tensile layer 6. A second longitudinal tensile layer 7 is provided outside the spiral winding reinforcement layer 2. A plastic outer layer 4 is provided outside the second longitudinal tensile layer 7. Adjacent layers are glued together.
[0052] Example 6 A longitudinal tensile-resistant plastic composite pipe includes a plastic core tube 1, with a spirally wound reinforcing layer 2, a longitudinal tensile-resistant layer 3, and a plastic outer layer 4 surrounding the core tube 1. The longitudinal tensile-resistant layer 3 comprises multiple longitudinal high-strength filaments bonded together. These filaments are distributed along the axial direction of the core tube 1, and are coated or heat-fused with an adhesive layer. The longitudinal tensile-resistant layer 3 is arranged along the length of the RTP pipe, a non-existent spiral winding arrangement. The longitudinal tensile-resistant layer 3 is bonded to adjacent layers. Adjacent longitudinal high-strength filaments in the longitudinal tensile-resistant layer 3 are bonded together, and the longitudinal tensile-resistant layer 3 is also bonded to the plastic or adhesive in the adjacent pipe wall. This can be achieved through heat welding or heat-fused bonding of the adhesive layer onto the tensile-resistant layer.
[0053] The longitudinal high-strength yarn is made of aramid filament, aramid fabric, or aramid unidirectional tape. Among them, aramid filament has both high tensile strength and toughness, making it less prone to breakage. In addition, reinforcing filaments and wires with a breaking force of over 2000N can also be used here.
[0054] The spiral-wound reinforcing layer 2 is made of fiberglass tape, polyester tape, aramid tape, steel cord tape, or steel fiber tape.
[0055] like Figure 6 As shown, the longitudinal tensile layer 3 includes multiple sets of spaced longitudinal tensile groups 8, which are all glued to the outside of the spiral wound reinforcing layer 2. A plastic outer layer 4 is provided on the outside of the spiral wound reinforcing layer 2 and the multiple sets of longitudinal tensile groups 8. Multiple tensile filaments can be arranged into a 0-degree unidirectional tape using a tape production line to form the longitudinal tensile groups 8. Each set of longitudinal tensile groups 8 is an arc segment in cross-section, rather than a complete circle, with multiple arc segments spaced apart.
Claims
1. A longitudinally tensile plastic composite pipe comprising a plastic core pipe (1), characterized in that: The plastic core tube (1) is provided with a spiral winding reinforcement layer (2), a longitudinal tensile layer (3) and a plastic outer layer (4). The longitudinal tensile layer (3) includes multiple longitudinal high-strength wires, which are glued together. The multiple longitudinal high-strength wires are distributed along the axial direction of the plastic core tube (1). The longitudinal tensile layer (3) is glued together with the adjacent layers.
2. The longitudinally tensile plastic composite pipe according to claim 1, characterized in that: The longitudinal high-strength yarn is aramid filament, aramid cloth, or aramid unidirectional tape.
3. The longitudinally tensile plastic composite pipe according to claim 1, wherein: The spiral winding reinforcement layer (2) is specifically made of fiberglass tape, polyester tape, aramid tape, steel cord tape or steel fiber tape.
4. The longitudinally tensile plastic composite pipe of claim 1, wherein: The plastic core tube (1) is provided with a spiral winding reinforcement layer (2), and the outside of the spiral winding reinforcement layer (2) is a longitudinal tensile layer (3). The longitudinal tensile layer (3) is provided with a plastic outer layer (4), which is directly extruded and composited on the outside of the longitudinal tensile layer (3).
5. The longitudinally tensile plastic composite pipe according to claim 4, wherein: An intermediate transition layer (5) is provided between the spiral winding reinforcing layer (2) and the longitudinal tensile layer (3). The intermediate transition layer (5) is formed by extruding plastic through an extruder and then bonding a layer of plastic or adhesive onto the outer surface of the spiral winding reinforcing layer (2) using a composite mold.
6. The longitudinally tensile plastic composite pipe of claim 1, wherein: The plastic core tube (1) is provided with a longitudinal tensile layer (3), the longitudinal tensile layer (3) is provided with a spiral winding reinforcement layer (2), and the spiral winding reinforcement layer (2) is provided with a plastic outer layer (4).
7. The longitudinally tensile plastic composite pipe of claim 1, wherein: The longitudinal tensile layer (3) includes a first longitudinal tensile layer (6) and a second longitudinal tensile layer (7). The plastic core tube (1) is provided with a first longitudinal tensile layer (6). The first longitudinal tensile layer (6) is provided with a spiral winding reinforcement layer (2). The spiral winding reinforcement layer (2) is provided with a second longitudinal tensile layer (7). The second longitudinal tensile layer (7) is provided with a plastic outer layer (4). The adjacent layers are glued together.
8. The longitudinally tensile plastic composite pipe of claim 1, wherein: The longitudinal tensile layer (3) includes multiple sets of spaced longitudinal tensile groups (8), which are all glued to the outside of the spiral wound reinforcing layer (2). A plastic outer layer (4) is provided on the outside of the spiral wound reinforcing layer (2) and the multiple sets of longitudinal tensile groups (8).
9. The longitudinally tensile plastic composite pipe of claim 1, wherein: The longitudinal tensile layer (3) is a single layer of longitudinal high-strength filament.
10. The longitudinally tensile plastic composite pipe of claim 1, wherein: The longitudinal tensile layer (3) consists of multiple layers of longitudinal high-strength filaments, with the longitudinal high-strength filaments of adjacent layers bonded together.