Composite continuous pipeline capable of resisting temperature of 150 DEG C and manufacturing method

Abstract

The invention relates to a composite continuous pipeline capable of resisting the temperature of 150 DEG C and a manufacturing method, and belongs to the technical field of oil exploitation. According to the technical scheme, a power line and a signal line are embedded into a modified PA continuous pipe (1) in the forming process, and the power line and the signal line are directly embedded into the pipe wall of the modified PA continuous pipe (1) in the forming process of the modified PA continuous pipe (1); the power lines and the signal lines are arranged at intervals in the pipe wall of the modified PA continuous pipe (1) in the circumferential direction. The continuous plastic hose has the beneficial effects that the structure of combining the modified anti-scaling high-temperature-resistant PA continuous pipe and the reinforced fibers is adopted, the temperature resistance grade of the continuous plastic hose is increased to 150 DEG C, the corrosion resistance is improved, the scaling problem is reduced, the power line and the signal line are integrated in the PA lining layer, integration of electric power and data transmission is achieved, intelligent oil extraction is achieved, and the service life of the continuous plastic hose is prolonged. And the modified polytetrafluoroethylene outer sheath is adopted, so that the corrosion resistance is further improved, and the service life of the pipeline is prolonged.

Description

Technical Field

[0001] The present invention relates to a composite continuous pipeline with a temperature resistance of 150 °C and a manufacturing method thereof, belonging to the technical field of oil extraction. Background Art

[0002] In the process of oil extraction, continuous pipelines (also known as coiled tubing, continuous pipes, etc.) play a crucial role. At present, in existing technology oil fields, some continuous pipelines use high-temperature resistant oil pipes. Most continuous pipelines are made of metal pipes, and crude oil flows inside the metal pipes. As the operation time increases, dirt will form on both the inner and outer walls of the metal pipes. In particular, the inner wall of the pipe is severely scaled, forming hard scale that extends inward and outward; the inward extension causes corrosion of the inner wall of the metal pipe, reducing the wall strength; the outward extension makes the scale accumulate thicker, increasing the thermal resistance; corrosion and dirt are the main reasons directly affecting the heat transfer efficiency. Some existing technology continuous pipelines also use plastic bundled pipelines to replace metal pipes, which solves certain problems. However, the maximum temperature resistance of plastic bundled pipelines is 120 °C. When facing acidic and alkaline media such as hydrogen sulfide (H2S) and carbon dioxide (CO2), plastic bundled pipelines are easily corroded, shortening their service life. Moreover, due to the limitations of the material properties of existing technology plastic bundled pipelines (plastic hoses), they perform poorly in anti-scaling. Impurities such as wax and gum in crude oil are extremely easy to adhere to the pipe wall, resulting in reduced transportation efficiency. And plastic bundled pipelines have poor resistance to acid and alkali corrosion and are difficult to operate stably in complex acidic and alkaline media for a long time, further limiting their application in the oil extraction environment. Summary of the Invention

[0003] The purpose of the present invention is to provide a composite continuous pipeline with a temperature resistance of 150 °C and a manufacturing method thereof. By adopting a structure combining a modified anti-scaling and high-temperature resistant PA continuous pipe and reinforcing fibers, the temperature resistance level of the continuous plastic hose is increased to 150 °C, the corrosion resistance is improved, and the scaling problem is reduced. Power lines and signal lines are integrated in the PA inner liner to achieve the integration of power and data transmission, realizing intelligent oil production. By using a modified polytetrafluoroethylene outer sheath, the corrosion resistance is further improved, the service life of the pipeline is extended, and the above technical problems existing in the existing technology are solved.

[0004] The technical solution of the present invention is as follows: A composite continuous pipeline with a temperature resistance of 150 °C, comprising a modified PA continuous pipe, a power line, and a signal line. The power line and the signal line are embedded in the modified PA continuous pipe during the forming process. The power line is composed of multiple copper conductors II. The signal line includes a copper conductor I, a PVDF insulation, and a tinned copper wire shield arranged from the inside to the outside. During the forming process of the modified PA continuous pipe, the power line and the signal line are directly embedded into the pipe wall of the modified PA continuous pipe. The power line and the signal line are arranged at intervals in the circumferential direction within the pipe wall of the modified PA continuous pipe.

[0005] The modified PA continuous pipe is prepared by adding nano-montmorillonite and carbon nanotubes to PA material. The modified PA continuous pipe is a non-metallic composite material pipe for anti-scaling. The PA material, whose full name is Polyamide, is commonly known as nylon and is a high-performance engineering plastic. The PVDF is the abbreviation of polyvinylidene fluoride and is a highly non-reactive thermoplastic fluoropolymer.

[0006] A laminated fiber layer is arranged outside the modified PA continuous pipe as the inner protective layer of the non-metallic composite material pipe; the laminated fiber layer is composed of Kevlar aramid or carbon fiber filaments; the outer wall of the modified PA continuous pipe is coated with hot melt adhesive, and the laminated fiber layer is bonded to the modified PA continuous pipe.

[0007] An enhanced fiber layer is wound outside the laminated fiber layer. The enhanced fiber layer is composed of glass fibers, and the glass fibers are helically wound on the surface of the laminated fiber layer.

[0008] A modified polytetrafluoroethylene outer sheath is arranged outside the enhanced fiber layer.

[0009] A manufacturing method of a composite continuous pipeline resistant to 150 °C temperature. The modified PA continuous pipe, the laminated fiber layer, the enhanced fiber layer and the modified polytetrafluoroethylene outer sheath are sequentially arranged from the inside to the outside; the modified PA continuous pipe is prepared by adding nano-montmorillonite and carbon nanotubes to PA material. The modified PA continuous pipe is a non-metallic composite material pipe for anti-scaling. The addition amounts of nano-montmorillonite and carbon nanotubes are respectively 3%-5% and 0.5%-2% of the total mass in the PA material; during the forming process of the modified PA continuous pipe, a power line and a signal line are embedded inside. The power line is composed of multiple copper conductors II, and the signal line includes a copper conductor I, a PVDF insulation and a tinned copper wire shield arranged from the inside to the outside; during the forming process of the modified PA continuous pipe, the power line and the signal line are directly embedded into the pipe wall of the modified PA continuous pipe; the power line and the signal line are arranged at intervals in the circumferential direction inside the pipe wall of the modified PA continuous pipe.

[0010] The PA material, whose full name is Polyamide, is commonly known as nylon and is a high-performance engineering plastic; based on the traditional PA material, 3%-5% by mass ratio of nano-montmorillonite is added in the present invention to improve the thermal stability; 0.5%-2% by mass ratio of carbon nanotubes is added to improve the thermal conductivity and mechanical strength and extend the service life of the pipeline; it can not only prevent scaling and effectively resist the corrosion of acidic and alkaline media such as hydrogen sulfide (H2S) and carbon dioxide (CO2), but also raise the long-term allowable working temperature to 150 °C, greatly extending the service life of the pipeline.

[0011] Since the signal wire is added with a tinned copper wire shield and embedded into the wall of the modified PA continuous pipe, there is no electromagnetic interference between the power wire and the signal wire, and precise oil production or intelligent oil production can be realized. The PVDF is the abbreviation of polyvinylidene fluoride and is a highly non-reactive thermoplastic fluoropolymer.

[0012] A laminated fiber layer is arranged outside the modified PA continuous pipe as the inner protective layer of the non-metallic composite material pipe; the laminated fiber layer is composed of Kevlar aramid or carbon fiber filaments to enhance the axial tensile force of the continuous pipe; the outer wall of the modified PA continuous pipe is coated with hot melt adhesive, and the laminated fiber layer is bonded to the modified PA continuous pipe.

[0013] An enhanced fiber layer is wound outside the laminated fiber layer. The enhanced fiber layer is composed of glass fibers to enhance the circumferential bearing pressure of the continuous pipe. The glass fibers are helically wound on the surface of the laminated fiber layer to control the fiber tension and angle. After winding, the glass fibers are dip-coated with high-temperature resin to enhance the interfacial bonding force between the fibers and the resin matrix, and finally cured in a hot oven.

[0014] The modified polytetrafluoroethylene outer sheath. Polytetrafluoroethylene itself has extremely strong chemical stability, and the modified material is well-known, and its corrosion resistance is further improved. In the face of complex chemical environments in oil extraction, such as acidic and alkaline media such as hydrogen sulfide (H2S) and carbon dioxide (CO2), the modified polytetrafluoroethylene can effectively resist erosion and avoid serious corrosion phenomena like traditional metal pipelines, thus greatly extending the service life of the pipeline.

[0015] The beneficial effects of the present invention: adopting the structure of combining the modified scale-inhibiting and high-temperature-resistant PA continuous pipe with the enhanced fiber, the temperature resistance grade of the continuous plastic hose is increased to 150 °C, the corrosion resistance is improved, and the scale formation problem is reduced. The power wire and the signal wire are integrated in the PA inner lining layer to realize the integration of power and data transmission, and intelligent oil production is realized. The modified polytetrafluoroethylene outer sheath is adopted to further improve the corrosion resistance and extend the service life of the pipeline. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a partial enlarged view of the signal wire of an embodiment of the present invention; In the figure: modified PA continuous pipe 1, copper conductor one 2, PVDF insulation 3, tinned copper wire shield 4, copper conductor two 5, laminated fiber layer 6, enhanced fiber layer 7, modified polytetrafluoroethylene outer sheath 8. Detailed Embodiments

[0017] The following further describes the present invention through embodiments in conjunction with the drawings.

[0018] A composite continuous pipeline with a temperature resistance of 150 °C, comprising a modified PA continuous pipe 1, a power line and a signal line. The power line and the signal line are embedded in the modified PA continuous pipe 1 during the forming process. The power line is composed of multiple copper conductors 5. The signal line includes a copper conductor 1, a PVDF insulation 3 and a tinned copper wire shield 4 arranged from the inside to the outside. During the forming process of the modified PA continuous pipe 1, the power line and the signal line are directly embedded in the pipe wall of the modified PA continuous pipe 1. The power line and the signal line are arranged at intervals in the circumferential direction within the pipe wall of the modified PA continuous pipe 1.

[0019] The modified PA continuous pipe 1 is prepared by adding nano-montmorillonite and carbon nanotubes to the PA material. The modified PA continuous pipe 1 is a non-metallic composite material pipe for anti-scaling. The PA material, also known as polyamide (Polyamide), commonly known as nylon, is a high-performance engineering plastic. The PVDF is the abbreviation of polyvinylidene fluoride, which is a highly non-reactive thermoplastic fluoropolymer.

[0020] A laminated fiber layer 6 is provided outside the modified PA continuous pipe as an inner protective layer of the non-metallic composite material pipe. The laminated fiber layer 6 is composed of Kevlar aramid or carbon fiber filaments. The outer wall of the modified PA continuous pipe 1 is coated with hot melt adhesive, and the laminated fiber layer is bonded to the modified PA continuous pipe 1.

[0021] The reinforced fiber layer 7 is wound outside the laminated fiber layer 6. The reinforced fiber layer 7 is composed of glass fibers, and the glass fibers are helically wound on the surface of the laminated fiber layer 6.

[0022] A manufacturing method of a composite continuous pipeline with a temperature resistance of 150 °C. The modified PA continuous pipe 1, the laminated fiber layer 6, the reinforced fiber layer 7 and the modified polytetrafluoroethylene outer sheath are arranged in sequence from the inside to the outside. The modified PA continuous pipe 1 is prepared by adding nano-montmorillonite and carbon nanotubes to the PA material. The modified PA continuous pipe 1 is a non-metallic composite material pipe for anti-scaling. The addition amounts of nano-montmorillonite and carbon nanotubes are 3%-5% and 0.5%-2% of the total mass in the PA material respectively. The power line and the signal line are embedded in the modified PA continuous pipe 1 during the forming process. The power line is composed of multiple copper conductors 5. The signal line includes a copper conductor 1, a PVDF insulation 3 and a tinned copper wire shield 4 arranged from the inside to the outside. During the forming process of the modified PA continuous pipe 1, the power line and the signal line are directly embedded in the pipe wall of the modified PA continuous pipe 1. The power line and the signal line are arranged at intervals in the circumferential direction within the pipe wall of the modified PA continuous pipe 1.

[0023] PA material, whose full name is Polyamide and is commonly known as nylon, is a high-performance engineering plastic. Based on the traditional PA material, the present invention adds nano-montmorillonite with a mass ratio of 3%-5% to improve thermal stability, and adds carbon nanotubes with a mass ratio of 0.5%-2% to improve thermal conductivity and mechanical strength, thereby extending the service life of the pipeline. It can not only prevent scale formation and effectively resist the corrosion of acidic and alkaline media such as hydrogen sulfide (H2S) and carbon dioxide (CO2), but also raise the long-term allowable working temperature to 150°C, greatly extending the service life of the pipeline.

[0024] Since the signal wire is added with a tin-plated copper wire shield and embedded in the wall of the modified PA continuous pipe 1, there is no electromagnetic interference between the power wire and the signal wire, and precise oil production or intelligent oil production can be achieved. The PVDF is the abbreviation of polyvinylidene fluoride and is a highly non-reactive thermoplastic fluoropolymer.

[0025] A laminated fiber layer 6 is arranged outside the modified PA continuous pipe as the inner protective layer of the non-metallic composite material pipe. The laminated fiber layer 6 is composed of Kevlar aramid or carbon fiber filaments to enhance the axial tensile force of the continuous pipe. The outer wall of the modified PA continuous pipe 1 is coated with hot melt adhesive, and the laminated fiber layer is bonded to the modified PA continuous pipe 1.

[0026] An enhanced fiber layer 7 is wound outside the laminated fiber layer 6. The enhanced fiber layer 7 is composed of glass fibers to enhance the circumferential bearing pressure of the continuous pipe. The glass fibers are helically wound on the surface of the laminated fiber layer 6 to control the fiber tension and angle. After winding, the glass fibers are impregnated with high-temperature resin to enhance the interfacial bonding force between the fibers and the resin matrix, and finally cured by a hot oven.

[0027] A modified polytetrafluoroethylene outer sheath 8 is arranged outside the enhanced fiber layer 7. The polytetrafluoroethylene itself has extremely strong chemical stability, and the modified material is well-known, and its corrosion resistance is further improved. In the face of the complex chemical environment in oil exploitation, such as acidic and alkaline media such as hydrogen sulfide (H2S) and carbon dioxide (CO2), the modified polytetrafluoroethylene can effectively resist erosion and avoid serious corrosion phenomena like traditional metal pipelines, thereby greatly extending the service life of the pipeline.

[0028] In the embodiment, the modified PA continuous pipe has the following five specific implementation manners: Calculated with the PA material as 100% by mass, the addition amounts of nano-montmorillonite and carbon nanotubes in each embodiment (with the PA material as 100%) and the performance test data of the manufactured continuous pipeline are as follows:

[0029] Conclusion: When the content of nano-montmorillonite is relatively high (such as in Examples 2, 3, and 5, with a content of 4.8% - 5.0%), the heat distortion temperature can reach 150 - 155 °C. Among them, the heat distortion temperature of Example 5 (5.0% nano-montmorillonite + 0.1% carbon nanotubes) is the highest (155 °C), indicating that a high content of nano-montmorillonite has a more significant effect on improving heat resistance.

[0030] When the content of carbon nanotubes is relatively high (such as in Examples 1 and 4, with a content of 1.9% - 2%), the thermal conductivity is higher (0.425 - 0.468 W / M·K). However, when the content of nano-montmorillonite is too high (such as in Example 5, 5.0%), the thermal conductivity drops to 0.312 W / M·K. This shows that carbon nanotubes are more crucial for improving thermal conductivity, and an excessive amount of nano-montmorillonite may inhibit the formation of the thermal conduction path.

[0031] The tensile strength of Example 4 (4.2% nano-montmorillonite + 2% carbon nanotubes) is the highest (99.8 MPa), indicating that the synergistic effect of a medium content of nano-montmorillonite and a relatively high content of carbon nanotubes can optimize the mechanical properties. When the content of nano-montmorillonite is too high (such as in Examples 2 and 5) or the content of carbon nanotubes is too low, the tensile strength decreases slightly, which may be caused by uneven dispersion of the filler or weakened interfacial bonding force.

[0032] The modified PA continuous pipe has achieved multi-dimensional performance improvement through the composite modification of nano-montmorillonite and carbon nanotubes, replacing traditional metal pipes (such as copper and steel) and ordinary engineering plastics. In practical applications, it is necessary to accurately adjust the filler ratio according to the scenario requirements (such as heat resistance priority, thermal conductivity priority, or mechanical property priority), and solve the problems of dispersion and interfacial bonding through process optimization to fully release the performance advantages of the material.

Claims

1. A composite continuous pipeline resistant to 150 °C, characterized in that: It includes a modified PA continuous tube (1), a power line and a signal line. The power line and the signal line are embedded in the modified PA continuous tube (1) during the molding process. The power line is composed of multiple copper conductors two (5), and the signal line includes a copper conductor one (2), a PVDF insulation (3) and a tinned copper wire shield (4) arranged from the inside to the outside. During the molding process of the modified PA continuous tube (1), the power line and the signal line are directly embedded into the tube wall of the modified PA continuous tube (1). The power line and the signal line are arranged at intervals in the circumferential direction within the tube wall of the modified PA continuous tube (1).

2. The composite continuous pipeline with a temperature resistance of 150 °C according to claim 1, wherein: A laminated fiber layer (6) is provided outside the modified PA continuous tube as the inner protective layer of the non-metallic composite material pipe. The laminated fiber layer (6) is composed of Kevlar aramid or carbon fiber filaments. The outer wall of the modified PA continuous tube (1) is coated with hot melt adhesive, and the laminated fiber layer is bonded to the modified PA continuous tube (1).

3. A composite continuous pipeline with a temperature resistance of 150 °C according to claim 2, characterized in that: The reinforced fiber layer (7) is wound outside the laminated fiber layer (6). The reinforced fiber layer (7) is composed of glass fibers, and the glass fibers are helically wound on the surface of the laminated fiber layer (6). A modified polytetrafluoroethylene outer sheath (8) is provided outside the reinforced fiber layer (7).

4. A manufacturing method of a composite continuous pipeline resistant to 150 °C, characterized in that: The modified PA continuous tube (1), the laminated fiber layer (6), the reinforced fiber layer (7) and the modified polytetrafluoroethylene outer sheath are arranged in sequence from the inside to the outside. The modified PA continuous tube (1) is prepared by adding nano-montmorillonite and carbon nanotubes to the PA material for modification. The modified PA continuous tube (1) is a non-metallic composite material pipe for anti-scaling. The addition amounts of nano-montmorillonite and carbon nanotubes are 3%-5% and 0.5%-2% of the total mass in the PA material respectively. The power line and the signal line are embedded in the modified PA continuous tube (1) during the molding process. The power line is composed of multiple copper conductors two (5), and the signal line includes a copper conductor one (2), a PVDF insulation (3) and a tinned copper wire shield (4) arranged from the inside to the outside. During the molding process of the modified PA continuous tube (1), the power line and the signal line are directly embedded into the tube wall of the modified PA continuous tube (1). The power line and the signal line are arranged at intervals in the circumferential direction within the tube wall of the modified PA continuous tube (1).

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