Flexible composite pipe for gathering and transportation of oil, manufacturing equipment and manufacturing method

Abstract

The present application belongs to the technical field of oil exploitation workover, and particularly relates to a flexible composite pipe for gathering and transporting oil, a composite pipe manufacturing device and a manufacturing method. The flexible composite pipe for gathering and transporting oil is of a multi-layer structure, comprising an inner pipe, the inner wall of the inner pipe is provided with a wax-resisting layer, the outer wall of the inner pipe is coated with a reinforcing layer, and the outer side of the reinforcing layer is provided with an outer pipe. The present application solves the problems of oil swelling resistance, wax deposition and blockage of the existing flexible composite pipe in the field of gathering and transporting oil. The intelligent manufacturing method improves the problems of low efficiency and high labor intensity in the production and trial production process of the flexible composite pipe, such as manual winding and traction, realizes automatic production, improves production efficiency, and reduces cost.

Description

Technical Field

[0001] This invention belongs to the field of petroleum composite pipe technology, and specifically relates to a flexible composite pipe for oil gathering and transportation, composite pipe manufacturing equipment and manufacturing method. Background Technology

[0002] Flexible composite pipes have gained widespread attention in oilfield surface water injection and alcohol injection due to their good corrosion resistance, quick installation, long service life, and low overall operating costs. They have become one of the effective solutions to oilfield corrosion. However, in crude oil gathering and transportation, and oil-water mixed transportation, the "similarity" between the lining material and the molecular structure of crude oil makes them prone to failure risks such as swelling and pipe collapse. Therefore, improving the oil swelling resistance of the flexible composite pipe lining material through modification technology to promote the development of oil-gathering and transportation flexible composite pipes can effectively improve the corrosion situation of steel pipelines and provide a guarantee for the safe operation of oil-water mixed transportation in oilfields.

[0003] A search revealed that CN113831654B discloses an inner lining material for a flexible composite pipe that improves the impermeability and corrosion resistance of non-metallic oil pipelines through blending modification of cross-linked polyethylene (XLPE). However, this invention only provides a method for preparing the inner lining material and does not involve the structural design and manufacturing process of the oil gathering and transportation pipe body. CN214838972U discloses a cross-linked polyethylene flexible composite pipe that solves the problem of poor tightness between the insulation layer and other material layers by providing several grooves in the fixed anti-corrosion layer, insulation layer, and reinforcing layer and inserting connecting blocks. The manufacturing process of the flexible composite pipes in the above patents is very complex and the operation efficiency is low. At the same time, they cannot fully meet the requirements of composite pipes used for oil-water gathering and transportation, and oil-water mixed transportation, where the transported medium contains H2S, CO2, Cl. - Impurities such as bacteria and microorganisms can cause environmental and safety problems such as pipe swelling and waxing. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a flexible composite pipe for oil gathering and transportation, composite pipe manufacturing equipment, and manufacturing method. This invention solves the problems of oil swelling, wax buildup, and blockage that occur in existing flexible composite pipes used in oil gathering and transportation. By employing intelligent manufacturing methods, the invention improves the low efficiency and high labor intensity caused by manual winding and traction during the trial production of flexible composite pipes, thereby achieving automated production, improving production efficiency, and reducing costs.

[0005] The technical solution of the present invention is: a flexible composite pipe for oil gathering and transportation, wherein the composite pipe has a multi-layer structure, including an inner pipe, the inner wall of the inner pipe is provided with an anti-wax layer, the outer wall of the inner pipe is covered with a reinforcing layer, and an outer pipe is provided outside the reinforcing layer.

[0006] The inner tube is made of one of the following materials: oil-resistant polyethylene, oil-resistant polypropylene, nylon, polyphenylene ether, polyketone, or polyimide.

[0007] The reinforcing layer includes one or more of the following: artificial fibers, steel wires, steel strips, and steel cords. The reinforcing layer is formed by spiral winding or weaving of the artificial fibers, steel wires, steel strips, and steel cords, with a winding angle ranging from 15° to 85°.

[0008] The man-made fiber is one or more of polyester fiber, polypropylene fiber, ultra-high molecular weight polyethylene fiber, nylon fiber, carbon fiber, and aramid fiber.

[0009] The thickness of the anti-wax layer 1 is 1mm to 2mm. The anti-wax layer is an oil-repellent polymer layer. The polymer layer is prepared by mixing an anti-wax agent and polyimide in a weight ratio of 5:95. The anti-wax agent includes either Basoflux PI40 / PI41 or Keroflux 3614. When the two are mixed, their weight ratio is 50:50.

[0010] A manufacturing equipment for flexible composite pipes for oil gathering and transportation, used to manufacture any of the flexible composite pipes for oil gathering and transportation as described above, includes an inner tube extruder, a first vacuum shaping machine, a first air cooler, an inner tube planetary cutter, a winding machine, a traction machine, an observation box, a coating extruder, a second vacuum shaping machine, a second air cooler, a reinforcing layer planetary cutter, a laser marking machine, and a composite pipe winding and unwinding rack, all arranged coaxially. A first mixing and feeding machine is connected above the inner tube extruder, and the first mixing and feeding machine is connected to a first vacuum suction pump, which is connected to a first high-speed color mixing machine. A robot is located outside the winding machine. A second mixing and feeding machine is located above the coating extruder, and the second mixing and feeding machine is connected to a second vacuum suction pump, which is connected to a second high-speed color mixing machine. A first inkjet printer is located inside the observation box, and a first reinforcing layer monitor is located outside the observation box. A second inkjet printer is located in front of the second vacuum shaping machine.

[0011] Between the planetary cutting machine for the reinforcing layer and the laser marking machine, there is an internal tube expander, an external tube shrinker, and a rapid testing chamber. The outer side of the internal tube expander and the external tube shrinker is equipped with a main unit panel, a mold storage compartment, and a robotic arm. The outer side of the rapid testing chamber is equipped with a pipe-connecting robot, and the interior of the rapid testing chamber is equipped with a burst testing machine.

[0012] The inner tube extruder has an inner tube extruder main panel, an inner tube mold storage compartment, and a mold robotic arm on its side. The first air cooler has an inner tube monitor, a first waste tube segment placement slot, and a first waste tube segment robotic arm on its side. The winding machine has a winding machine main panel, a reinforcing material storage compartment, and a winding machine robotic arm on its side. The coating extruder has a coating extruder main panel, an outer tube mold storage compartment, and an outer tube mold robotic arm on its side. The second air cooler has a second reinforcing layer monitor, a second waste tube segment placement slot, and a second waste tube segment robotic arm on its side. The robot, the inner tube extruder main panel, the inner tube mold storage compartment, the mold robotic arm, the inner tube monitor, the first waste tube segment placement slot, the first waste tube segment robotic arm, the winding machine main panel, the reinforcing material storage compartment, the winding machine robotic arm, the coating extruder main panel, the outer tube mold storage compartment, the outer tube mold robotic arm, the second reinforcing layer monitor, the second waste tube segment placement slot, and the second waste tube segment robotic arm are all connected to a controller via data cables.

[0013] A method for manufacturing a flexible composite pipe for oil gathering and transportation, using any of the flexible composite pipe manufacturing equipment for oil gathering and transportation described above, includes the following steps: Step 1: Preparation work for composite tube manufacturing, specifically including: inputting the inner diameter, wall thickness and outer diameter parameters of the extruded inner tube on the main panel of the inner tube extruder, controlling the mold storage bin to pop out the corresponding mold, and simultaneously controlling the robotic arm to replace the inner tube mold; inputting the type of reinforcing layer material and the number of strand spindles of each winding machine on the main panel of the winding machine, controlling the reinforcing material storage bin to pop out the corresponding reinforcing layer material, and simultaneously controlling the robotic arm of the winding machine to install the reinforcing material spindles; inputting the outer diameter of the reinforcing layer section, the coating layer thickness and the outer diameter of the outer tube on the main panel of the coating extruder, controlling the outer tube mold storage bin to pop out the corresponding mold, and simultaneously controlling the outer tube mold robotic arm to replace the outer tube mold; Step 2: Mix the anti-wax agent and polyimide at a weight ratio of 5:95. After mixing, stir the mixture evenly using a first high-speed mixer at a mixing speed of 20~1000 r / min. Then, use a first vacuum suction pump and a first mixing and feeding machine to separately convey the anti-wax layer mixture and the inner tube layer material to the inner tube extruder. In the multi-layer co-extrusion die head of the inner tube extruder, heat the mixture to 150~250℃ for melting and plasticizing. Extrude the anti-wax layer and inner tube through a multi-layer co-extrusion die, completing the process in a first vacuum setting machine. The forming process involves cooling by water spraying, followed by air drying in the first air cooler. The first air cooler is equipped with an inner tube camera with a resolution of 10-50 megapixels. The camera transmits the outer surface of the inner tube to the inner tube monitor. The inner tube planetary cutter cuts off the defective sections identified by the transmitted video signal. Simultaneously, a robotic arm for the first waste section is used to transport the cut sections to the first waste section placement trough. Once the inner lining tube is deemed qualified, the sections are pulled to the winding machine. Step 3: When the inner tube is pulled to the reinforcing winding section, click to pause the pulling. At the same time, input the tension of the reinforcing layer material (2~30 kg.f), the cutoff (100~500 mm), and the winding angle (15~85°) parameters on the main panel of the winding machine. Control the robot to complete the process settings for each reinforcing filament bundle in sequence. Click to continue pulling. The observation box is equipped with a reinforcing layer camera with a resolution of 10-50 megapixels. The outer surface of the wound reinforcing tube section is transmitted to the first reinforcing layer monitor through the reinforcing layer camera. The first inkjet printer sprays an "X" on the defective tube section and continues to pull to the outer tube covering section. Step 4: The outer tube raw material is stirred by the second high-speed color mixer, and then transported to the die head of the coating extruder by the second vacuum suction pump and the second mixing and feeding machine. It is heated to 150~250℃ for melting and plasticizing. After extrusion, a second inkjet printer is installed on the traction section. Near the coating tube section with an "X" printed on the reinforcement section, another "X" is printed. The forming is completed in the second vacuum setting machine. It is cooled by cooling water spray and then air-dried in the second air cooler. The second air cooler is equipped with a reinforcement layer camera with a resolution of 10-50 million pixels. The reinforcement layer camera transmits the outer surface of the outer tube to the second reinforcement layer monitor. The reinforcement layer planetary cutter cuts off the tube sections that are defective or have an "X" based on the transmitted video signal. At the same time, the second waste tube section robotic arm is used to transport the cut tube sections to the second waste tube section placement tank until the outer tube is deemed qualified. Step 5: Use a laser marking machine to mark the pipe according to the pipe marking standard, and use a traction machine to pull the composite pipe to the composite pipe winding rack to wind up the pipe.

[0014] After the outer pipe is deemed qualified in step 4, pipe cutting is performed. The specific process is as follows: the pipe section is pulled to the connection point of the inner tube expander and outer tube shrinker, traction is paused, and the final inner diameter, wall thickness, and outer diameter parameters of the composite pipe are set on the main control panels of the inner tube expander and outer tube shrinker. The mold storage compartment is controlled to eject the corresponding mold, and simultaneously, the robotic arm is controlled to replace the molds of the inner tube expander and outer tube shrinker. The pipe section connection is completed through the inner tube expander and outer tube shrinker. After pulling to 1.0~1.5m, the pipe section is cut out and the connection of the other end is completed. The traction machine is then paused. The system operates by using a robotic arm to transport the connected composite pipe to the rapid testing chamber. A connecting robot then connects one end of the pipe segment to the burst testing machine using a high-pressure hose, while the other end is sealed with a plug. The burst strength of the composite pipe is rapidly tested in the chamber. Once the burst strength meets the requirements, the traction machine continues operation. The number of pipe segments to be cut every 1.0-1.5 meters is set on the planetary cutter's main panel. The robotic arm continues to connect the pipe segments using traction, an internal expansion machine, and an external shrinking machine, completing the required pipe cutting and connection work.

[0015] The technical advantages of this invention are as follows: 1. By employing a multi-layered composite pipe, with an anti-wax layer on the inner wall of the inner pipe and a reinforcing layer on the outer wall, this invention effectively prevents problems such as oil swelling, wax buildup, and blockage in the pipeline after long-term operation when used in oil gathering and transportation. It exhibits excellent strength and long-term service performance. 2. The manufacturing equipment for the flexible composite pipe used in oil gathering and transportation in this invention utilizes an automated production line, improving the efficiency and labor intensity issues associated with manual winding and traction during the trial production of flexible composite pipes. This achieves automated production, increases production efficiency, and reduces costs. 3. The manufacturing equipment for the flexible composite pipe used in oil gathering and transportation in this invention employs a segmented inspection method, performing quality inspections separately on the inner pipe processing section and the reinforcing layer processing section. Compared to existing composite pipes that are inspected after processing, this significantly improves the accuracy of composite pipe inspection and effectively prevents product defects. 4. The manufacturing equipment for the flexible composite pipe used in oil gathering and transportation in this invention allows for sampling and performance testing during the composite pipe production process, avoiding the limitation of sampling locations on the finished pipe coil and providing a better reflection of product performance.

[0016] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a flexible composite pipe structure for oil gathering and transportation according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of a flexible composite pipe manufacturing equipment for oil gathering and transportation according to an embodiment of the present invention.

[0019] Reference numerals: 1-Anti-wax layer; 2-Inner tube; 3-Reinforcing layer; 4-Outer tube; 21-Inner tube extruder; 211-Inner tube extruder main unit panel; 212-Inner tube mold storage compartment; 213-Mold robotic arm; 22-First high-speed color mixer; 23-First vacuum suction pump; 24-First mixing and feeding machine; 25-First vacuum setting machine; 26-First air cooler; 261-Inner tube monitor; 262-First waste tube segment placement tank; 263-First waste tube segment robotic arm; 27-Inner tube planetary cutter; 28-Winding machine; 281-Winding machine main unit panel; 282-Reinforcing material storage compartment; 283-Winding machine robotic arm; 29-Robot; 30-Traction machine; 31-Observation box; 311-First reinforcing layer monitor; 312-First inkjet printer; 32-Second high-speed color mixer; 33-Second vacuum suction pump; 34-Second mixing and feeding machine; 35-Coating extruder; 351-Coating extruder main unit panel; 352-Outer tube mold storage bin; 353-Outer tube mold robotic arm; 36-Second air cooler; 361-Second reinforcing layer monitor; 362-Second waste pipe section placement trough; 363-Second waste pipe section robotic arm; 37-Reinforcing layer planetary cutter; 38-Internal tube expander; 381-Main unit panel; 382-Mold storage bin; 383-Robotic arm; 39-External tube shrinker; 40-Rapid testing chamber; 41-Connecting robot; 42-Burning test machine; 43-Laser marking machine; 44-Composite tube winding and unwinding rack; 45-Second vacuum shaping machine; 46-Controller. Detailed Implementation

[0020] Example 1 like Figure 1 As shown, a flexible composite pipe for oil gathering and transportation is provided. The composite pipe has a multi-layer structure, including an inner pipe 2. The inner wall of the inner pipe 2 is provided with an anti-wax layer 1. The outer wall of the inner pipe 2 is covered with a reinforcing layer 3. An outer pipe 4 is provided on the outside of the reinforcing layer 3.

[0021] The inner tube 2 is made of one of the following materials: oil-resistant polyethylene, oil-resistant polypropylene, nylon, polyphenylene ether, polyketone, and polyimide.

[0022] The reinforcing layer 3 includes one or more of artificial fibers, steel wires, steel strips, and steel cords. The reinforcing layer 3 is formed by spiral winding or weaving of the artificial fibers, steel wires, steel strips, and steel cords, with a winding angle range of 15~85°.

[0023] The man-made fiber is one or more of polyester fiber, polypropylene fiber, ultra-high molecular weight polyethylene fiber, nylon fiber, carbon fiber, and aramid fiber.

[0024] The ultra-high molecular weight polyethylene fiber, also known as high-strength, high-modulus polyethylene fiber, is a fiber spun from polyethylene with a molecular weight of 1 million to 5 million.

[0025] The thickness of the anti-wax layer 1 is 1mm to 2mm. The anti-wax layer 1 is an oil-repellent polymer layer. The polymer layer is prepared by mixing an anti-wax agent and polyimide in a weight ratio of 5:95. The anti-wax agent includes either Basoflux PI40 / PI41 or Keroflux 3614. When the two are mixed, their weight ratio is 50:50.

[0026] This invention employs a multi-layered composite pipe, with an anti-wax layer on the inner wall of the inner pipe and a reinforcing layer on the outer wall of the inner pipe. This effectively prevents problems such as oil swelling, waxing, and blockage in the pipeline after long-term operation when the composite pipe is used in the field of oil gathering and transportation. It has good strength and long-term service performance.

[0027] Example 2 like Figure 2 As shown, a flexible composite pipe manufacturing equipment for oil gathering and transportation is used to manufacture any of the flexible composite pipes for oil gathering and transportation as described above. It includes an inner tube extruder 21, a first vacuum shaping machine 25, a first air cooler 26, an inner tube planetary cutter 27, a winding machine 28, a traction machine 30, an observation box 31, a coating extruder 35, a second vacuum shaping machine 45, a second air cooler 36, a reinforcing layer planetary cutter 37, a laser marking machine 43, and a composite pipe winding and unwinding rack 44, all arranged coaxially. A first mixing and feeding machine 24 is connected above the inner tube extruder 21. 24 is connected to a first vacuum suction pump 23, the first vacuum suction pump 23 is connected to a first high-speed color mixer 22, a robot 29 is provided on the outside of the winding machine 28, a second mixing and feeding machine 34 is provided above the coating extruder 35, the second mixing and feeding machine 34 is connected to a second vacuum suction pump 33, the second vacuum suction pump 33 is connected to a second high-speed color mixer 32, a first inkjet printer 312 is provided inside the observation box 31, a first reinforcing layer monitor 311 is provided on the outside of the observation box 31, and a second inkjet printer 313 is provided in front of the second vacuum setting machine 45.

[0028] In practical use, this invention mixes the anti-wax agent and polyimide at a weight ratio of 5:95. After mixing, the mixture is stirred evenly by a first high-speed color mixer 22. The anti-wax layer mixture and the inner tube layer material are then transported to the inner tube extruder 21 by a first vacuum suction pump 23 and a first mixing and feeding machine 24. The anti-wax layer 1 and the inner tube 2 are extruded through a multi-layer co-extrusion die. The forming is completed in a first vacuum setting machine 25, cooled by cooling water spray, and then air-dried by a first air cooler 26. Defective tube sections are cut off by an inner tube planetary cutter 27. When the inner tube is pulled to the reinforcing winding section, the control robot 29 sequentially completes the process settings for each reinforcing filament bundle. The traction machine 30 clicks to continue pulling. A reinforcement layer camera with a resolution of 10-50 megapixels is installed on the observation box 31 to record defective tube sections and continue pulling to the outer tube covering section. The mixture is stirred by a second high-speed color mixer 32 and transported by a second vacuum suction pump 33 and a second mixing and feeding machine 24. After the material feeder 34 extrudes the outer pipe raw material, it is formed in the second vacuum shaping machine 45, cooled by cooling water spray, and then dried by air blowing in the second air cooler 36. Defective pipe sections are cut off by the planetary cutting machine 37, and the pipe is marked with a laser marking machine 43 according to the pipe marking standard. The composite pipe is then pulled to the composite pipe winding rack 44 by a traction machine for winding. This invention's flexible composite pipe manufacturing equipment for oil gathering and transportation adopts an automated production line, improving the low efficiency and high labor intensity problems of manual winding and traction during the trial production of flexible composite pipes. It achieves automated production, improves production efficiency, and reduces costs. Furthermore, this invention's flexible composite pipe manufacturing equipment for oil gathering and transportation adopts a segmented inspection method, performing quality inspections separately in the inner pipe processing section and the reinforcing layer processing section. Compared with existing composite pipes that are inspected after processing, this greatly improves the accuracy of composite pipe inspection and effectively prevents defective products. Example 3 Preferably, based on Embodiment 1, in this embodiment, an inner tube expander 38, an outer tube shrinker 39, and a rapid testing chamber 40 are provided between the reinforcing layer planetary cutter 37 and the laser marking machine 43. A main unit panel 381, a mold storage compartment 382, ​​and a robotic arm 383 are provided on the outer side between the inner tube expander 38 and the outer tube shrinker 39. A pipe-connecting robot 41 is provided on the outer side of the rapid testing chamber 40, and a bursting test machine 42 is provided inside the rapid testing chamber 40.

[0029] In actual use, after the outer pipe is deemed qualified, the present invention performs pipe cutting. The pipe section is pulled to the joint connection point of the internal expansion machine 38 and the external shrinking machine 39, and the pulling is paused. The final inner diameter, wall thickness, and outer diameter parameters of the composite pipe are set on the main control panel 381 of the internal expansion machine and the external shrinking machine. The mold storage chamber 382 is controlled to eject the corresponding mold, and the robotic arm 383 is controlled to replace the molds of the internal expansion machine 38 and the external shrinking machine 39. The pipe section joint connection is completed by the internal expansion machine and the external shrinking machine. After being pulled to 1.0~1.5m, the pipe section is cut out and the joint connection at the other end is completed. The pulling machine 30 is temporarily paused. The traction machine stops running, and the connected composite pipe is transported to the rapid testing chamber 40 by the robotic arm 383. The connecting robot 41 then connects one end of the pipe section to the burst testing machine 42 using a high-pressure hose, and seals the other end with a plug. The burst strength of the composite pipe is quickly tested in the rapid testing chamber 40. Once the burst strength meets the requirements, the traction machine is restarted. The number of pipe sections to be cut every 1.0~1.5m is set on the planetary cutter's main panel, and the robotic arm 383 continues to connect the pipe sections using traction, an internal expansion machine, and an external shrinking machine. This completes the required pipe cutting and connection work. This invention's flexible composite pipe manufacturing equipment for oil gathering and transportation allows for sampling and performance testing during the composite pipe production process, avoiding the limitation of sampling locations on finished pipe rolls and providing a better reflection of product performance.

[0030] Example 4 Preferably, based on Embodiment 1, in this embodiment, the inner tube extruder 21 is provided with an inner tube extruder main panel 211, an inner tube mold storage compartment 212, and a mold robotic arm 213 on its side; the first air cooler 26 is provided with an inner tube monitor 261, a first waste tube segment placement slot 262, and a first waste tube segment robotic arm 263 on its side; the winding machine 28 is provided with a winding machine main panel 281, a reinforcing material storage compartment 282, and a winding machine robotic arm 283 on its side; the coating extruder 35 is provided with a coating extruder main panel 351, an outer tube mold storage compartment 352, and an outer tube mold robotic arm 353 on its side; and the second air cooler 36 is provided with a second reinforcing layer monitor 351 on its side. 61. The second waste pipe section placement tank 362 and the second waste pipe section robotic arm 363, the robot 29, the inner tube extruder main panel 211, the inner tube mold storage bin 212, the mold robotic arm 213, the inner tube monitor 261, the first waste pipe section placement tank 262, the first waste pipe section robotic arm 263, the winding machine main panel 281, the reinforcing material storage bin 282, the winding machine robotic arm 283, the coating extruder main panel 351, the outer tube mold storage bin 352, the outer tube mold robotic arm 353, the second reinforcing layer monitor 361, the second waste pipe section placement tank 362 and the second waste pipe section robotic arm 363 are respectively connected to the controller 46 via data cables.

[0031] In practical use, this invention allows the inner diameter, wall thickness, and outer diameter parameters of the extruded inner tube to be input on the main panel 211 of the inner tube extruder. This controls the inner tube mold storage bin 212 to eject the corresponding mold, while simultaneously controlling the robotic arm 213 to replace the inner tube mold. Similarly, the type of reinforcing layer material and the number of stranded spindles per winding machine 28 are input on the main panel 281 of the winding machine. This controls the reinforcing material storage bin 282 to eject the corresponding reinforcing layer material, while simultaneously controlling the robotic arm 283 to install the reinforcing material spindles. Finally, the outer diameter of the reinforcing layer section, the coating layer thickness, and the outer tube outer diameter are input on the main panel 351 of the coating extruder. This controls the outer tube mold storage bin 352 to eject the corresponding mold, while simultaneously controlling the robotic arm 353 to replace the outer tube mold.

[0032] Example 5 A method for manufacturing a flexible composite pipe for oil gathering and transportation, using any of the flexible composite pipe manufacturing equipment for oil gathering and transportation described above, includes the following steps: Step 1: Preparation work for composite tube manufacturing, specifically including: inputting the inner diameter, wall thickness and outer diameter parameters of the extruded inner tube on the main panel 211 of the inner tube extruder, controlling the inner tube mold storage bin 212 to pop out the corresponding mold, and simultaneously controlling the robotic arm 213 to replace the inner tube mold; inputting the type of reinforcing layer material and the number of stranded spindles in each winding machine 28 on the main panel 281 of the winding machine, controlling the reinforcing material storage bin 282 to pop out the corresponding reinforcing layer material, and simultaneously controlling the robotic arm 283 of the winding machine to install the reinforcing material spindles; inputting the outer diameter of the reinforcing layer section, the coating layer thickness and the outer diameter of the outer tube on the main panel 351 of the coating extruder, controlling the outer tube mold storage bin 352 to pop out the corresponding mold, and simultaneously controlling the outer tube mold robotic arm 353 to replace the outer tube mold; Step 2: Mix the anti-wax agent and polyimide at a weight ratio of 5:95. After mixing, stir the mixture evenly using a first high-speed mixer 22 at a mixing speed of 20~1000 r / min. The anti-wax layer mixture and the inner tube layer material are then fed to the inner tube extruder 21 via a first vacuum suction pump 23 and a first mixing and feeding machine 24. The mixture is heated to 150~250℃ in the multi-layer co-extrusion die head of the inner tube extruder 21 for melting and plasticizing. The anti-wax layer 1 and the inner tube 2 are then extruded through a multi-layer co-extrusion die. The final product is completed in a first vacuum setting machine 25. The tube is cooled by spraying cooling water and then dried by air cooling in the first air cooler 26. The first air cooler 26 is equipped with an inner tube camera with a resolution of 10-50 million pixels. The inner tube camera transmits the outer surface of the inner tube to the inner tube monitor 261. The inner tube planetary cutter 27 cuts off the tube segments that are judged to be defective by the transmitted video signal. At the same time, the first waste tube segment robotic arm 263 is used to transport the cut tube segments to the first waste tube segment placement tank 262. After the inner lining tube is judged to be qualified, the tube segments are pulled to the winding machine 28. Step 3: When the inner tube is pulled to the reinforcing winding section, click to pause the pulling. At the same time, input the tension of the reinforcing layer material (2~30 kg.f), the cutoff (100~500 mm), and the winding angle (15~85°) on the main panel 281 of the winding machine. Control the robot 29 to complete the process settings for each reinforcing filament bundle in sequence. The pulling machine 30 clicks to continue pulling. The observation box 31 is equipped with a reinforcing layer camera with a resolution of 10 million to 50 million pixels. The outer surface of the wound reinforcing tube section is transmitted to the first reinforcing layer monitor 311 through the reinforcing layer camera. The first inkjet printer 312 sprays an "X" on the defective tube section and continues to pull to the outer tube covering section. Step 4: The outer tube raw material is stirred by the second high-speed color mixer 32, and then transported to the die head of the coating extruder 31 by the second vacuum suction pump 33 and the second mixing and feeding machine 34. It is heated to 150~250℃ for melting and plasticizing. After extrusion, a second inkjet printer 313 is installed on the traction section. Near the coating tube section with an "X" printed on the reinforcement section, another "X" is printed. The forming is completed in the second vacuum shaping machine 45. It is cooled by cooling water spray and then air-dried in the second air cooler 36 by blowing in air. The second air cooler 36 is equipped with a reinforcement layer camera with a resolution of 10 million to 50 million pixels. The reinforcement layer camera transmits the outer surface of the reinforcement layer to the second reinforcement layer monitor 361. The reinforcement layer planetary cutter 37 cuts off the tube sections that are defective or have an "X" according to the transmitted video signal. At the same time, the second waste tube section robotic arm 363 is used to transport the cut tube sections to the second waste tube section placement tank 362 until the outer tube is judged to be qualified. Step 5: Use laser marking machine 43 to mark the pipe according to the pipe marking standard, and use the traction machine to pull the composite pipe to the composite pipe winding and unwinding frame 44 to wind up the pipe.

[0033] After the outer pipe is deemed qualified in step 4, pipe cutting is performed. The specific process is as follows: the pipe section is pulled to the joint of the inner tube expander 38 and the outer tube shrinker 39, the pulling is paused, the final inner diameter, wall thickness and outer diameter parameters of the composite pipe are set on the main panel 381 of the inner tube expander and the outer tube shrinker, the mold storage bin 382 is controlled to pop out the corresponding mold, and the robotic arm 383 is controlled to replace the mold of the inner tube expander 35 and the outer tube shrinker 36. The pipe section joint is connected by the inner tube expander and the outer tube shrinker. After pulling to 1.0~1.5m, the pipe section is cut out and the joint connection of the other end is completed. The pulling machine 30 is paused. The traction machine operates, using robotic arm 383 to transport the connected composite pipe to rapid testing chamber 40. It then controls pipe-connecting robot 41 to connect one end of the pipe segment to burst testing machine 42 using a high-pressure hose, sealing the other end with a plug. In rapid testing chamber 40, the burst strength of the composite pipe is quickly tested. Once the burst strength meets the requirements, the traction machine is activated to continue operation. The number of pipe segments to be cut every 1.0~1.5m is set on the planetary cutter's main panel, and robotic arm 383 continues to be controlled to complete the pipe segment joint connection through traction and internal expansion and external shrinking machines, thus completing the required pipe cutting and joint connection work.

[0034] Example 6 The manufacturing method for a flexible composite pipe for oil gathering and transportation as described in Example 5, and the manufacturing equipment for a flexible composite pipe for oil gathering and transportation as described in Example 2, are used to manufacture a DN50 12MPa flexible composite pipe for oil gathering and transportation. The specific process is as follows: Step 1: Preparation work for the fabrication of DN50 12MPa flexible composite oil gathering and transportation pipe, specifically including: inputting the inner diameter, wall thickness and outer diameter parameters of the extruded inner tube on the main panel 211 of the inner tube extruder, controlling the mold storage chamber 212 to pop out the corresponding mold, and simultaneously controlling the robotic arm 213 to replace the inner tube mold; inputting the type of reinforcing layer material and the number of stranded spindles of each winding machine 28 on the main panel 281 of the winding machine, controlling the reinforcing material storage chamber 282 to pop out the corresponding reinforcing layer material, and simultaneously controlling the winding machine robotic arm 283 to install the reinforcing material spindles; inputting the outer diameter of the reinforcing layer section, the coating layer thickness and the outer diameter of the outer tube on the main panel 351 of the coating extruder, controlling the outer tube mold storage chamber 352 to pop out the corresponding mold, and simultaneously controlling the outer tube mold robotic arm 353 to replace the outer tube mold; Step 2: Mix the anti-wax agent and polyimide at a weight ratio of 5:95. After mixing, stir the mixture evenly using a first high-speed mixer 22 at a mixing speed of 20~1000 r / min. Then, use a first vacuum suction pump 23 and a first mixing and feeding machine 24 to separately transport the anti-wax layer mixture and the inner tube layer material to the inner tube extruder 21. In the multi-layer co-extrusion die head of the inner tube extruder 21, heat the mixture to 150~250℃ for melting and plasticizing. Extrude the anti-wax layer 1 and the inner tube 2 through a multi-layer co-extrusion die, controlling the wall thickness of the anti-wax layer 1 to 1mm~2mm. Then, use a first vacuum pump 23 and a first mixing and feeding machine 24 to extrude the mixture. The molding completed in the molding machine 25 is cooled by cooling water spray, and then air-dried and cooled by the first air cooler 26. The first air cooler 26 is equipped with an inner tube camera with a resolution of 10-50 million pixels. The inner tube camera transmits the outer surface of the inner tube to the inner tube monitor 261. The inner tube planetary cutter 27 cuts off the tube segments that are judged to be defective by the transmitted video signal. At the same time, the first waste tube segment robotic arm 263 is used for online control to transport the cut tube segments to the first waste tube segment placement tank 262. After the inner lining tube is judged to be qualified, the tube segments are pulled to the winding machine 28. Step 3: When the inner tube is pulled to the reinforcing winding section, click to pause traction. At the same time, input the tension of the reinforcing layer material (2~30 kg.f, cutoff 100~500 mm, and winding angle 15~85°) into the main panel 281 of the winding machine. Wind 2, 4, 6, 8, ... 16 layers in each direction, with 30~60 polyester fibers per layer. Click to continue traction on the traction machine 30. The observation box 31 is equipped with a reinforcing layer camera with a resolution of 10-50 megapixels. The outer surface of the wound reinforcing tube section is transmitted to the first reinforcing layer monitor 311 through the reinforcing layer camera. The first inkjet printer 312 sprays an "X" on the defective tube section and continues to pull to the outer tube covering section. Step 4: The high-density polyethylene or polypropylene raw material for the outer tube is stirred by the second high-speed color mixer 32, and then conveyed to the die head of the coating extruder 31 by the second vacuum suction pump 33 and the second mixing and feeding machine 34. The material is heated to 150~250℃ for melting and plasticizing, achieving a coating thickness of 3mm~4mm. After extrusion, a second inkjet printer 313 is installed on the traction section. Near the coated tube section where an "X" is printed on the reinforcing section, another "X" is printed. The forming is completed in the second vacuum setting machine 45, controlling the vacuum degree to 0.02~0.08MPa. The material is then cooled... After being cooled by water spray, the pipe is then dried and cooled by air blowing in the second air cooler 36. The second air cooler 36 is equipped with an enhancement layer camera with a resolution of 10-50 megapixels. The outer surface of the outer pipe is transmitted to the second enhancement layer monitor 361 through the enhancement layer camera. The enhancement layer planetary cutter 37 cuts off the pipe sections that are found to be defective or have an "X" mark based on the transmitted video signal. At the same time, the second waste pipe section robotic arm 363 is used for online control to transport the cut pipe sections to the second waste pipe section placement tank 362 until the outer pipe is deemed qualified. Step 5: Use laser marking machine 43 to mark the pipe according to the pipe marking standard, marking the pipe model, standard, production date and length information. Use traction machine to pull the composite pipe to composite pipe winding rack 44 to wind up the pipe, and complete the preparation of ND50 12MPa flexible composite pipe for oil gathering and transportation.

[0035] Samples of the prepared DN50 12MPa flexible composite oil gathering and transportation pipe were taken for media compatibility evaluation. The evaluation conditions were 70℃, 9.5MPa N2, 0.5MPa CO2, 60%vol No. 0 diesel oil, and 10%vol deionized water. The aging evaluation lasted for more than 90 days. The length change rate was 0~2%, the mass change rate was -5%~5%, the tensile breaking strength change rate was -20%~20%, the elongation change rate was -30%~30%, and the elastic modulus change rate was -20%~20%.

[0036] Samples of the prepared DN50 12MPa flexible composite oil gathering and transportation pipe were taken for performance testing and evaluation. Longitudinal shrinkage rate: <3%; Pressure crack stability: no cracks; Room temperature hydrostatic strength: no leakage and pressure drop <4% after holding at 24MPa for 1 hour; Room temperature burst strength >36MPa; 65℃ hydrostatic strength: no leakage and pressure drop <4% after holding at 18MPa for 4 hours; 65℃ burst strength >36MPa; 1000-hour survival test: minimum bending radius and burst strength >36MPa; Gas tightness: no leakage or seepage; At 65℃ and 25MPa pressure, after holding for 1000 hours, the pipe showed no rupture or leakage.

[0037] In summary, the evaluation results show that the DN50 12MPa flexible composite oil gathering and transportation pipe meets the requirements of SY / T6662.2-2020 and SY / T6794-2010 standards and has good strength and long-term service performance.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A flexible composite pipe for oil gathering and transportation, characterized in that: The composite tube has a multi-layer structure, including an inner tube (2). The inner wall of the inner tube (2) is provided with an anti-wax layer (1). The outer wall of the inner tube (2) is covered with a reinforcing layer (3). An outer tube (4) is provided on the outside of the reinforcing layer (3). The thickness of the anti-wax layer (1) is 1 mm to 2 mm. The anti-wax layer (1) is an oil-repellent polymer layer. The polymer layer is prepared by mixing an anti-wax agent and polyimide. The weight ratio of the two is 5:

95. The anti-wax agent includes Basoflux PI40 / PI41 and Keroflux 3614 or one of them. When the two anti-wax agents are mixed, the weight ratio of the two is 50:

50.

2. The flexible composite pipe for oil gathering and transportation according to claim 1, characterized in that: The inner tube (2) is made of one of the following materials: oil-resistant polyethylene, oil-resistant polypropylene, nylon, polyphenylene ether, polyketone, and polyimide.

3. The flexible composite pipe for oil gathering and transportation according to claim 1, characterized in that: The reinforcing layer (3) includes one of artificial fibers, steel wires, steel strips, and steel cords. The reinforcing layer (3) is formed by spiral winding or weaving the artificial fibers, steel wires, steel strips, and steel cords, with the winding or weaving angle ranging from 15° to 85°.

4. The flexible composite pipe for oil gathering and transportation according to claim 3, characterized in that: The man-made fiber is one of polyester fiber, polypropylene fiber, ultra-high molecular weight polyethylene fiber, nylon fiber, carbon fiber, and aramid fiber.

5. A method for manufacturing a flexible composite pipe for oil gathering and transportation, comprising manufacturing a flexible composite pipe for oil gathering and transportation as described in any one of claims 1 to 4, characterized in that: A flexible composite pipe manufacturing equipment for oil gathering and transportation is used. The equipment includes an inner tube extruder (21) coaxially arranged, a first vacuum shaping machine (25), a first air cooler (26), an inner tube planetary cutter (27), a winding machine (28), a traction machine (30), an observation box (31), a coating extruder (35), a second vacuum shaping machine (45), a second air cooler (36), a reinforcing layer planetary cutter (37), a laser marking machine (43), and a composite pipe winding rack (44). A first mixing and feeding machine (24) is connected above the inner tube extruder (21). The first mixing and feeding machine (24) is connected to a first vacuum suction pump (23). The first vacuum suction pump (23) is connected to a first high-speed mixer. Coloring machine (22), a robot (29) is provided outside the winding machine (28), a second mixing and feeding machine (34) is provided above the coating extruder (35), the second mixing and feeding machine (34) is connected to a second vacuum suction pump (33), the second vacuum suction pump (33) is connected to a second high-speed color mixing machine (32), a first inkjet printer (312) is provided inside the observation box (31), a first reinforcing layer monitor (311) is provided outside the observation box (31), a second inkjet printer (313) is provided in front of the second vacuum shaping machine (45), an internal tube expander (38), an external tube shrinker (39) and a rapid testing chamber (4) are provided between the reinforcing layer planetary cutter (37) and the laser marking machine (43). 0), the main unit panel (381), mold storage compartment (382) and robotic arm (383) are provided on the outer side between the inner tube expander (38) and the outer tube shrinker (39), the rapid testing chamber (40) is provided with a pipe-connecting robot (41) on the outer side, the rapid testing chamber (40) is provided with a burst testing machine (42) inside, the inner tube extruder (21) is provided with an inner tube extruder main unit panel (211), inner tube mold storage compartment (212) and mold robotic arm (213) on the side, the first air cooler (26) is provided with an inner tube monitor (261), a first waste pipe section placement trough (262) and a first waste pipe section robotic arm (263) on the side, and the winding machine (28) is provided with a winding machine main unit panel on the side. (281), reinforcement material storage bin (282) and winding machine robotic arm (283), the side of the coating extruder (35) is provided with coating extruder main panel (351), outer tube mold storage bin (352) and outer tube mold robotic arm (353), the side of the second air cooler (36) is provided with second reinforcement layer monitor (361), second waste pipe section placement slot (362) and second waste pipe section robotic arm (363), the robot (29), inner tube extruder main panel (211), inner tube mold storage bin (212), mold robotic arm (213), inner tube monitor (261), first waste pipe section placement slot (262) and first waste pipe section robotic arm (263).The main panel of the winding machine (281), the reinforcing material storage bin (282), the winding machine robotic arm (283), the main panel of the coating extruder (351), the outer tube mold storage bin (352), the outer tube mold robotic arm (353), the second reinforcing layer monitor (361), the second waste tube section placement trough (362), and the second waste tube section robotic arm (363) are respectively connected to a controller (46) via data cables. The manufacturing method includes the following steps: Step 1: Preparation work for composite tube preparation, specifically including: inputting the inner diameter, wall thickness and outer diameter parameters of the extruded inner tube on the main panel (211) of the inner tube extruder, controlling the inner tube mold storage bin (212) to pop out the corresponding mold, and controlling the robotic arm (383) to replace the inner tube mold; inputting the type of reinforcing layer material and the number of stranded spindles of each winding machine (28) on the main panel (281) of the winding machine, controlling the reinforcing material storage bin (282) to pop out the corresponding reinforcing layer material, and controlling the robotic arm (283) of the winding machine to install the reinforcing material spindle; inputting the outer diameter of the reinforcing layer section, the coating layer thickness and the outer diameter of the outer tube on the main panel (351) of the coating extruder, controlling the outer tube mold storage bin (352) to pop out the corresponding mold, and controlling the outer tube mold robotic arm (353) to replace the outer tube mold. Step 2: Mix the anti-wax agent and polyimide at a weight ratio of 5:

95. After mixing, stir and mix evenly using the first high-speed color mixer (22) at a mixing rate of 20~1000r / min. The anti-wax layer mixture and the inner tube layer material are transported to the inner tube extruder (21) by the first vacuum suction pump (23) and the first mixing feeder (24). The mixture is heated to 150~250℃ in the multi-layer co-extrusion die head of the inner tube extruder (21) for melting and plasticization. The anti-wax layer (1) and the inner tube (2) are extruded through the multi-layer co-extrusion die and completed in the first vacuum setting machine (25). The tube is formed and cooled by spraying cooling water, and then dried by air in the first air cooler (26). The first air cooler (26) is equipped with an inner tube camera with a resolution of 10 million to 50 million pixels. The inner tube camera transmits the outer surface of the inner tube to the inner tube monitor (261). The inner tube planetary cutter (27) cuts off the tube segments that are judged to be defective by the transmitted video signal. At the same time, the first waste tube segment robotic arm (263) is used to transport the cut tube segments to the first waste tube segment placement tank (262) until the inner lining tube is judged to be qualified. Then the tube segments are pulled to the winding machine (28). Step 3: When the inner tube is pulled to the reinforcing winding section, click to pause the pulling. At the same time, input the tension of the reinforcing layer material (2~30 kg.f, the cutoff pitch (100~500 mm) and the winding angle (15~85°) on the main panel (281) of the winding machine. Control the robot (29) to complete the process settings of each reinforcing filament in sequence. The traction machine (30) clicks to continue pulling. The observation box (31) is equipped with a reinforcing layer camera with a resolution of 10 million to 50 million pixels. The outer surface of the wound reinforcing tube section is transmitted to the first reinforcing layer monitor (311) through the reinforcing layer camera. The first inkjet printer (312) sprays an "X" on the defective tube section and continues to pull to the outer tube covering section. Step 4: The outer tube raw material is stirred by the second high-speed color mixer (32), and then transported to the die head of the coating extruder (35) by the second vacuum suction pump (33) and the second mixing and feeding machine (34) and heated to 150~250℃ for melting and plasticizing. After extrusion, a second inkjet printer (313) is installed on the traction section. Near the coating tube section with the "X" printed on it in the reinforcing section, another "X" is printed. The molding is completed in the second vacuum shaping machine (45), cooled by cooling water spray, and then passed through the second air cooler (36). Air is blown in for drying and cooling. A 10-50 million pixel resolution enhancement layer camera is installed in the second air cooler (36). The outer surface of the outer tube is transmitted to the second enhancement layer monitor (361) through the enhancement layer camera. The tube segment that is defective or has an "X" is cut off by the enhancement layer planetary cutter (37) based on the transmitted video signal. At the same time, the second waste tube segment robotic arm (363) is used to transport the cut tube segment to the second waste tube segment placement tank (362) until the outer tube is deemed qualified. Step 5: Use a laser marking machine (43) to mark the pipe according to the pipe marking standard, and use a traction machine to pull the composite pipe to the composite pipe winding and unwinding rack (44) to wind up the pipe.

6. The manufacturing method of a flexible composite pipe for oil gathering and transportation according to claim 5, characterized in that: After the outer pipe is deemed qualified in step 4, pipe cutting and testing are performed. The specific process is as follows: the pipe section is pulled to the joint connection of the inner tube expander (38) and the outer tube shrinker (39), the pulling is paused, the final inner diameter, wall thickness and outer diameter parameters of the composite pipe are set on the main panel (381) of the inner tube expander and the outer tube shrinker, the mold storage bin (382) is controlled to pop out the corresponding mold, and the robotic arm (383) is controlled to replace the mold of the inner tube expander (38) and the outer tube shrinker (39), the pipe section joint connection is completed through the inner tube expander and the outer tube shrinker, the pipe section is cut out after being pulled to 1.0~1.5m and the joint connection of the other end is completed, and the pulling machine (30) is pulled out. The traction machine is paused, and the connected composite pipe is transported to the rapid testing chamber (40) by the robotic arm (383). The pipe-connecting robot (41) is controlled to connect one end of the pipe section to the burst testing machine (42) with a high-pressure hose, and the other end is sealed with a plug. The burst strength of the composite pipe is quickly tested in the rapid testing chamber (40). After the burst strength meets the requirements, the traction machine is clicked to continue running. The number of pipe sections cut every 1.0~1.5m is set on the main panel of the planetary cutter, and the robotic arm (383) is controlled to complete the pipe section joint connection through traction and internal expansion machine and external shrinking machine, and the required pipe sample and joint connection work is completed.

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