Double-solenoid type coiled tubing damage detection device

Abstract

The invention provides a double-solenoid type coiled tubing damage detection device. The detection device comprises a data acquisition card, a damage detection module, a centering follow-up speed measurement module and an ovality and wall thickness detection module, the damage detection module, the centering follow-up speed measurement module and the ovality and wall thickness detection module are arranged on the coiled tubing; the damage detection module comprises magnetization equipment and detection equipment, and the detection equipment is arranged between the magnetization equipment; the magnetizing device comprises a solenoid; the detection equipment comprises a Hall probe, a guide rail and a pulley, the pulley, the Hall probe and the guide rail are arranged in the circumferential direction of the coiled tubing, the pulley is tightly attached to the coiled tubing, a distance is kept between the Hall probe and the coiled tubing, and the Hall probe can move in the guide rail; the centering follow-up speed measurement module comprises an encoder and a speed measurement roller in contact with the coiled tubing; the ovality and wall thickness detection module detects the ovality and the wall thickness of the coiled tubing. The method has the beneficial effect that the stress distortion area of the coiled tubing can be accurately detected and identified.

Description

Technical Field

[0001] This invention relates to the field of petroleum equipment manufacturing and non-destructive testing technology, specifically to a double-helix coiled tubing damage detection device. Background Technology

[0002] Coiled tubing (CT) is a continuous tubing system, ranging from hundreds to thousands of meters in length, made up of many flexible tubes, each hundreds of meters long, welded together using butt welding or bevel welding techniques. It offers advantages such as small diameter, high flexibility, low cost, high efficiency, time savings, and reduced formation damage, and is currently widely used in oil and gas field workover, drilling, completion, logging, oil production, gathering and transportation, and enhanced production operations. However, under the combined effects of high pressure, frequent bending and straightening, and axial tension, coiled tubing is prone to early microscopic fatigue plastic deformation, forming stress distortion zones. As plastic deformation accumulates, it eventually leads to sudden failure. With the increase in deep shale gas and sulfur-containing wells, the failure rate of coiled tubing has climbed from 5.8% to approximately 25% in the past three years, posing a significant challenge to operational risk control and maintenance costs. Fatigue failure is one of the main causes of coiled tubing damage. For example, from 2020 to August 2023, a coiled tubing company used 65 coiled tubing rolls, of which 52 rolls failed due to normal fatigue and 13 rolls failed due to abnormal failure. With the continuous increase in operating pressure, the fatigue life of coiled tubing decreases significantly; the fatigue life at a circulating pressure of 65 MPa is 48.65% lower than that at 50 MPa.

[0003] Meanwhile, various types of defects can exist in coiled tubing, such as corrosion, cracks, mechanical damage, pitting, and other physical defects. The appearance of defects can significantly shorten the service life of coiled tubing, and in severe cases, even lead to downhole accidents. If defects can be detected in a timely manner using detection methods, and measures such as removal or disposal can be taken, the service life of the tubing can be effectively extended, and the occurrence of accidents can be greatly reduced. Therefore, providing a double-helix coiled tubing damage detection device is of great significance.

[0004] Chinese patent application number CN202110993119.3, entitled "A Device and Method for Omnidirectional Defect Detection of Coiled Tubing," discloses a device for omnidirectional defect detection of coiled tubing. This device uses a composite probe excitation source of ACFM and MFL to induce a uniform electromagnetic field on the surface of the coiled tubing, acquiring magnetic field distortion signals caused by surface defects. The ACFM array probe detects axial defects in the coiled tubing through eddy current field distortion, while the MFL array probe detects circumferential defects through magnetic field leakage. An encoder synchronously acquires the distance of the corresponding coiled tubing movement. A signal processing module acquires, processes, and intelligently identifies defects using the magnetic field distortion digital signal, finally displaying the defect detection results visually. This overcomes the limitations of single-method directional detection and enables a comprehensive evaluation of the condition of the coiled tubing. However, the structure of this device differs from that of this application. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to solve one or more problems existing in the prior art. For example, one objective of this invention is to provide a twin-helix coiled tubing damage detection device capable of accurately detecting and identifying stress distortion regions in coiled tubing.

[0006] To achieve the above objectives, the present invention provides a double-helix type coiled tubing damage detection device. The detection device may include: a data acquisition card, a damage detection module, a centering follow-up speed measurement module, and an ellipticity and wall thickness detection module. The damage detection module, centering follow-up speed measurement module, and ellipticity and wall thickness detection module are mounted on the coiled tubing. The damage detection module includes a magnetizing device and a detection device, with the detection device positioned between two sets of magnetizing devices. The magnetizing device includes a solenoid that uniformly magnetizes the coiled tubing. The detection device detects defects and early stress distortion areas in the coiled tubing. The detection device includes a Hall effect probe and a guide rail. The system includes a pulley system, which is arranged circumferentially along the coiled tubing and in close contact with it; a Hall effect probe is also arranged circumferentially along the coiled tubing and maintains a certain distance from it; a guide rail is also arranged circumferentially along the coiled tubing, allowing the Hall effect probe to move within the guide rail and maintain the same lift-off value with coiled tubing of different diameters; the surface formed by the Hall effect probe, guide rail, and pulley is perpendicular to the coiled tubing; a centering and follow-up speed measurement module includes a speed measuring roller and an encoder, with the speed measuring roller in direct contact with the coiled tubing, and the encoder connected to the speed measuring roller and the data acquisition card; and an ellipticity and wall thickness detection module that can detect the ellipticity and wall thickness of the coiled tubing in real time.

[0007] According to one or more exemplary embodiments of one aspect of the present invention, the solenoid may be wrapped around a continuous tubing and maintained at a certain distance from it.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the detection device may be provided with a plurality of Hall probes, and each circle may be provided with a plurality of Hall probes.

[0009] According to one or more exemplary embodiments of one aspect of the present invention, the detection device may further include a second spring and a probe holder; wherein the probe holder is arranged along the circumferential direction of the continuous tubing and connected to the pulley, and the Hall probe is disposed in the probe holder; a guide rail is connected to the probe holder; and the second spring is disposed at one end of the guide rail away from the pulley.

[0010] Furthermore, the detection device may also include clamping blocks and baffles, with the baffles arranged circumferentially along the direction of the second spring to form a continuous surface, and the clamping blocks may be disposed on opposite sides of the baffles.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, the centering follow-up speed measuring module may further include a speed measuring wheel, a connecting shaft, a movable support frame and a first spring, wherein the first spring is mounted on the speed measuring wheel and is connected to the speed measuring roller; one end of the connecting shaft is connected to the speed measuring roller, and the other end passes through the movable support frame and is connected to the encoder; the encoder is located on the side wall of the movable support frame.

[0012] Furthermore, the encoder may include a rotary encoder.

[0013] According to one or more exemplary embodiments of one aspect of the present invention, the ellipticity and wall thickness detection module may include a probe support frame, an electromagnetic ultrasonic thickness measuring probe, and a laser profile probe; the probe support frame is sleeved on the continuous tubing, and multiple sets of electromagnetic ultrasonic thickness measuring probes and laser profile probes are arranged on the inner wall of the probe support frame.

[0014] Furthermore, the ellipticity and wall thickness detection module may also include a probe baffle, which is arranged circumferentially along the probe support frame to form a continuous surface.

[0015] According to one or more exemplary embodiments of one aspect of the present invention, the detection device may further include a heat dissipation module; the heat dissipation module is located above and below the continuous oil pipe.

[0016] Furthermore, the heat dissipation module may include a fan.

[0017] According to one or more exemplary embodiments of one aspect of the present invention, the detection device may include a housing, in which a pipeline channel is provided, a continuous oil pipe is provided through the pipeline channel, and a data acquisition card, a damage detection module, a centering follow-up speed measurement module, and an ellipticity and wall thickness detection module are all disposed in the housing.

[0018] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0019] (1) This invention can accurately detect the speed, displacement, ellipticity and pipe wall thickness of coiled tubing of different diameters in real time, helping users to understand the performance status of coiled tubing in the most intuitive way, and providing a scientific basis for analyzing the failure and scrapping of coiled tubing.

[0020] (2) The present invention can detect various physical defects such as corrosion, cracks, mechanical damage, and pitting of coiled tubing strings, and at the same time realize early warning of stress distortion areas.

[0021] (3) By accurately detecting and identifying the stress distortion region, the present invention can detect the risk of coiled tubing failure in the early stage of fatigue failure, providing support for the prediction of the remaining life of coiled tubing and the decision-making on its use. It can further improve the accuracy of the prediction of the remaining life of coiled tubing, ensure the safety of coiled tubing operation, and reduce the cost of use and maintenance. Attached Figure Description

[0022] The above and other objects and features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 A schematic diagram of the structure of the double-helix coiled tubing damage detection device of the present invention is shown.

[0024] Figure 2 A schematic diagram of the damage detection module's detection equipment structure is shown.

[0025] Figure 3 A schematic diagram of the centering follow-up speed measurement module is shown.

[0026] Figure 4 A schematic diagram of the ellipticity and wall thickness detection module is shown.

[0027] Explanation of key figure labels:

[0028] 1-Box housing, 2-Data acquisition card, 3-Heat dissipation module, 4-Centering follow-up speed measurement module, 5-Continuous oil pipe, 6-Solenoid, 7-Damage detection module, 8-Ellipticity and wall thickness detection module, 9-First spring, 10-Connecting shaft, 11-Modible support frame, 12-Encoder, 13-Speed ​​measuring wheel, 14-Speed ​​measuring roller, 15-Clamping block, 16-Baffle, 17-Second spring, 18-Guide rail, 19-Pulley, 20-Probe fixing frame, 21-Fixing plate, 22-Probe baffle, 23-Electromagnetic ultrasonic thickness measuring probe, 24-Laser profile probe, 25-Probe support frame. Detailed Implementation

[0029] In the following, a twin-helix coiled tubing damage detection device of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0030] In the description of this application, it should be understood that the terms “middle,” “upper,” “lower,” “left,” “right,” “top,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first," "second," etc., are used merely for ease of description and distinction, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" or "several" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Exemplary Example 1

[0034] This exemplary embodiment provides a dual-helix type continuous tubing damage detection device.

[0035] Figure 1 A schematic diagram of the structure of the double-helix coiled tubing damage detection device of the present invention is shown. Figure 2 A schematic diagram of the damage detection module's detection equipment structure is shown. Figure 3 A schematic diagram of the centering follow-up speed measurement module is shown. Figure 4 A schematic diagram of the ellipticity and wall thickness detection module is shown below. Figures 1 to 4 This exemplary embodiment describes a dual-helix coiled tubing damage detection device.

[0036] like Figures 1-4 As shown in the exemplary embodiment, the damage detection device for a twin-helix coiled tubing may include: a data acquisition card 2, a damage detection module 7, a centering follow-up speed measurement module 4, and an ellipticity and wall thickness detection module 8.

[0037] The damage detection module 7, the centering follow-up velocity measurement module 4, and the ellipticity and wall thickness detection module 8 are mounted on the coiled tubing 5. The damage detection module 7 includes a magnetizing device and a detection device, with the detection device positioned between two sets of magnetizing devices. The magnetizing device can uniformly magnetize the coiled tubing 5 under test; the magnetizing device may include a solenoid 6. The detection device can detect defects and early stress distortion areas in the coiled tubing 5. The detection device is adaptable to coiled tubing of different diameters. The detection device includes a Hall probe, a guide rail 18, and a pulley 19. The pulley 19 is arranged circumferentially along the coiled tubing 5 and is in close contact with it. The Hall probe is arranged circumferentially along the coiled tubing 5 and maintains a certain distance from it. The guide rail 18 is also arranged circumferentially along the coiled tubing 5. The Hall probe can move within the guide rail and maintain the same lift-off value (distance between the Hall probe and the coiled tubing) with different diameters. The surface formed by the Hall probe, guide rail, and pulley is perpendicular to the coiled tubing. The centering and follow-up speed measurement module 4 includes a speed measuring roller 14 (measuring roller) and an encoder 12. The speed measuring roller 14 is in direct contact with the continuous tubing 5. Direct contact facilitates the positioning of the continuous tubing 5, and the displacement of the continuous tubing 5 is converted into the number of rotations of the speed measuring roller 14. The encoder 12 is connected to the speed measuring roller 14 and to the data acquisition card 2. The encoder 12 can measure the speed and displacement of the continuous tubing 5 under test, and the data can be stored through the data acquisition card 2. The ellipticity and wall thickness detection module 8 can detect the ellipticity and wall thickness of the continuous tubing 5 in real time.

[0038] In this exemplary embodiment, the solenoid is wound around the continuous tubing and maintained at a certain distance from it. For example, this distance can be approximately 10 to 15 mm. The solenoid ensures controllable and rapid magnetization.

[0039] Furthermore, the solenoid may include a high-uniformity energized solenoid (uniformity 0.1–1%). Two high-uniformity energized solenoids are distributed on the left and right sides of the magnetizing device, surrounding the continuous oil tubing under test. Here, the solenoids are arranged separately so that the probe will not be affected by excessive temperature after continuous energization.

[0040] In this exemplary embodiment, the detection device may be provided with several rings of Hall probes arranged adjacent to each other, for example, two rings. Each ring may have multiple Hall probes, for example, nine.

[0041] In this exemplary embodiment, as Figure 2As shown, the testing equipment may further include a second spring 17 and a probe holder 20. The probe holder 20 is arranged along the circumferential direction of the coiled tubing, with one end connected to a pulley 19 and the other end connected to a guide rail 18. The Hall effect probe may be located within the probe holder 20. The second spring 17 is disposed at the end of the guide rail 18 opposite to the pulley 19. The surface formed by the probe holder, guide rail, pulley, and second spring is perpendicular to the length direction of the coiled tubing; on this surface, the pulley, probe holder, guide rail, and second spring may be arranged sequentially in the radial direction. Here, the second spring is provided to prevent excessive speed of the coiled tubing, which could lead to excessive impact on the guide rail, thus providing a protective buffer and mitigating the impact during the movement of the coiled tubing. The guide rail can accommodate different pipe diameters, and together with the second spring, it provides a buffering effect. The pulley reduces friction; by directly contacting the coiled tubing under test, the pulley can push the probe holder to move within the guide rail, thereby adapting to different pipe diameter changes. By setting a second spring, guide rail, and pulley, the detection probe (Hall probe) can maintain the same lift-off value (probe height from the object being measured) when facing continuous oil pipes of different diameters.

[0042] In this exemplary embodiment, the Hall probe can maintain a safe distance from the continuous tubing under test via pulley 19, for example, the safe distance can be 3 to 7 mm.

[0043] In this exemplary embodiment, as Figure 2 As shown, the detection device may further include clamping blocks 15 and baffles 16. The baffles 16 are arranged circumferentially along the direction of the second spring 17 to form a continuous surface. The clamping blocks 15 are disposed on opposite sides of the baffles 16.

[0044] In this exemplary embodiment, the magnetization design of the present invention optimizes the high-uniformity solenoid and the anti-interference magnetic field shielding structure to achieve uniform magnetization of the continuous tubing in the detection area, reducing the influence of environmental magnetic field interference on the detection signal. By introducing currents of different magnitudes, combining the advantages of leakage magnetic field detection and metal magnetic memory detection, an excitation magnetic field of a certain intensity (0-5mT) is applied to the continuous tubing using an unsaturated magnetization method to magnetize it to an unsaturated state. This strengthens the magnetic signal related to the stress distortion region while suppressing the influence of interference factors, thereby improving both the detection sensitivity and accuracy of early stress distortion regions and the detection rate of macroscopic defects. Here, the Hall probe detects the magnetic field, while metal magnetic memory detection, without an excitation magnetic field, can identify early stress distortion regions, and leakage magnetic field detection, by applying an external magnetic field, can identify existing defects. Both methods are achieved by using a Hall probe to detect the surrounding magnetic field anomaly region and then processing it using subsequent algorithms. The present invention combines the two methods (leakage magnetic field detection and metal magnetic memory detection).

[0045] In this exemplary embodiment, the centering follow-up velocity measurement module consists of two symmetrically arranged parts, one of which can be structured as follows: Figure 3 As shown, the centering follow-up speed measuring module may also include a movable support frame 11, a connecting shaft 10, a speed measuring wheel 13, and a first spring 9.

[0046] The first spring 9 is mounted on the speed measuring wheel platform 13, which is connected to the speed measuring roller 14 via the first spring 9. One end of the connecting shaft 10 is connected to the speed measuring roller 14, and the other end passes through the movable support frame 11 and is connected to the encoder 12. That is, the speed measuring roller 14 is connected to the encoder 12 via the connecting shaft 10. The encoder 12 is mounted on the side wall of the movable support frame 11. Here, the first spring can be used in conjunction with the speed measuring roller to adapt to changes in the diameter of different continuous tubing and to provide positioning.

[0047] Furthermore, the encoder may include a rotary encoder.

[0048] In this exemplary embodiment, during the detection process, only the two speed measuring rollers of the centering follow-up speed measuring module are in direct contact with the coiled tubing under test. Separating the detection equipment and the magnetization equipment allows both parts (magnetization equipment and detection equipment) to be more compactly positioned relative to the coiled tubing under test, resulting in better magnetization and more accurate detection results. Simultaneously, distributing the magnetization equipment on the left and right sides of the detection equipment ensures a more uniform distribution of magnetic field lines.

[0049] In this exemplary embodiment, as Figure 4 As shown, the ellipticity and wall thickness detection module may include a probe support frame 25, an electromagnetic ultrasonic thickness gauge probe 23, and a laser profile probe 24. The probe support frame 25 is fitted onto the continuous tubing and maintains a distance of 10–20 mm from it. Multiple sets of electromagnetic ultrasonic thickness gauge probes 23 and laser profile probes 24 are arranged on the inner wall of the probe support frame 25.

[0050] Furthermore, the probe support frame may include a hexagonal probe support frame, and the inner wall of the probe support frame may be provided with probe receiving slots, with two probe receiving slots on each of the six sides, for a total of 12 probe receiving slots. The electromagnetic ultrasonic thickness measurement probe and the laser profilometry probe are a group, both located on the inner wall surface of the probe support frame, and are respectively located in the probe receiving slots.

[0051] In this exemplary embodiment, as Figure 4 As shown, the ellipticity and wall thickness detection module may also include a probe baffle 22. The probe baffle 22 is arranged circumferentially along the probe support frame 25 to form a continuous surface.

[0052] In this exemplary embodiment, as Figure 1As shown, the detection device may also include a housing 1. A pipeline channel may be provided in the housing 1, through which a continuous oil pipe 5 passes. The data acquisition card 2, damage detection module 7, centering follow-up speed measurement module 4, and ellipticity and wall thickness detection module 8 are all housed in the housing 1. Here, the damage detection module, centering follow-up speed measurement module, and ellipticity and wall thickness detection module are integrated into a single housing, integrating multiple detection technologies and offering ease of use.

[0053] In this exemplary embodiment, the fan can be bolted to the inner wall of the housing. The speed measuring wheel, encoder, and movable support frame can also be bolted to the inner wall of the housing. Figure 1 As shown, the data acquisition card 2 can be fixed to the inner wall of the top of the housing 1. The ellipticity and wall thickness detection module can be accessed via... Figure 4 The fixing plate 21 shown is installed on the inner wall of the box, and the fixing plate 21 is located on one side of the probe support frame 25.

[0054] Exemplary Example 2

[0055] This exemplary embodiment provides a dual-helix type continuous tubing damage detection device.

[0056] The dual-helix coiled tubing damage detection device of this exemplary embodiment, based on exemplary embodiment 1, may further include, as in... Figure 1 The heat dissipation module 3 shown is an example of a dual-helix coiled tubing damage detection device. Specifically, this exemplary embodiment may include: a data acquisition card 2, a damage detection module 7, a centering follow-up speed measurement module 4, an ellipticity and wall thickness detection module 8, and a heat dissipation module 3. The heat dissipation module is capable of cooling the detection device.

[0057] In this exemplary embodiment, the heat dissipation module may be located above and / or below the continuous oil pipe. For example... Figure 1 As shown, the heat dissipation module is located above the continuous oil pipe. The heat dissipation module may include a fan.

[0058] Furthermore, two fans can be installed above and two below the damage detection module, for a total of four fans installed in the detection device. The fans can be bolted to the inner wall of the housing.

[0059] like Figures 1-4 As shown, the method of using / operating process of the twin-helix coiled tubing damage detection device of the present invention may include:

[0060] When the coiled tubing 5 under test passes through the detection device, it is first clamped from two points by the speed measuring roller 14 and the first spring 9, the pulley 19, the guide rail 18, and the second spring 17. Simultaneously, the speed measuring roller 14 is connected to the encoder 12 via the connecting shaft 10. The speed measuring roller 14 is driven to rotate by the coiled tubing 5, and the number of rotations is converted into an analog signal by the encoder 12 and stored in the data acquisition card 2. This signal can then be processed by the host computer to obtain displacement and velocity. The speed measuring roller 14 drives the encoder 12 to move within the guide rail of the movable support frame 11 via the connecting shaft 10, ensuring that the speed measuring roller 14 and the encoder 12 remain horizontally aligned. Then, the coiled tubing 5 under test is locally magnetized by a constant magnetic field generated by a solenoid 6 uniformly surrounding it. The Hall effect probe is located in the probe holder 20. It maintains a distance of 3-7 mm from the coiled tubing 5 under test by the backward displacement of the pulley 19 and guide rail 18. Simultaneously, the second spring 17 converts a portion of the high-speed impact of the coiled tubing 5 on the pulley 19 into elastic potential energy, achieving a buffering effect. Meanwhile, an electromagnetic ultrasonic thickness gauge 23 and a laser profile probe 24 are installed on the ellipticity and wall thickness detection module 8, maintaining a distance of 10-20 mm from the coiled tubing 5 for measurement. The acquired data can be processed using numerical processing and calibration algorithms to obtain the ellipticity and wall thickness of the coiled tubing 5, and then stored in the data acquisition card 2.

[0061] In summary, the beneficial effects include:

[0062] This invention provides a twin-helix coiled tubing damage detection device, primarily applied in the fields of petroleum equipment manufacturing and non-destructive testing. The twin-helix coiled tubing damage detection device can detect various physical defects in coiled tubing strings, such as corrosion, cracks, mechanical damage, and pitting; provide early warning of stress distortion regions; and perform real-time and accurate detection of velocity, displacement, ellipticity, and pipe wall thickness for coiled tubing of different diameters. This helps users intuitively understand the performance status of the coiled tubing, providing a scientific basis for analyzing coiled tubing failure and its eventual scrapping. Simultaneously, through accurate detection and identification of stress distortion regions, it can identify coiled tubing failure risks in the early stages of fatigue damage, providing support for predicting the remaining service life of coiled tubing and making usage decisions. This can further improve the accuracy of remaining service life prediction, ensure the safety of coiled tubing operations, and reduce usage and maintenance costs.

[0063] Although a twin-helix coiled tubing damage detection device of the present invention has been described above in conjunction with exemplary embodiments, those skilled in the art should understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A dual solenoid coiled tubing damage detection device, characterized by, The detection device comprises a data acquisition card, a damage detection module, a centering follow-up speed detection module and an ellipticity and wall thickness detection module, wherein The damage detection module, the centering follow-up speed detection module and the ellipticity and wall thickness detection module are arranged on the coiled tubing. The damage detection module comprises magnetizing devices and a detection device, the detection device is arranged between the two groups of magnetizing devices, the magnetizing devices comprise solenoids, and the coiled tubing is uniformly magnetized; the detection device detects defects and early stress distortion areas of the coiled tubing; the detection device comprises Hall probes, guide rails and pulleys, the pulleys are arranged along the circumferential direction of the coiled tubing and are in close contact with the coiled tubing, the Hall probes are arranged along the circumferential direction of the coiled tubing and are kept at a certain distance from the coiled tubing, the guide rails are arranged along the circumferential direction of the coiled tubing, the Hall probes can move in the guide rails and can keep the same lift-off value with coiled tubings of different diameters, and a surface formed by the Hall probes, the guide rails and the pulleys is perpendicular to the coiled tubing. The centering follow-up speed detection module comprises a speed detection roller and an encoder, the speed detection roller is in direct contact with the coiled tubing, and the encoder is connected with the speed detection roller and the data acquisition card. The ellipticity and wall thickness detection module can detect the ellipticity and wall thickness of the coiled tubing in real time.

2. The dual solenoid coiled tubing damage detection apparatus of claim 1, wherein, The solenoids are arranged around the coiled tubing and kept at a certain distance from the coiled tubing.

3. The dual solenoid coiled tubing inspection device of claim 1, wherein, A plurality of Hall probes are arranged in the detection device, and a plurality of Hall probes are arranged in a circle.

4. The dual solenoid coiled tubing damage detection apparatus of claim 1, wherein, The detection device further comprises a second spring and a probe fixing frame, wherein The probe fixing frame is arranged along the circumferential direction of the coiled tubing and connected with the pulley, and the Hall probes are arranged in the probe fixing frame; The guide rails are connected with the probe fixing frame; The second spring is arranged at one end of the guide rail away from the pulley.

5. The dual solenoid coiled tubing damage detection apparatus of claim 4, wherein, The detection device further comprises clamping blocks and a baffle, the baffle is arranged along the circumferential direction of the arrangement direction of the second spring to form a continuous surface, and the clamping blocks are arranged on the opposite sides of the baffle.

6. The dual solenoid coiled tubing damage detection apparatus of claim 1, wherein, The centering follow-up speed detection module further comprises a speed detection wheel table, a connecting shaft, a movable support frame and a first spring, wherein The first spring is installed on the speed detection wheel table, and the first spring is connected with the speed detection roller; One end of the connecting shaft is connected with the speed detection roller, and the other end of the connecting shaft passes through the movable support frame and is connected with the encoder; The encoder is located on the side wall of the movable support frame.

7. The dual solenoid coiled tubing inspection apparatus of claims 1 or 6, wherein, The encoder comprises a rotary encoder.

8. The dual solenoid coiled tubing inspection apparatus of claim 1, wherein, The ellipticity and wall thickness detection module comprises a probe support frame, electromagnetic ultrasonic thickness probes and laser profile probes; the probe support frame is sleeved on the coiled tubing, and a plurality of electromagnetic ultrasonic thickness probes and laser profile probes are arranged on the inner wall of the probe support frame.

9. The dual solenoid coiled tubing inspection device of claim 8, wherein, The ellipticity and wall thickness detection module further comprises a probe baffle, and the probe baffle is arranged along the circumferential direction of the probe support frame to form a continuous surface.

10. The dual solenoid coiled tubing inspection apparatus of claim 1, wherein, The detection device further comprises a heat dissipation module; the heat dissipation module is located above and below the coiled tubing.

11. The dual solenoid coiled tubing inspection device of claim 10, wherein, The heat dissipation module comprises a fan.

12. The dual solenoid coiled tubing inspection apparatus of claim 1, wherein, The detection device comprises a box body, a pipeline channel is arranged in the box body, the coiled tubing is arranged in the pipeline channel in a penetrating mode, and the data acquisition card, the damage detection module, the centering follow-up speed detection module and the ellipticity and wall thickness detection module are arranged in the box body.

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