A subsea pipeline corrosion resistance detection device

Abstract

The utility model discloses a kind of submarine pipeline corrosion resistance detection devices, including central framework, front cavity and rear cavity are equipped in the central framework, end plate is fixedly sleeved on the central framework and located the two ends of front cavity, permanent magnet is fixedly installed in the front cavity, a plurality of hall sensors that are annular array layout around permanent magnet are embedded in the end plate, data logger electrically connected with hall sensor is installed in the rear cavity, the outer side of the central framework is annular array layout with submarine pipeline pipe wall and is in contact with the roller.This utility model, when device advances, the signal of hall sensor and odometer wheel is transmitted to data logger by cable, data logger stores data packet in internal storage medium, device reaches pipeline end and makes staff take out data logger, download data, utilize professional software to analyze magnetic flux leakage signal atlas, combine mileage information, accurately position and quantify the corrosion defect of pipeline.

Description

Technical Field

[0001] This utility model relates to the field of pipeline corrosion resistance testing technology, and in particular to a corrosion resistance testing device for subsea pipelines. Background Technology

[0002] Subsea pipelines are critical infrastructure in modern offshore oil and gas development and transportation systems, widely used in offshore oil and gas field production systems. They play a vital role in transporting crude oil, natural gas, or oil and gas mixtures from subsea wellheads or platforms to onshore processing facilities or floating production storage and offloading (FPSO) vessels. Pipelines are typically laid on the seabed surface or buried in seabed sediments, operating in a high-salinity, high-pressure, and low-temperature deep-sea environment. They also face multiple external mechanical damage risks, including highly corrosive seawater, ocean currents, fishing trawls, and ship anchoring, making their operating conditions extremely harsh.

[0003] As subsea pipelines age, their walls become susceptible to corrosion and wear under the combined effects of various factors, including water dew point corrosion, gravel erosion, crude oil runoff, and microbial corrosion (such as sulfate-reducing bacteria), leading to gradual wall thinning. Wall thinning not only weakens the overall structural strength of the pipeline but can also cause localized stress concentration and degradation of material mechanical properties, significantly reducing the pipeline's pressure-bearing capacity and fatigue life. Ultimately, this can result in oil and gas leaks, causing significant environmental pollution and economic losses. Utility Model Content

[0004] The purpose of this utility model is to provide a corrosion resistance testing device for submarine pipelines in order to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A corrosion resistance detection device for subsea pipelines includes a central frame with a front cavity and a rear cavity. End plates located at both ends of the front cavity are fixedly sleeved on the central frame. A permanent magnet is fixedly installed in the front cavity. Several Hall sensors arranged in a ring array around the permanent magnet are embedded in the end plates. A data logger electrically connected to the Hall sensors is installed in the rear cavity. Rollers that abut against the wall of the subsea pipeline are arranged in a ring array around the central axis of the central frame.

[0006] As a further description of the above technical solution: A fixed seat is fixedly connected to one end of the central frame away from the rear cavity. A first connecting rod is rotatably connected to the fixed seat. A roller is rotatably installed at the free end of the first connecting rod. A second connecting rod is rotatably connected to the middle of the first connecting rod. The free end of the second connecting rod moves along the central axis of the central frame.

[0007] As a further description of the above technical solution: A square rod is fixedly connected between the fixed seat and the end plate near the rear cavity. A slide block is slidably sleeved on the square rod. The free end of the second connecting rod is rotatably connected to the slide block. A compression spring is movably sleeved on the square rod. The two ends of the compression spring are fixedly connected to the slide block and the end plate, respectively.

[0008] As a further description of the above technical solution: A cover located at the rear end of the rear cavity is fixedly fitted onto the central frame, and a turbine is rotatably mounted in the middle of the cover.

[0009] As a further description of the above technical solution: An odometer wheel, electrically connected to a data logger, is installed inside the rear cavity.

[0010] As a further description of the above technical solution: The rear cavity houses a battery that is electrically connected to the Hall sensor, odometer wheel, and data logger.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. In this utility model, as the device moves forward, the permanent magnet continuously magnetizes the pipe wall ahead. When the magnetized area encounters corrosion pits, cracks, or thinning of the wall, magnetic leakage is generated. The Hall sensor in the ring array detects these magnetic leakage signals in real time and converts them into analog voltage signals. The odometer wheel rolls as the device moves forward, and its built-in encoder generates pulse signals to record the travel distance in real time. The signals from the Hall sensor and the odometer wheel are transmitted to the data logger via cable. Powered by the battery, the data logger synchronously acquires and digitizes the signals, and stores the "position-magnetic field strength" data packet in the internal storage medium. When the device reaches the "ball collection tube" at the end of the pipe, it is retrieved. The staff takes out the data logger, downloads the data, and uses professional software to analyze the magnetic leakage signal spectrum. Combined with the mileage information, the corrosion defects of the pipe are accurately located and quantified.

[0012] 2. In this utility model, the first link, the second link, the slide, the compression spring, and the square rod together constitute a mechanical structure of "four-link + sliding guide rail + spring preload". When the device encounters pipe deformation, weld seam, or unevenness, the roller will be impacted. This impact is transmitted to the second link through the first link, which in turn pushes the slide to slide on the square rod. The compression spring is compressed to absorb the impact energy. When the external force disappears, the compression spring resets and pushes the slide back to its original position, realizing dynamic buffering and adaptive adjustment, ensuring that the roller always has good contact with the pipe wall, and avoiding damage to the sensor or signal distortion due to severe vibration. Attached Figure Description

[0013] Figure 1This diagram shows a three-dimensional structural schematic of a corrosion resistance testing device for subsea pipelines according to an embodiment of the present invention. Figure 2 This is a top view schematic diagram of a corrosion resistance testing device for subsea pipelines according to an embodiment of the present invention; Figure 3 It shows Figure 2 Schematic sectional view along the middle AA direction; Figure 4 A three-dimensional structural schematic diagram of a turbine provided according to an embodiment of the present invention is shown.

[0014] Legend: 1. Central frame; 101. Front cavity; 102. Rear cavity; 2. First connecting rod; 3. Square rod; 4. Second connecting rod; 5. Roller; 6. Slide; 7. Compression spring; 8. Fixed seat; 9. End plate; 10. Cover; 11. Hall sensor; 12. Permanent magnet; 13. Odometer wheel; 14. Data logger; 15. Battery; 16. Turbine. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-4 This utility model provides a technical solution: a corrosion resistance detection device for subsea pipelines, comprising a central frame 1, a front cavity 101 and a rear cavity 102 within the central frame 1. A permanent magnet 12 is fixedly installed in the front cavity 101 as a magnetization source, generating a strong magnetic field to magnetize the pipeline wall. End plates 9 are fixedly fitted onto the central frame 1 at both ends of the front cavity 101. Several Hall sensors 11 are embedded in the end plates 9 in a ring array around the permanent magnet 12. These are magnetic field sensing units used to detect leakage magnetic signals caused by pipeline corrosion or defects. An odometer wheel is installed in the rear cavity 102. Hall sensor 11 and odometer wheel 13 are electrically connected to data logger 14. Odometer wheel 13 is used to measure the travel distance of the device and provide accurate location information for detected defects. Data logger 14 is the data processing and storage center, responsible for receiving, processing and storing signals from Hall sensor 11 and odometer wheel 13. Hall sensor 11, odometer wheel 13 and data logger 14 are electrically connected to battery 15. Battery 15 provides power to all electronic devices such as Hall sensor 11, odometer wheel 13 and data logger 14.

[0017] Specifically, such as Figure 1 and Figure 3 As shown, three sets of fixed seats 8 are fixedly connected to one end of the central frame 1 away from the rear cavity 102, arranged in an array around its central axis. A first connecting rod 2 is rotatably connected to the fixed seat 8. A roller 5 is rotatably mounted on the free end of the first connecting rod 2 to support the pipe wall of the submarine pipeline, thereby keeping it in the center of the pipeline, reducing travel friction, ensuring that the Hall sensor 11 maintains a constant distance from the pipe wall, and improving detection accuracy. A second connecting rod 4 is rotatably connected to the middle of the first connecting rod 2. A square rod 3 is fixedly connected between the fixed seat 8 and the end plate 9 near the rear cavity 102. A sliding seat 6 is slidably mounted on the square rod 3. The free end of the second connecting rod 4 is rotatably connected to the sliding seat 6. A compression spring 7 is movably mounted on the square rod 3. The two ends of the compression spring 7 are fixedly connected to the sliding seat 6 and the end plate 9, respectively. The first link 2, the second link 4, the slide 6, the compression spring 7, and the square rod 3 together form a mechanical structure of "four-bar linkage + sliding guide rail + spring preload". When the device encounters pipe deformation, weld seam or unevenness, the roller 5 will be impacted. This impact is transmitted to the second link 4 through the first link 2, which in turn pushes the slide 6 to slide on the square rod 3. The compression spring 7 is compressed to absorb the impact energy. When the external force disappears, the compression spring 7 returns to its original position and pushes the slide 6 back to its original position. This achieves dynamic buffering and adaptive adjustment, ensuring that the roller 5 always has good contact with the pipe wall and avoiding damage to the sensor or signal distortion due to severe vibration.

[0018] Specifically, such as Figure 4 As shown, a cover 10 located at the end of the rear cavity 102 is fixedly fitted onto the central frame 1. A turbine 16 is rotatably mounted in the middle of the cover 10, with its blades exposed in the flow path of the fluid (oil or gas) in the pipeline. The fluid in the pipeline impacts the turbine 16, causing it to rotate. The rotation of the turbine 16 can directly drive the device forward. In addition, the rotating shaft of the turbine 16 can also be connected to a small generator to charge the battery 15, realizing partial energy recovery and extending the detection operation time.

[0019] Working principle: When in use, the detection device is placed into the seabed pipeline from the "launching tube" of the pipeline. The fluid transported in the pipeline begins to propel the device forward. The fluid impacts the turbine 16, causing it to rotate at high speed. The thrust generated by the turbine 16 is converted into forward power, driving the entire device to move in the pipeline. As the device moves forward, the permanent magnet 12 continuously magnetizes the pipe wall in front. When the magnetized area encounters corrosion pits, cracks, or thinning of the wall, leakage magnetic field is generated. The Hall sensor 11 of the ring array detects these leakage magnetic field signals in real time and converts them into analog voltage signals. The odometer wheel 13 rolls as the device moves forward, and its built-in encoder generates pulse signals to record the distance traveled in real time. The signals from the Hall sensor 11 and the odometer wheel 13 are transmitted to the data logger 14 through a cable. Powered by the battery 15, the data logger 14 synchronously acquires and digitizes the signals and stores the "position-magnetic field strength" data packet in the internal storage medium. During the journey, when a roller 5 encounters a protrusion or weld on the inner wall of the pipe, the impact force is transmitted through the first link 2 and the second link 4, causing the slide 6 to slide on the square rod 3. The compression spring 7 absorbs the energy, and the elasticity of the compression spring 7 ensures that the roller 5 can quickly return to its original position after passing the obstacle, maintaining stable contact with the pipe wall. The whole process is smooth and without violent vibration. Once the device reaches the end of the pipeline, the "ball collector" is retrieved. The staff takes out the data logger 14, downloads the data, and uses professional software to analyze the magnetic flux leakage signal spectrum. Combined with mileage information, they accurately locate and quantify the corrosion defects in the pipeline.

[0020] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A corrosion resistance testing device for subsea pipelines, comprising a central frame (1), characterized in that, The central frame (1) is provided with a front cavity (101) and a rear cavity (102). The central frame (1) is fixedly fitted with end plates (9) located at both ends of the front cavity (101). A permanent magnet (12) is fixedly installed in the front cavity (101). Several Hall sensors (11) arranged in a ring array around the permanent magnet (12) are embedded in the end plates (9). A data logger (14) electrically connected to the Hall sensors (11) is installed in the rear cavity (102). Rollers (5) that abut against the wall of the subsea pipeline are arranged in a ring array around the central axis of the central frame (1).

2. The corrosion resistance testing device for subsea pipelines according to claim 1, characterized in that, A fixed seat (8) is fixedly connected to one end of the central frame (1) away from the rear cavity (102). A first connecting rod (2) is rotatably connected to the fixed seat (8). A roller (5) is rotatably installed at the free end of the first connecting rod (2). A second connecting rod (4) is rotatably connected to the middle of the first connecting rod (2). The free end of the second connecting rod (4) moves along the central axis of the central frame (1).

3. The corrosion resistance testing device for subsea pipelines according to claim 2, characterized in that, A square rod (3) is fixedly connected between the fixed seat (8) and the end plate (9) near the rear cavity (102). A slide seat (6) is slidably sleeved on the square rod (3). The free end of the second connecting rod (4) is rotatably connected to the slide seat (6). A compression spring (7) is movably sleeved on the square rod (3). The two ends of the compression spring (7) are fixedly connected to the slide seat (6) and the end plate (9) respectively.

4. The corrosion resistance testing device for subsea pipelines according to claim 3, characterized in that, The central frame (1) is fixedly fitted with a cover (10) located at the end of the rear cavity (102), and a turbine (16) is rotatably installed in the middle of the cover (10).

5. The corrosion resistance testing device for subsea pipelines according to claim 1, characterized in that, The rear cavity (102) is equipped with an odometer wheel (13) that is electrically connected to the data logger (14).

6. The corrosion resistance testing device for subsea pipelines according to claim 5, characterized in that, The rear cavity (102) contains a battery (15) that is electrically connected to the Hall sensor (11), the odometer wheel (13) and the data logger (14).

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