Underground oil and gas steel pipeline circumferential weld defect detection equipment and detection method

Abstract

The invention provides buried oil gas steel pipeline circumferential weld defect detection equipment and a detection method, and belongs to the technical field of pipeline weld detection. The circumferential weld defect detection equipment for the buried oil and gas steel pipeline comprises a GPS (Global Positioning System) position indicator and a main controller, the GPS position indicator is mounted on one side of the detection equipment; the main controller is electrically connected with an output device and an input device, and the main controller is in electric signal connection with a magnetic sensor; defects can be found in time through detection, and pipeline leakage can be effectively prevented. Tiny cracks at the weld joint can be detected in advance and repaired, medium leakage caused by crack propagation is avoided, and therefore possible catastrophic accidents such as fire disasters and explosions are prevented; the corrosion defect at the weld joint can be detected, and the corrosion of the pipeline can be slowed down by detecting and repairing the circumferential weld defect in time; and the service life of the pipeline is prolonged, so that the pipeline can safely and stably run within the designed service life.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline weld detection, and in particular to a device and a method for detecting girth weld defects of a buried oil and gas steel pipeline. Background Art

[0002] At present, buried steel pipelines occupy a key position in energy transmission infrastructure. As an important part of pipeline connection, the quality of girth welds is directly related to the integrity and safety of the pipeline system. During the pipeline laying process, due to the influence of welding technology, environmental conditions, human factors and other factors, girth welds may have defects such as incomplete penetration, slag inclusions, pores, cracks, etc. During the long-term operation of the pipeline, these defects will gradually expand under the influence of internal pressure, soil stress, corrosive media, etc., causing pipeline leakage or even rupture accidents, resulting in energy waste, environmental pollution and serious safety hazards.

[0003] Welding plays an important role in the manufacturing of pressure-bearing equipment such as pipelines. The quality of welding has a direct impact on the quality and safety and reliability of pipelines. Many pipeline accidents are caused by welding defects. There is a girth weld at a certain interval of length in buried steel pipelines. Girth welds are an important part of long-distance pipelines and also a weak link. How to control the quality of girth welds and ensure that buried steel pipes will not cause safety accidents due to failure of girth welds during service is the premise for the safe operation of pipelines and one of the most concerned issues for pipeline managers. However, there is no effective detection, positioning, detection and evaluation method for girth welds in current domestic and foreign pipeline detection technologies.

[0004] Traditional girth weld inspection methods, such as X-ray inspection, have radiation hazards, low inspection efficiency, and limited sensitivity to small cracks; ultrasonic inspection requires high operator skills and is difficult to automate; conventional electromagnetic inspection methods are not accurate enough for girth weld defects of complex shapes. Therefore, it is extremely urgent to develop an efficient, high-precision, intelligent inspection technology suitable for girth weld defects in buried steel pipelines. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides a buried oil and gas steel pipeline girth weld defect detection device and detection method, aiming to improve the problems of radiation hazards and low detection efficiency when using traditional detection equipment.

[0006] The present invention is achieved in that:

[0007] In a first aspect, an embodiment of the present invention provides a buried oil and gas steel pipeline girth weld defect detection device, including a GPS locator and a main controller;

[0008] The GPS locator is installed on one side of the detection equipment; the main controller is electrically connected to an output device and an input device, and the main controller is electrically connected to a magnetic sensor.

[0009] In one embodiment of the present invention, a base is further included, the magnetic sensor is fixed on the surface of the base, a plurality of the magnetic sensors are provided, and the plurality of the magnetic sensors are arranged at equal intervals along the length direction of the base.

[0010] In one embodiment of the present invention, a shell is fixed to the base, the main controller is fixed in the shell, the output device is installed at a port on the shell, and the input device is installed on one side of the output device.

[0011] In one embodiment of the present invention, the GPS locator is fixed on one side of the base, a handheld part or a mounting frame is fixed to the base, and a buzzer and a power supply are built into the shell.

[0012] In an embodiment of the present invention, the output device is a display, and the input device includes one or more of a button, a keyboard, a touch input pad, and a mouse.

[0013] In one embodiment of the present invention, the magnetic sensor wire is connected to a filter amplifier for filtering and a signal gain device for gain supplement of the filtered digital signal, and the filter amplifier and the signal gain device are installed in the housing.

[0014] In one embodiment of the present invention, a memory is further included for storing information collected by the magnetic sensor and the GPS locator, as well as corresponding time information;

[0015] A circuit board is fixed in the shell, and the main controller, memory, filter amplifier and signal gain device are all integrated on the circuit board.

[0016] In a second aspect, an embodiment of the present invention further provides a method for detecting girth weld defects of a buried oil and gas steel pipeline, comprising the above-mentioned girth weld defect detection device for a buried oil and gas steel pipeline and the following steps:

[0017] S1: Collect the magnetic field information emitted by the pipeline, use the magnetic sensor to move along the length of the pipeline, collect the real-time magnetic field information at each position, and transmit it to the main controller;

[0018] S2: Obtaining the position information corresponding to the magnetic field information. The position information of the magnetic sensor can be collected in real time through the GPS locator;

[0019] S3: Determine the weld position of the pipeline according to the magnetic field information emitted by the pipeline, and when the detected magnetic field information meets the characteristics of the magnetic field information of the weld, determine that this position is the weld position.

[0020] In one embodiment of the present invention, it also includes an information processing step, which includes converting the magnetic field information into a digital signal, filtering the digital signal, and gain supplementing the filtered digital signal.

[0021] In one embodiment of the present invention, a large amount of magnetic field data at the pipe body and weld is collected and a database is established through data comparison; defects in the weld are characterized by comparing defect-free weld data with defective weld data.

[0022] The beneficial effects of the present invention are:

[0023] 1. Through timely detection of defects, pipeline leakage can be effectively prevented. It can detect small cracks in the weld in advance and repair them to avoid medium leakage caused by crack expansion, thereby preventing possible catastrophic accidents such as fire and explosion;

[0024] 2. It can detect corrosion defects at the welds. Timely detection and repair of girth weld defects can slow down the corrosion of pipelines and extend the service life of pipelines, so that they can operate safely and stably within the design life.

[0025] 3. Through effective girth weld defect detection, the service life of existing pipelines is extended, and the resources consumed by frequent pipeline replacement are reduced. This is of great significance for sustainable development and resource conservation;

[0026] 4. For pipelines used in industrial production, pipeline failure may lead to production interruption. Timely detection and repair of girth weld defects can avoid production stoppage losses caused by pipeline failure and ensure production continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of a buried oil and gas steel pipeline girth weld defect detection device detecting a pipeline in an embodiment of the present invention;

[0029] Figure 2 Schematic diagram of the distribution of magnetic sensors in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of a module of a buried oil and gas steel pipeline girth weld defect detection device according to an embodiment of the present invention;

[0031] Figure 4 It is a three-dimensional schematic diagram of the housing and base installation structure in an embodiment of the present invention; Figure 5 Flow chart of the pipeline weld detection method in an embodiment of the present invention.

[0032] In the figure: 010, tube body; 012, weld; 110, base; 112, magnetic sensor; 120, GPS locator; 130, main controller; 140, output device; 150, input device; 160, memory; 170, power supply; 180, filter amplifier; 190, signal gain device; 300, shell. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example

[0038] See also Figure 1-Figure 4 ,The present invention provides a technical solution: a buried oil and gas steel pipeline girth weld defect detection device;

[0039] The steel pipeline body 010 is made of metal. Due to human operation (such as welding, cathodic protection treatment, etc.) or the effect of the earth's magnetic field, the steel pipeline itself has a relatively weak magnetism, thus generating a certain magnetic field. The study found that in the pipeline body area, the signal of the magnetic field of the pipe body 010 is normal and stable. The material composition of the weld 012 is relatively complex due to its formation principle. The metal of the weld 012 cools from a high-temperature liquid state to a room-temperature solid state and undergoes two crystallization processes. Its material properties change. Therefore, the magnetic field information of the welding area will be greatly changed compared to the magnetic field information of the non-welding area. The magnetic lines of force in the welding area of ​​the pipeline ring weld 012 will have greater fluctuations than the magnetic lines of force of the pipeline body. This fluctuation of magnetic lines of force is also called leakage of magnetic lines of force. By capturing these leaked natural magnetic fields, the position of the ring weld 012 on the pipeline can be determined;

[0040] Please refer to Figure 3 The buried oil and gas steel pipeline girth weld defect detection equipment provided in this embodiment includes a GPS locator 120, a main controller 130, a magnetic sensor 112, an output device 140 and an input device 150; the magnetic sensor 112, the output device 140, the input device 150 and the GPS locator 120 are all electrically connected to the main controller 130, and also includes a power supply 170 for directly or indirectly supplying power to each device, such as directly supplying power to the main controller 130, and indirectly supplying power to the magnetic sensor 112 through the main controller 130.

[0041] Figure 1 A part of the pipeline to be inspected is shown in the figure, namely, two axially connected pipe bodies 010, and a weld 012 is between the two pipe bodies 010. In this embodiment, the buried oil and gas steel pipeline circumferential weld defect detection equipment includes a plurality of magnetic sensors 112, which can be 4-8, and the plurality of magnetic sensors 112 are evenly spaced on a bar-shaped base 110 along the length direction of the base 110. Taking the detection of pipelines buried underground as an example, when in use, the plurality of magnetic sensors 112 are located above the ground directly above the pipeline, and the arrangement direction of the plurality of magnetic sensors 112 is perpendicular to the length direction of the pipeline. When detecting along the length direction of the pipeline, it can be determined whether the weld 012 has been reached based on the magnetic field signal received by the magnetic sensor 112, and the depth of the weld 012 under the ground can be determined by the magnetic field information received by different magnetic sensors 112.

[0042] The GPS locator 120 is fixed to the base 110 and is used to obtain the real-time position information of the base 110. Therefore, it can obtain the position information corresponding to the magnetic field information while the magnetic sensor 112 collects the magnetic field information. The magnetic field information and the position information match, and the technician can determine the position of the weld 012 through the two.

[0043] Since the magnetic field information is relatively weak and may include some interference information, the buried oil and gas steel pipeline girth weld defect detection device also includes a filter amplifier 180 and a signal gain device 190, both of which are electrically connected to the main controller 130. The magnetic sensor 112 collects the magnetic field information and converts the magnetic field information into a digital signal. The digital signal containing the magnetic field information is filtered by the filter amplifier 180 to eliminate the interference information, and then supplemented by the gain of the signal gain device 190, and amplified to facilitate the main controller 130 to process and judge.

[0044] In this embodiment, the output device 140 is a display, which is electrically connected to the main controller 130 and is used to display the currently measured signal waveform, position information, function menu, power, etc. The display can be set on the base 110 or separately.

[0045] The input device 150 is electrically connected to the main controller 130 and includes one or more of a button, a keyboard, a touch input pad, and a mouse, and is used to turn on or off the detection device and operate the main controller 130 to control the operation of various devices.

[0046] In this embodiment, the buried oil and gas steel pipeline girth weld defect detection device also includes a memory 160, which can store information collected by the magnetic sensor 112 and the GPS locator 120, as well as corresponding time and other information. The information stored in the memory 160 can be called by the main controller 130, and can also be called out and viewed by technicians. The memory 160 can be a storage device integrated in the main controller 130, or it can be a pluggable mobile storage device, such as a USB flash drive and a mobile hard disk.

[0047] In this embodiment, the main controller 130 can be a single chip microcomputer, a CPU, a PLC, etc. The main controller 130 is used to control the magnetic sensor 112 to collect the magnetic field information emitted by the pipeline, and then determine the position of the weld 012 of the pipeline according to the magnetic field information emitted by the pipeline. It is also used to control the GPS locator 120 to obtain the position information of the magnetic sensor 112. It is also used to control the output device 140 to output the magnetic field information and the position information corresponding to the magnetic field information.

[0048] Furthermore, the main controller is also used to control the filter amplifier 180 and the signal gain device 190 to filter and gain-add the digital signal output by the magnetic sensor 112. The main controller 130 can be integrated on a circuit board inside the base 110, or can be separately provided.

[0049] In this embodiment, if Figure 4 As described above, when detecting a suspended pipe, the base 110 is made of a plurality of mutually hinged blocks, and a damping hinge is installed at the first joint of each block. By folding at a corresponding angle, the entire base 110 can present an arc-shaped structure to conform to the shape of the pipe to be detected, so that the magnetic sensor 112 on its surface can better perform the detection operation and provide a detection effect.

[0050] The signal gain device 190 includes an excitation unit: it is composed of a high-precision programmable signal generator and a power amplifier. The signal generator can generate excitation signals of multiple frequencies and multiple waveforms (such as sine waves, square waves, triangle waves, etc.), and its frequency range can be accurately adjusted between 30Hz-90Hz, with high waveform accuracy. The power amplifier amplifies the excitation signal generated by the signal generator to provide sufficient energy to drive the electromagnetic probe, ensuring that an alternating magnetic field of appropriate strength is generated at the buried pipeline girth weld 012, so that the metal material in the weld 012 area produces an electromagnetic induction effect.

[0051] Multiple magnetic sensors 112 form an electromagnetic probe array: a specially designed array structure is used, which includes multiple different types of electromagnetic induction probes, such as annular coil probes, Hall probes, etc. The probe array surrounds the buried steel pipeline ring weld 012 and maintains a non-contact detection distance of 10-600 cm from the pipeline surface. The annular coil probe can effectively detect the magnetic field gradient in the weld 012 area, and the Hall probe can accurately measure the magnitude of the magnetic field strength. The probe array has an automatic focusing function, which can automatically adjust the angle and sensitivity of the probe according to the shape and position of the weld 012, ensuring all-round and high-resolution detection of the ring weld 012.

[0052] The main controller 130 includes a signal acquisition and conditioning unit: connected to the electromagnetic probe array, responsible for collecting electromagnetic induction signals detected by the probe. The unit has a high sampling rate, which can reach more than 300 times per second, and has high gain amplification capability for weak signals. The amplification factor can be adjusted between 10-50 times. At the same time, it has a low noise filtering function, which effectively filters out environmental electromagnetic interference and noise signals, ensuring that the collected signals truly reflect the electromagnetic characteristics of the girth weld 012. After conditioning, the collected signals are converted into digital signals and transmitted to the data processing and analysis unit.

[0053] It also includes a data processing and analysis unit: built on a high-performance digital signal processor (DSP) and an advanced artificial intelligence algorithm chip. The DSP performs digital signal processing operations such as fast Fourier transform (FFT) and wavelet analysis on the collected digital signals to extract the characteristic parameters of the signals, such as frequency components, amplitude changes, phase differences, etc. The artificial intelligence algorithm chip has a built-in deep learning neural network model. After training with a large number of girth weld 012 defect sample data, it can automatically identify whether there are defects in the girth weld 012 based on the extracted characteristic parameters, and accurately judge the defect type (such as incomplete penetration, slag inclusions, pores, cracks, etc.), size, and location. The unit also has self-learning and adaptive capabilities, and can continuously optimize the model algorithm to improve detection accuracy and reliability.

[0054] The display and memory 160 form a display and storage unit: used to intuitively display the test results and store the test data. The test results are presented in the form of three-dimensional images and detailed data reports. The three-dimensional image can clearly show the shape of the girth weld 012 and the position, size and type of the defect in the weld 012. The data report records detailed information such as the test time, pipeline location, girth weld 012 number, defect parameters, etc. The storage unit uses a large-capacity solid-state hard drive, which can store massive test data for subsequent query, analysis and tracing.

[0055] During the construction period of the pipeline, after the welding and installation are completed in sections, the girth weld 012 needs to be subjected to non-destructive testing including X-ray and ultrasonic testing. If the non-destructive testing report shows that a certain weld 012 has a welding defect that must be repaired, at this time, the trench backfill of this section of the pipeline may have been completed, and there is no way to find this defective girth weld 012 above the ground. The pipeline owner and the construction unit can only excavate the entire section of the buried pipeline, which consumes huge manpower and material costs, and is likely to cause inevitable damage to the outer anti-corrosion layer of the newly built pipeline. For buried pipelines, especially long-distance pipelines, the surface characteristics will keep changing. Although pipeline managers set up test piles, mileage signs, and various markers on the surface as much as possible during pipeline construction in order to better implement pipeline integrity management, line patrol managers can rely on these signs to understand the approximate laying position and direction of the pipeline, but these signs are set at a certain distance along the pipeline. Test piles are generally set at 0 meters, and markers are set at 400 to 800 meters. Most markers and signs will be damaged due to time and environmental factors. Even if the signs above the ground along the pipeline are clear and accurate, it is difficult to find the position of the girth weld 012 on the pipeline about 12 meters apart above the ground with these signs. That is, after the buried pipeline is completed, backfilled and put into use, the manager cannot know the specific position of the pipeline girth weld 012, that is, the risk of the weak link of the pipeline.

[0056] 1. Limitations of the detection method

[0057] Ultrasonic testing is one of the commonly used methods, but the detection accuracy of micro cracks and delamination defects is limited. In particular, when the crack is perpendicular to the ultrasonic propagation direction, it may be missed. For example, micro cracks perpendicular to the weld surface in some heat-affected zones may not be effectively detected by ultrasonic testing.

[0058] Although radiographic testing can visually display the shape and size of internal defects in weld 012, it poses radiation hazards to the human body and the testing process is relatively complicated. For the girth weld 012 of buried pipelines, excavation is required for radiographic testing, which increases the testing cost and time. Moreover, radiographic testing is sensitive to the directionality of defects. When the defect plane is parallel to the direction of the ray, the defect may not be clearly displayed.

[0059] Magnetic particle testing and penetration testing are mainly suitable for detecting surface opening defects. For buried pipeline girth weld 012, since there may be dirt and anti-corrosion layer on the pipeline surface, the pretreatment process of these methods is cumbersome and the detection ability of near-surface non-opening defects is insufficient.

[0060] 2. Difficulty in quantifying and quantifying defects

[0061] Many testing methods have difficulty accurately determining the nature of defects after they are detected. For example, ultrasonic testing can detect echo anomalies, but it is difficult to distinguish whether the anomaly is caused by pores, slag inclusions, or cracks. There are also certain errors in the quantification of the size and depth of defects. Different inspectors may have different interpretations of the test results, which will also affect the accurate judgment of defects.

[0062] 3. Equipment adaptability

[0063] Existing inspection equipment may not be able to adapt to all pipeline specifications and environments. For example, for the 012 inspection of girth welds on some small-diameter pipelines, due to limited space, conventional-sized inspection probes cannot be placed in the appropriate position. For large-diameter, thick-walled pipelines, inspection equipment requires higher power and sensitivity to effectively inspect, but some current equipment may not meet the requirements.

[0064] 1. Security

[0065] 1. Prevent leakage accidents: buried steel pipelines are usually used to transport hazardous media such as oil, natural gas, and chemical raw materials. The girth weld 012 is a weak link in the pipeline structure. By detecting and discovering defects in time, pipeline leakage can be effectively prevented. For example, if the tiny cracks at the weld 012 can be detected in advance and repaired, the leakage of the medium caused by the expansion of the cracks can be avoided, thereby preventing possible catastrophic accidents such as fire and explosion. Once such an accident occurs, it will not only cause serious damage to the surrounding environment, but also threaten people's lives and property safety.

[0066] For urban gas pipelines, the detection of 012 defects in girth welds is even more important. Cities are densely populated, and gas leaks may cause large-scale explosions and poisoning incidents. Regular testing can ensure that gas is safely delivered to thousands of households, protecting the lives and normal living order of residents.

[0067] 2. Extend the service life of pipelines: Timely detection and repair of girth weld 012 defects can slow down the corrosion and damage of pipelines. For example, when corrosion defects at weld 012 are detected, appropriate anti-corrosion and repair measures, such as repair welding and replacement of corroded parts, can prevent corrosion from further spreading to the pipeline matrix. This helps maintain the overall integrity of the pipeline, allowing it to operate safely and stably within its design life, and reducing replacement costs and resource waste caused by premature failure of the pipeline.

[0068] 2. Economic Benefits

[0069] 1. Reduce maintenance costs: Early detection of girth weld 012 defects can be handled when the defects are still small and easier to repair. If the defects are not discovered in time, they may continue to expand over time and cause pipeline failure. For example, if a small pore defect is not handled in time, it may develop into a penetrating crack under the influence of the internal pressure of the pipeline and the external environment. At that time, the cost of maintenance will increase significantly, which may involve large-scale pipeline replacement or complex repair projects, such as replacing the entire section of the pipeline, performing large-scale welding repair operations, etc. Early detection and repair only require simple repair welding or local treatment, and the cost is relatively low.

[0070] For pipelines used in industrial production, pipeline failure may lead to production interruption. Timely detection and repair of girth weld 012 defects can avoid production stoppage losses caused by pipeline failure, ensure the continuity of production, and save a lot of economic losses for enterprises in the long run.

[0071] 2. Optimize resource utilization: Buried steel pipelines are important infrastructure, and their construction requires a large amount of steel and other resources. Through effective girth weld 012 defect detection, the service life of existing pipelines can be extended, and the resources consumed by frequent pipeline replacement can be reduced. This is of great significance for sustainable development and resource conservation. For example, a large number of pipelines are put into use in the oil and gas industry every year. Reasonable use of existing pipelines and reduction of new pipeline production can reduce energy consumption and carbon emissions, which is in line with both environmental protection and economic benefits.

[0072] See also Figure 5 The embodiment of the present invention further provides a method for detecting girth weld defects of a buried oil and gas steel pipeline, comprising the above-mentioned girth weld defect detection device for a buried oil and gas steel pipeline and the following steps:

[0073] Step S1, collecting magnetic field information emitted by the pipeline.

[0074] Taking the buried oil and gas steel pipeline girth weld defect detection device of the embodiment of the present invention as an example, step S1 can be implemented by the magnetic sensor 112. This step can include detecting the magnetic field information emitted by each position of the pipeline within a preset length. Specifically, the magnetic sensor 112 is moved along the length direction of the pipeline to collect real-time magnetic field information at each position and transmit it to the main controller 130.

[0075] Step S2, obtaining position information corresponding to the magnetic field information.

[0076] This step is performed simultaneously with step S1. Taking the buried oil and gas steel pipeline ring weld defect detection equipment of the embodiment of the present invention as an example, step S2 can be implemented by the GPS locator 120. The GPS locator 120 can collect the position information of the magnetic sensor 112 in real time. Therefore, the position information corresponds to the magnetic field information collected by the magnetic sensor 112 in real time.

[0077] Step S3, determining the position of the weld 012 of the pipeline according to the magnetic field information emitted by the pipeline.

[0078] Step S3 can be implemented by the main controller 130, and the main controller 130 determines whether a certain magnetic field information corresponds to the position of the weld 012. In other embodiments of the present invention, the staff holds the magnetic sensor 112 of the buried oil and gas steel pipeline girth weld defect detection device for detection, and grasps the position of the magnetic sensor 112 in real time, so the GPS locator 120 may not be set to obtain the position information. When the detected magnetic field information meets the characteristics of the magnetic field information of the weld 012, the position is determined to be the position of the weld 012.

[0079] Furthermore, the magnetic field information is collected by the magnetic sensor 112, and after the step of collecting the magnetic field information emitted by the pipeline on the ground, an information processing step is also included, and the information processing step includes converting the magnetic field information into a digital signal, filtering the digital signal, and supplementing the gain of the filtered digital signal. Taking the buried oil and gas steel pipeline girth weld defect detection device of the embodiment of the present invention as an example, the magnetic sensor 112 can convert the collected magnetic field information into a digital signal, and the filter amplifier 180 and the signal gain device 190 can perform filtering and gain supplementation respectively.

[0080] Furthermore, the pipeline weld detection method may also include outputting magnetic field information and position information corresponding to the magnetic field information. In this embodiment, this step is implemented by a display as an output device 140, which is electrically connected to the main controller 130 and is used to display the currently measured signal waveform, position information, function menu, power, etc.

[0081] Furthermore, the pipeline weld detection method further includes storing magnetic field information and position information corresponding to the magnetic field information. In this embodiment, the memory 160 is used to store the magnetic field information and position information, time information, etc. corresponding to the magnetic field information. Therefore, the staff does not need to make real-time analysis, and can call data from the memory 160 for analysis later.

[0082] Specific detection method:

[0083] 1. Preparation before testing: Use the underground pipeline locator to accurately determine the location of the buried steel pipeline and the distribution of the girth weld 012, and mark it on the ground. Connect and debug the excitation unit, electromagnetic probe array, signal acquisition and conditioning unit, data processing and analysis unit, and display and storage unit of the detection system as required to ensure the normal operation of each component. According to the parameters such as pipeline material, wall thickness, girth weld 012 size, etc., set the corresponding excitation signal parameters in the detection system, such as frequency, waveform, power, etc.

[0084] 2. Electromagnetic excitation and signal acquisition: Start the excitation unit, generate excitation signals according to the set parameters, and generate an alternating magnetic field above the girth weld 012 through the electromagnetic probe array. The electromagnetic probe array synchronously collects the electromagnetic induction signal generated by the girth weld 012 under the action of the magnetic field. The signal acquisition and conditioning unit amplifies, filters, digitizes, and processes the collected signal, and then transmits it to the data processing and analysis unit. During the acquisition process, the detection system moves at a uniform speed along the pipeline girth weld 012 to ensure that the entire girth weld 012 is fully detected.

[0085] 3. Data processing and analysis: After receiving the collected signal, the data processing and analysis unit first uses DSP to perform digital signal processing and extract the characteristic parameters of the signal. The characteristic parameters are then input into the deep learning neural network model in the artificial intelligence algorithm chip for analysis and judgment. The model determines whether there is a defect in the girth weld 012 based on the input characteristic parameters and the pre-trained model data. If there is a defect, the type, size and location of the defect are further determined, and the results are transmitted to the display and storage unit.

[0086] 4. Result display and storage: After receiving the test results, the display and storage unit displays them in the form of 3D images and data reports. The 3D image intuitively presents the appearance of the girth weld 012 and detailed information of the defects on the display screen, and the data report records all test-related data. At the same time, the test data is stored in a large-capacity solid-state hard drive for subsequent query and analysis.

[0087] The pipeline weld detection method of the embodiment of the present invention can locate the buried pipeline weld 012 above the ground, help relevant staff to grasp the specific location of the pipeline weld 012, and ensure that there are no safety hazards above the ground in these weak parts. After obtaining the weld 012 position data and combining it with other detection data, a more scientific pipeline repair plan can be formulated to ensure the safe operation of the pipeline. The pipeline weld 012 can be located and detected without peeling off the anti-corrosion insulation layer. Before the pipeline excavation verification or repair, the buried oil and gas steel pipeline girth weld defect detection equipment of the embodiment of the present invention can quickly locate the specific weld 012 position in the excavation area, saving the excavation cost of the non-weld 012 position. In some special pipe sections where external detection (ECDA) and intelligent internal detection (ILI) and conventional non-destructive testing methods cannot be implemented, the present invention is not limited and can quickly and effectively locate and detect the weld 012.

[0088] By using the detection method of this embodiment to locate weld 012 above the ground and grasp the position of weld 012, after completing the detection of the external anti-corrosion layer, a more reasonable excavation verification and repair plan can be determined based on the detection results of the external anti-corrosion layer and the specific position of weld 012. That is, if the damaged part of the anti-corrosion layer is located at or near the patch position, this place can be preferentially selected for excavation verification. First, verify whether there are defects in weld 012 under the patch band, and eliminate possible risks of weld 012. This is more practical than simply inspecting the external anti-corrosion layer and repairing the external anti-corrosion layer only according to the severity of damage to the external anti-corrosion layer.

[0089] In addition, the buried oil and gas steel pipeline girth weld defect detection equipment collects a large amount of magnetic field data at the pipe body and weld 012, and establishes a database through data comparison. By comparing the defect-free weld 012 data with the defective weld 012 data, the possible defects in the weld 012 are characterized.

[0090] In summary, the pipeline weld detection method provided by the embodiment of the present invention is used to detect the position of the weld 012 of the steel pipeline, which includes collecting the magnetic field information emitted by the pipeline, and judging the position of the weld 012 of the pipeline according to the magnetic field information emitted by the pipeline. Because the steel pipeline has a relatively weak magnetism under human operation (such as welding, cathodic protection treatment, etc.) or the action of the earth's magnetic field, the magnetic field information of the welding position and the non-welding position of the pipeline will be significantly different. The magnetic lines of force in the welding area of ​​the pipeline ring weld 012 will have a larger fluctuation than the magnetic lines of force of the pipeline body. This fluctuation of the magnetic lines of force is also called the leakage of the magnetic lines of force. The position of the weld 012 on the pipeline can be determined by obtaining the magnetic field information of the pipeline. This pipeline weld detection method can effectively and conveniently locate the ring weld 012 of the buried or coated steel pipeline, and can even use the magnetic field information to judge whether there are serious defects at the weld 012.

[0091] The working principle of the buried oil and gas steel pipeline girth weld defect detection equipment: Taking the pipeline buried underground as an example, when the buried oil and gas steel pipeline girth weld defect detection equipment of this embodiment is used, the staff can hold the base 110 provided with a magnetic sensor 112, and make it located directly above the pipeline to be detected, so that the magnetic sensor 112 faces downward, and its arrangement direction is perpendicular to the length direction of the pipeline. Move along the length direction of the pipeline, detect the magnetic field information of each position of the pipeline, and use the GPS locator 120 to obtain the position information. Both types of information are output on the output device 140 (i.e., the display) at the same time, and the staff can judge whether the weld 012 position has been reached through the magnetic field information. At the same time, the magnetic field information of the pipeline and the position information and time information corresponding to the magnetic field information can all be stored in the memory 160 for retrieval. Similarly, when some overhead pipes are wrapped with a coating layer on the outside and it is difficult to determine the position of the weld 012, this detection device can also be used for detection by a similar method;

[0092] The buried oil and gas steel pipeline girth weld defect detection device of the embodiment of the present invention comprises a magnetic sensor 112 and a main controller 130 electrically connected to the magnetic sensor 112, wherein the magnetic sensor 112 is used to collect magnetic field information emitted by the pipeline; the main controller 130 is used to receive the magnetic field information transmitted by the magnetic sensor 112, and determine the position of the pipeline weld 012 according to the magnetic field information emitted by the pipeline. The buried oil and gas steel pipeline girth weld defect detection device is used to implement the above-mentioned detection method, and therefore also has the same beneficial effect.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A buried oil and gas steel pipeline girth weld defect detection device, characterized in that: include A GPS locator (120), wherein the GPS locator (120) is installed on one side of the detection device; A main controller (130), wherein the main controller (130) is electrically connected to an output device (140) and an input device (150), and the main controller (130) is electrically connected to a magnetic sensor (112).

2. The buried oil and gas steel pipeline girth weld defect detection device according to claim 1 is characterized in that: It also includes a base (110), the magnetic sensor (112) is fixed on the surface of the base (110), a plurality of the magnetic sensors (112) are provided, and the plurality of magnetic sensors (112) are arranged at equal intervals along the length direction of the base (110).

3. The buried oil and gas steel pipeline girth weld defect detection device according to claim 2 is characterized in that: The base (110) is fixed with a shell (300), the main controller (130) is fixed in the shell (300), the output device (140) is installed at a port on the shell (300), and the input device (150) is installed on one side of the output device (140).

4. The buried oil and gas steel pipeline girth weld defect detection device according to claim 3 is characterized in that: The GPS locator (120) is fixed on one side of the base (110), a handheld part or a mounting frame is fixed to the base (110), and a buzzer and a power supply (170) are built into the housing (300).

5. The buried oil and gas steel pipeline girth weld defect detection device according to claim 1 is characterized in that: The output device (140) is a display, and the input device (150) includes one or more of a button, a keyboard, a touch input board, and a mouse.

6. The buried oil and gas steel pipeline girth weld defect detection device according to claim 4 is characterized in that: The magnetic sensor (112) is connected to a filter amplifier (180) for filtering and a signal gain device (190) for supplementing the gain of a digital signal after filtering. The filter amplifier (180) and the signal gain device (190) are installed in the housing (300).

7. The buried oil and gas steel pipeline girth weld defect detection device according to claim 4 is characterized in that: It also includes a memory (160) for storing information collected by the magnetic sensor (112) and the GPS locator (120), as well as corresponding time information; A circuit board is fixed in the housing (300), and the main controller (130), the memory (160), the filter amplifier (180) and the signal gain device (190) are all integrated on the circuit board.

8. A method for detecting defects in girth welds of buried oil and gas steel pipelines, characterized in that: include The buried oil and gas steel pipeline girth weld defect detection device according to any one of claims 1 to 7; and the following steps: S1: collecting magnetic field information emitted by the pipeline, using a magnetic sensor (112) to move along the length direction of the pipeline, collecting real-time magnetic field information at each position, and transmitting it to a main controller (130); S2: Acquiring position information corresponding to the magnetic field information, and collecting the position information of the magnetic sensor (112) in real time through a GPS locator (120); S3: Determine the position of the weld (012) of the pipeline according to the magnetic field information emitted by the pipeline, and when the detected magnetic field information meets the characteristics of the magnetic field information of the weld (012), determine that this position is the position of the weld (012).

9. A method for detecting girth weld defects of buried oil and gas steel pipelines according to claim 8, characterized in that: The method also includes an information processing step, which includes converting the magnetic field information into a digital signal, filtering the digital signal, and performing gain supplementation on the filtered digital signal.

10. The method for detecting girth weld defects of buried oil and gas steel pipelines according to claim 8, characterized in that: A large amount of magnetic field data of the pipe body (010) and the weld (012) is collected and a database is established through data comparison; defects existing in the weld (012) are characterized by comparing data of a non-defective weld (012) with data of a defective weld (012).

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