Composite detection device and method for defects of inner and outer walls of pipeline and deformation of pipeline

Abstract

The invention belongs to the technical field of petroleum and natural gas well control, and provides a composite detection device and method for defects of inner and outer walls of a pipeline and deformation of the pipeline. The device comprises a detection probe which is internally provided with a detection circuit and is used for judging the defects of the inner wall and the outer wall of the pipeline from the inner side of the pipeline; and an angle sensor is arranged in the rotating shaft and is used for detecting the angle change of the probe arm caused by the deformation of the pipe wall. According to the device, the detection probe and the angle sensor are integrated, the detection probe internally comprises a detection coil, a U-shaped magnet, a small signal amplification circuit and the like, and the circuit can detect the defects of the inner wall of the pipeline and is not sensitive to the defects of the outer wall of the pipeline by selecting the magnet with the proper magnetic field intensity and the corresponding number of turns of the induction coil; therefore, discrimination of the defective inner and outer walls of the pipeline is realized. Meanwhile, angle change of the probe arm caused by pipe wall deformation is detected through an angle sensor and serves as a deformation signal to be output.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas well control, and particularly relates to a composite detection device and method for defects on the inner and outer walls of a pipeline and pipeline deformation. Background Art

[0002] Pipeline transportation is the best way for long-distance transportation of fluid media such as natural gas and oil. Most of the oil and gas pipelines are buried steel pipelines, and have anti-corrosion coatings and / or cathodic protection means to reduce corrosion caused by the soil. However, during the long-term operation of the pipeline, defects caused by various reasons will still be encountered: ① Defects on the outer wall of the pipe wall when the anti-corrosion coating is damaged or the cathode is under-protected; ② Defects on the inner wall of the pipe wall caused by corrosion of the transported medium; ③ Pipeline deformation such as dents, oval deformation, bending, and sinking caused by reasons such as formation movement or third-party construction damage. These defects and deformations will increase the resistance of the transported medium, resulting in a decrease in transmission efficiency. At the same time, they will also reduce the strength of the pipeline, forming a safety hazard. In serious cases, it may lead to pipeline rupture, resulting in production suspension, economic losses, environmental pollution, and even personal casualties. Therefore, pipeline defect detection is a basic requirement for maintaining the normal operation of in-service pipelines.

[0003] Currently, the mainstream method for pipeline defect detection is to use an in-pipeline detector. By means of a magnetic flux leakage detection probe, inner and outer wall defect discrimination probes (ID / OD), and deformation detection probes carried by itself, the change signals generated by pipeline defects or deformations are obtained. After being digitized inside the detector, they are stored in the recorder cabin, and the data is downloaded and analyzed after the detection process is completed.

[0004] Traditional inner and outer wall defect discrimination probes are based on the principle of eddy current detection. An active excitation signal needs to be provided for each probe, and the received signals need to be processed complexly. Both the power consumption and complexity are relatively high. In addition, the inner and outer wall defect discrimination probes are relatively large in size. Each probe can only output 1 analog signal into the recorder cabin. Limited by the installation space and wiring space of the in-pipeline detector, the circumferential resolution of the inner and outer wall defect discrimination probes along the pipeline is poor, and it cannot match the circumferential resolution of the magnetic flux leakage detection probe. Moreover, the analog signal is easily interfered during the transmission process.

[0005] Traditional deformation detection probes install an angle sensor at the position of the deformation probe rotating shaft and output 1 analog signal into the recorder cabin. The end of the deformation detection probe is a roller device in contact with the pipe wall, which is used to sense the real-time position of the pipe wall and can reduce the running friction. The analog signal is easily interfered during the transmission process. Summary of the Invention

[0006] In order to solve at least one problem in the background technology, the present invention proposes a composite detection device and method for inner and outer wall defects and pipeline deformation of pipelines, which solves the many shortcomings of existing inner and outer wall defect detection probes and deformation detection probes of pipelines, such as high power consumption, complex structure, and low circumferential resolution. At the same time, it reduces the power consumption and complexity of the probe, improves the circumferential resolution of inner and outer wall defect detection, and improves the anti-interference ability of signal transmission, so as to achieve higher-precision detection of pipeline defects.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A composite detection device for pipeline inner and outer wall defects and pipeline deformation, comprising:

[0009] The detection probe has a built-in detection circuit and is used to identify defects on the inner and outer walls of the pipeline from the inside of the pipeline;

[0010] A rotating shaft having an angle sensor built therein, wherein the angle sensor is used to detect the angle change of the probe arm caused by the deformation of the pipe wall;

[0011] The probe arm is used to fix the detection probe and the rotating shaft;

[0012] The base is rotatably matched with the rotating shaft, and has a built-in microcontroller and an analog-to-digital conversion circuit. The microcontroller and the analog-to-digital conversion circuit are used to collect angle change signals and inner wall and outer wall defect discrimination signals, and package them into digital signals and output them to the recorder;

[0013] The recorder is installed at the pipeline axis position and is connected to a plurality of evenly distributed bases along the circumference.

[0014] Preferably, in the detection probe, at least two detection circuits are provided, each detection circuit comprising:

[0015] U-shaped magnet, used to magnetize the tube wall;

[0016] Two sets of detection coils are respectively wound around the S pole and N pole of the U-shaped magnet to detect the magnetic field line signal of the magnetized area;

[0017] Two amplifying circuits, connected to corresponding detection coils, for amplifying magnetic field line signals;

[0018] A first signal line, connected to the amplifier circuit, for outputting an amplified magnetic field line signal;

[0019] The housing is used to install all detection circuits in the detection probe.

[0020] Preferably, two detection circuits are provided, and in the two detection circuits, the spacing between adjacent U-shaped magnets is equal to the distance between the S pole and the N pole of the U-shaped magnet.

[0021] Preferably, in the rotating shaft, the angle sensor is connected to a second signal line for outputting an angle change signal.

[0022] Preferably, inside the base, it includes:

[0023] An acquisition and transmission module for converting the defect discrimination signals of the inner wall and the outer wall and the angle change signal into digital signals and transmitting them to a recorder;

[0024] Leads for connecting the acquisition and transmission module to the recorder.

[0025] Preferably, in the acquisition and transmission module:

[0026] The analog-to-digital conversion circuit is used to convert the angle change signal and the defect discrimination signals of the inner wall and the outer wall into digital signals;

[0027] The microcontroller is connected to the analog-to-digital conversion circuit;

[0028] A signal driver for converting the digital signal into a high-speed differential digital signal.

[0029] Preferably, the leads include a third signal line and a power line;

[0030] The third signal line is used to connect the signal driver and the recorder;

[0031] The power line is used to supply power to the signal driver.

[0032] Preferably, the recorder includes an electronic package and a housing. The electronic package is located inside the housing and is connected to the acquisition and transmission module for storing digital signals or sending commands to the acquisition and transmission module;

[0033] The surface of the housing is used to mount the base.

[0034] A detection method for the above-mentioned composite detection device for inner and outer wall defects and pipeline deformation of a pipeline includes the following steps:

[0035] Install a plurality of bases on the recorder and distribute them evenly in the circumferential direction;

[0036] Place the recorder into the pipeline and set it coaxially with the pipeline;

[0037] Send a signal acquisition instruction from the recorder to the acquisition and transmission module;

[0038] The acquisition and transmission module sends an acquisition instruction to the detection probe and the angle sensor;

[0039] Discriminate the defects of the inner wall and the outer wall of the pipeline through the detection circuit and generate defect discrimination signals for the inner wall and the outer wall;

[0040] Obtain the angle change signal through an angle sensor;

[0041] Convert the defect discrimination signals and angle change signals of the inner wall and outer wall into digital signals through the acquisition and transmission module, and send them to the recorder for storage.

[0042] Advantages of the present invention:

[0043] 1. The device of the present invention integrates a detection probe and an angle sensor. The detection probe internally includes a detection coil, a U-shaped magnet, a small signal amplification circuit, etc. By selecting a magnet with an appropriate magnetic field strength and the corresponding number of turns of the induction coil, the circuit can not only detect the defects on the inner wall of the pipeline, but is insensitive to the defects on the outer wall of the pipeline, thus realizing the discrimination of the inner and outer walls of the pipeline defects; at the same time, the angle change generated by the deformation of the probe arm due to the deformation of the pipe wall is detected by the angle sensor and output as a deformation signal;

[0044] 2. The present invention improves the utilization rate of the probe structure and reduces the assembly complexity by combining the mechanical structures of the inner and outer wall defect detection probes and the deformation detection probes of the pipeline; by setting a multi-channel inner and outer wall defect discrimination circuit, the circumferential resolution of the inner and outer wall defect detection is improved; by setting a high-speed acquisition and transmission module, the signal transmission rate and anti-interference ability are improved, realizing a higher-precision detection of pipeline defects.

[0045] Other features and advantages of the present invention will be described in the following specification, and part of them will be obvious from the specification or understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained through the structures pointed out in the specification and the drawings. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 Shows the structural schematic diagram of a device for composite detection of inner and outer wall defects and pipeline deformation of the present invention;

[0048] Figure 2 Shows the schematic diagram of the detection circuit of the detection probe of the present invention;

[0049] Figure 3 Shows the magnetic field distribution diagram of the detection probe of the present invention;

[0050] Figure 4 Shows the composition schematic diagram of the acquisition and transmission module of the present invention;

[0051] Figure 5 shows the application scenario diagram of the device of the present invention in a pipeline;

[0052] Figure 6 shows the detection flow chart of a method for detecting defects on the inner and outer walls of a pipeline and pipeline deformation composite detection of the present invention.

[0053] In the figure: 10, pipeline; 20, detection probe; 21, detection circuit; 211, detection coil; 212, U-shaped magnet; 213, amplifier circuit; 22, housing; 23, first signal line; 30, probe arm; 40, rotating shaft; 41, angle sensor; 42, second signal line; 50, base; 51, acquisition and transmission module; 511, signal driver; 512, microcontroller; 513, analog-to-digital conversion circuit; 52, lead wire; 521, third signal line; 522, power supply line; 60, recorder; 61, electronic package; 62, cabin. Specific embodiments

[0054] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0055] A device for detecting defects on the inner and outer walls of a pipeline and pipeline deformation composite detection, as Figure 1 shown, includes: a detection probe 20, a probe arm 30, a rotating shaft 40, a base 50, and a recorder 60. Among them, the detection probe 20 is internally provided with a detection circuit 21 for discriminating defects on the inner and outer walls of the pipeline 10 from the inner side of the pipeline 10; the rotating shaft 40 is internally provided with an angle sensor 41, and the angle sensor 41 is used to detect the angle change of the probe arm 30 caused by the deformation of the pipe wall; the probe arm 30 is used to fixedly connect the detection probe 20 and the rotating shaft 40; the base 50 is rotationally matched with the rotating shaft 40, can collect the angle change signal, the defect discrimination signals of the inner and outer walls, and package them into digital signals and output them to the recorder 60; the recorder 60 is installed at the axial position of the pipeline 10 and is circumferentially connected to a plurality of evenly distributed bases 50.

[0056] It should be noted that in the Figure 1 structure, the rotating shaft 40 rotates relative to the base 50, and both ends of the probe arm 30 are fixedly connected to the rotating shaft 40 and the detection probe 20. Of course, in other embodiments, the rotating shaft 40 can also be fixedly connected to the base 50, and correspondingly, the probe arm 30 is rotatably connected to the rotating shaft 40.

[0057] It should be noted that the mechanical structure of the present invention includes the housing of the detection probe 20, the probe arm 30, the rotating shaft 40, and the base 50. The housing of the detection probe 20 provides an installation space for the inner and outer wall defect discrimination circuit and has high hardness and anti-slip ability, playing a protective role; the probe arm 30 is used to connect the detection probe 20 and the rotating shaft 40, and its length varies according to the inner diameter of the pipeline, so that the detection probe 20 can closely fit the inner wall of the pipeline 10, facilitating the detection of minute defects on the pipe wall; the rotating shaft 40 enables the detection probe 20 and the probe arm 30 to rotate when encountering changes in the inner diameter of the pipeline (such as dents or constrictions), giving the detector good passing ability; the base 50 is used to connect the rotating shaft 40 of the probe and the cabin body 62, providing a firm installation method.

[0058] Further, as Figure 2 shown, in the detection probe 20, there are two detection circuits 21. Each detection circuit 21 includes a detection coil 211, a U-shaped magnet 212, an amplification circuit 213, and a first signal line 23. The U-shaped magnet 212 magnetizes a local part of the pipe wall; there are two groups of detection coils 211, which are respectively wound around the S pole and the N pole of the U-shaped magnet 212, and are used to detect the abnormal magnetic field lines caused by defects on the inner wall of the magnetized area of the pipeline, generating magnetic field line signals; there are two amplification circuits 213, which are connected to the corresponding detection coils 211 and are used to amplify the magnetic field line signals; the first signal line 23 is connected to the amplification circuit 213 and can output the amplified magnetic field line signals to the acquisition and transmission module 51, and finally store them in the recorder 60. Finally, the housing 22 is used to install all the detection circuits 21 in the detection probe 20.

[0059] It should be noted that, in combination with Figure 1 and Figure 2 it can be known that the first signal line 23 is arranged in the probe arm 30 and extends through the rotating shaft 40 to the base 50. Therefore, the defect discrimination signals (including magnetic field line signals) of the inner wall and the outer wall can be transmitted to the acquisition and transmission module 51 through the first signal line 23 and finally to the recorder 60.

[0060] Further, as Figure 3 shown, in the two detection circuits 21, the distance between adjacent U-shaped magnets 212 is equal to the distance between the S pole and the N pole of the U-shaped magnet 212, forming a uniform weak magnetic field covering the area. During detection, since the detection coils 211 are respectively wound around the magnetic poles of the U-shaped magnet 212; the magnetization intensity of the U-shaped magnet 212 and the number of turns of the detection coil 211 are adjusted according to the pipe wall thickness, so that the signals generated by the detection coil 211 are not sensitive to defects on the outer wall of the pipeline 10 and can detect defects generated on the inner wall of the pipeline 10, realizing the determination of defect signals on the inner and outer walls of the pipeline 10.

[0061] It should be noted that the above device integrates the traditional inner and outer wall defect discrimination device of the pipeline 10 and the pipeline deformation detection device. It uses the passive sensing method of magnets and coils to replace the traditional eddy current-based inner and outer wall defect detection method of the pipeline 10. The traditional single-channel inner and outer wall defect discrimination circuit of the pipeline 10 is changed to a multi-channel one. Together with analog signals such as the deformation signal of the pipeline 10, they are synchronously converted from analog to digital and transmitted to the recorder 60 in the form of high-speed digital signals.

[0062] Furthermore, in Figure 1 , the angle sensor 41 is connected to a second signal line 42. The second signal line 42 can output an angle change signal to the acquisition and transmission module 51, and finally be stored in the recorder 60.

[0063] Furthermore, as Figure 4 shown, the base 50 mainly includes an acquisition and transmission module 51 and a lead 52. Among them, the acquisition and transmission module 51 is used to convert the defect discrimination signals of the inner and outer walls and the angle change signal into digital signals and transmit them to the recorder 60; the lead 52 is used to connect the acquisition and transmission module 51 and the recorder 60. Specifically, in the acquisition and transmission module 51, a microcontroller 512 and an analog-to-digital conversion circuit 513 are built in. Through the microcontroller 512 and the analog-to-digital conversion circuit 513, it is used to receive external control instructions and upload the digital signals formed after the conversion by the analog-to-digital conversion circuit 513 as a digital code stream. Among them, the analog-to-digital conversion circuit 513 can convert the angle change signal and the defect discrimination signals of the inner and outer walls into digital signals, then arrange the data in the channel order, and be converted by the signal driver 511 into high-speed differential digital signals suitable for long-distance transmission, and be transmitted to the recorder 60 through the third signal line 521 in the lead 52 of the acquisition and transmission module 51, and obtain power supply through the power line 522 therein.

[0064] In addition, the wiring structure in Figure 4 is as follows:

[0065] The first signal line 23 and the second signal line 42 are directly connected to multiple analog-to-digital conversion circuits 513, and the microcontroller 512 integrates all the analog-to-digital conversion circuits 513. The signal driver 511 is connected to the microcontroller 512, and the lead 52 is connected to the signal driver 511. Moreover, the lead 52 includes a third signal line 521 and a power line 522, where the third signal line 521 is used to connect the signal driver 511 and the recorder 60, and the power line 522 is used to supply power to the signal driver 511.

[0066] Furthermore, the recorder 60 includes an electronic package 61 and a cabin 62. The electronic package 61 is located inside the cabin 62 and is connected to the acquisition and transmission module 51, and is used to store digital signals or send commands to the acquisition and transmission module 51. The surface of the cabin 62 is used to mount the base 50.

[0067] It should be noted that, in combination with Figure 5 As can be seen, multiple high-resolution pipeline inner and outer wall defect and pipeline deformation composite detection devices are evenly installed on the cabin body 62 through the probe base 50 and connected to the electronic package 61 through the lead wire 52. After the system is powered on, the electronic package 61 issues commands to the acquisition and transmission module 51 through the lead wire 52 of the high-speed acquisition and transmission module 51, including commands for configuring the sampling frequency and commands for starting / stopping acquisition; after receiving the start acquisition command, the acquisition and transmission module 51 synchronously acquires the analog signals sent by the multi-channel inner and outer wall defect detection circuits 21 and the angle sensor 41, packs the data and transmits it to the electronic package 61 of the recorder 60 for storage.

[0068] A detection method, as Figure 6 shown, for a pipeline inner and outer wall defect and pipeline deformation composite detection device as described above, includes the following steps:

[0069] S1: Install multiple bases 50 on the recorder 60 and distribute them evenly along the circumferential direction;

[0070] S2: Place the recorder 60 into the pipeline 10 and set it coaxially with the pipeline 10;

[0071] S3: Send a signal acquisition instruction to the acquisition and transmission module 51 through the recorder 60;

[0072] S4: The acquisition and transmission module 51 sends acquisition instructions to the detection probe 20 and the angle sensor 41;

[0073] S5: Discriminate the defects of the inner wall and outer wall of the pipeline 10 through the detection circuit 21 and generate defect discrimination signals for the inner wall and outer wall;

[0074] S6: Obtain the angle change signal through the angle sensor 41;

[0075] S7: Convert the defect discrimination signals for the inner wall and outer wall and the angle change signal into digital signals through the acquisition and transmission module 51 and send them to the recorder 60 for storage.

[0076] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite detection device for pipeline inner and outer wall defects and pipeline deformation, characterized in that include: A detection probe (20) having a built-in detection circuit (21) for identifying defects on the inner wall and the outer wall of the pipeline (10) from the inside of the pipeline (10); The rotating shaft (40) has an angle sensor (41) built in it, and the angle sensor (41) is used to detect the angle change of the probe arm (30) caused by the deformation of the pipe wall; The probe arm (30) is used to fixedly connect the detection probe (20) and the rotating shaft (40); The base (50) is rotatably matched with the rotating shaft (40), and has a microcontroller (512) and an analog-to-digital conversion circuit (513) built therein, and is used to collect angle change signals and inner wall and outer wall defect discrimination signals through the microcontroller (512) and the analog-to-digital conversion circuit (513), and package them into digital signals and output them to the recorder (60); The recorder (60) is installed at the axial position of the pipeline (10) and is connected to a plurality of evenly distributed bases (50) along the circumferential direction.

2. The composite detection device for defects on the inner and outer walls of a pipeline and pipeline deformation according to claim 1, wherein, In the detection probe (20), at least two detection circuits (21) are provided, and each detection circuit (21) comprises: A U-shaped magnet (212) for magnetizing the tube wall; Two sets of detection coils (211), respectively wound around the S pole and N pole of the U-shaped magnet (212), are used to detect magnetic field line signals in the magnetized area; Two amplifying circuits (213) are connected to corresponding detection coils (211) and are used to amplify magnetic field line signals; A first signal line (23) connected to the amplifier circuit (213) and used for outputting an amplified magnetic field line signal; The housing (23) is used to install all detection circuits (21) in the detection probe (20).

3. The composite detection device for defects on the inner and outer walls of a pipeline and pipeline deformation according to claim 2, characterized in that, Two detection circuits (21) are provided, and in the two detection circuits (21), the spacing between adjacent U-shaped magnets (212) is equal to the distance between the S pole and the N pole of the U-shaped magnet (212).

4. The composite detection device for internal and external wall defects and pipeline deformation of a pipeline according to claim 1, characterized in that In the rotating shaft (40), the angle sensor (41) is connected to a second signal line (42), and the second signal line (42) is used to output an angle change signal.

5. The composite detection device for pipeline inner and outer wall defects and pipeline deformation according to claim 1, characterized in that, The base (50) includes: A collection and transmission module (51) is used to convert the defect identification signals and angle change signals of the inner wall and the outer wall into digital signals and transmit them to a recorder (60); The lead wire (52) is used to connect the data collection and transmission module (51) and the recorder (60).

6. The composite detection device for defects on the inner and outer walls of a pipeline and pipeline deformation according to claim 5, characterized in that, In the acquisition and transmission module (51): The analog-to-digital conversion circuit (513) is used to convert the angle change signal and the inner wall and outer wall defect discrimination signal into a digital signal; The microcontroller (512) is connected to an analog-to-digital conversion circuit (513); The signal driver (511) is used to convert the digital signal into a high-speed differential digital signal.

7. The composite detection device for defects on the inner and outer walls of a pipeline and pipeline deformation according to claim 6, characterized in that, The lead wire (52) includes a third signal wire (521) and a power wire (522); The third signal line (521) is used to connect the signal driver (511) and the recorder (60); The power line (522) is used to supply power to the signal driver (511).

8. A composite detection device for internal and external wall defects and pipeline deformation of a pipeline, according to any one of claims 5-7, characterized in that The recorder (60) includes an electronic package (61) and a housing (62). The electronic package (61) is located inside the housing (62) and is connected to the acquisition and transmission module (51) for storing digital signals or sending commands to the acquisition and transmission module (51). The surface of the housing (62) is used to mount the base (50).

9. A detection method, characterized in that, A composite detection device for inner and outer wall defects and pipeline deformation of a pipeline according to any one of claims 5-8.

10. A detection method according to claim 9, characterized in that, Comprising the following steps: Install a plurality of bases (50) on the recorder (60) and distribute them evenly in the circumferential direction. Place the recorder (60) into the pipeline (10) and set it coaxially with the pipeline (10). Send a signal acquisition instruction from the recorder (60) to the acquisition and transmission module (51). The acquisition and transmission module (51) sends acquisition instructions to the detection probe (20) and the angle sensor (41). Discriminate the defects on the inner and outer walls of the pipeline (10) through the detection circuit (21) and generate defect discrimination signals for the inner and outer walls. Obtain an angle change signal through the angle sensor (41). Convert the defect discrimination signals for the inner and outer walls and the angle change signal into digital signals through the acquisition and transmission module (51) and send them to the recorder (60) for storage.

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