Intelligent detection system for defects of salt cavern injection-production string

Abstract

The invention relates to a salt cavern injection-production string defect intelligent detection system, and aims to provide a salt cavern injection-production string defect intelligent detection system based on active excitation and multi-sensor fusion, after a salt cavern is constructed, a salt cavern gas storage continues to use an original injection-production string, so that a large amount of time and expenditure can be saved; however, performance evaluation on the residual life of an injection-production pipe column under the condition of a new circulating medium (such as natural gas) is particularly important when the injection-production pipe column is in a high-bittern corrosion, high-pressure and complex crustal stress environment in the early stage. Before gas storage is implemented, clear water is injected into a pipeline, the defects in the pipeline are detected on site through a detection device, active excitation and multi-sensor fusion are adopted, and related data are collected, so that a basis is provided for evaluating the residual life of a tubular column, and a real data support can be provided for establishing a digital twin model of the salt-cavern gas storage.

Description

Technical Field

[0001] The present invention relates to the technical field of safety monitoring of salt cavern gas storage reservoirs, and particularly to an intelligent detection system for defects in salt cavern injection-production strings based on active excitation and multi-sensor fusion. Background Technique

[0002] As an underground space resource, salt caverns have the advantages of good airtightness, high stability, and low cost, and are ideal carriers for large-scale energy storage. As an important facility for natural gas storage, the safe operation of the injection-production strings in salt cavern gas storage reservoirs directly affects energy supply security. During the cavity formation stage of salt cavern gas storage reservoirs, the cavity formation strings are long-term in a highly mineralized brine environment, and salt layer creep, formation collapse, etc. will cause deformation and damage to the cavity formation strings.

[0003] Patent CN201610313036.4 discloses a process for quickly constructing a salt cavern storage reservoir by asymmetric brine extraction from two wells, which uses a pipe cutting method to timely adjust the nozzle position of the production casing of the vertical well and control the shape of the underground dissolution cavity, so that the dissolution cavity of the vertical well finally meets the standard requirements of the salt cavern oil and gas storage reservoir. However, when constructing a cavity with standard saltification brine extraction from a common salt well, considering that the common salt well experiences 5-6 years of water injection and brine extraction to form a cavity, various uncertain factors will be generated during the cavity formation process. If a common salt well is used in the design, after the cavity formation is completed, the original two water injection and salt extraction wells are blocked, and two new gas storage wells are rebuilt at other positions to inject and produce natural gas to ensure the safety of gas storage. Although the safety of the new wells is guaranteed in this way, two more wells are built, and the costs in terms of time and economy are greatly increased. Therefore, considering continuing to use the original wells for gas injection and brine drainage, and brine injection and gas exhaust after the cavity formation is completed from the design stage of the original two-well injection-production wells, the investment in two wells can be reduced, the construction time can be saved, and the cost can be greatly reduced. During the cavity formation process of salt cavern gas storage reservoirs, the injection-production strings are long-term in highly mineralized brine, and defect problems such as corrosion cannot be ignored. Chloride ions in brine have strong penetration and adsorption abilities, which easily cause local corrosion and pitting corrosion of the strings, thereby weakening the strength of the strings. Experimental studies have shown that factors such as temperature, brine concentration, and flow rate will accelerate the corrosion of the strings. As the temperature increases, the corrosion rate increases significantly; the increase in brine concentration will also accelerate the corrosion rate; the increase in flow rate will also exacerbate the corrosion. These factors act together to further weaken the strength and service life of the cavity formation strings. Therefore, the defect detection and remaining life prediction of salt cavern injection-production strings are particularly important for the safe use of gas storage reservoirs.

[0004] Patent CN202411567969.7 discloses monitoring pressure, temperature, flow rate, stress, and humidity through multiple sensors, enabling real-time acquisition of the state of the underground environment, thereby establishing a digital twin monitoring method for an underground salt cavern gas storage in a compressed air energy storage power station. The requirements for predicting the defects and remaining life of the injection and production string based on the multi-sensor detection data proposed in this patent are passive and indirect. The relevant detection data cannot provide dynamic parameters of the pipeline mechanical properties, making it difficult to construct a high-precision virtual model. Due to factors such as interference and noise in the collected signals, it may not be possible to meet the accurate prediction of the string defects and remaining life.

[0005] Currently, most of the defects and remaining life of the injection and production string are predicted by methods such as theoretical calculation and computer simulation as evaluation means. After the salt cavern is completed with cavity formation and before gas storage is implemented, by placing an intelligent defect detection device into the casing, on-site detection of the casing defects is carried out, using active excitation and multi-sensor fusion, thereby providing a basis for evaluating the remaining life of the string and can provide real data support for the establishment of the digital twin model of the salt cavern gas storage. Summary of the Invention

[0006] The purpose of the present invention is to provide an intelligent detection system for defects in the salt cavern injection and production string. After the salt cavern is completed with cavity formation, the original injection and production string can be used in the salt cavern gas storage, which can save a large amount of time and funds. However, it is particularly important to evaluate the performance of the remaining life of the injection and production string in the early stage under the high salt brine corrosion, high pressure, and complex in-situ stress environment and in the face of new flowing medium (such as natural gas) conditions. Before gas storage is implemented, clean water is injected into the pipeline, and on-site detection of the defects on the inner wall of the pipeline is carried out through the detection device, using active excitation and multi-sensor fusion to collect relevant data, thereby providing a basis for evaluating the remaining life of the string and can provide real data support for the establishment of the digital twin model of the salt cavern gas storage.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The intelligent detection system for defects in the salt cavern injection and production string described includes: an intelligent defect detection device, a sensor array, and a data acquisition and defect database system.

[0009] The intelligent defect detection device includes: a left support rod, an impact rod, an elastic sealing sleeve, a left bevel gear, a lifting ring, a cam motor, a camshaft, a right support rod, a right bevel gear, a gear rack, an impact cam, a spring plate, an elastic retaining ring, a battery, a transmission motor, a drive motor, a propeller, a lower bevel gear, a controller, a camera, and a housing.

[0010] The housing of the intelligent defect detection device is a sealed container made of corrosion-resistant stainless steel material.

[0011] A battery and a drive motor are installed in the described housing, which can drive the lower bevel gear to rotate. The left bevel gear and the right bevel gear are installed in the housing through a gear rack. The lower bevel gear rotates and meshes with the left bevel gear and the right bevel gear respectively, driving the left bevel gear and the right bevel gear to rotate.

[0012] The inner holes of the drive shafts of the left bevel gear and the right bevel gear have left-handed internal threads and right-handed internal threads, which cooperate with the external threads on the surfaces of the left support rod and the right support rod. The threads of the left support rod and the right support rod are left-handed external threads and right-handed external threads respectively. In this way, when the left bevel gear and the right bevel gear mesh and rotate with the lower bevel gear, the left support rod and the right support rod extend to the left and right sides respectively through screw drive. The left support rod and the right support rod extend to the inner wall of the pipeline. After a delay, the drive motor reverses, driving the lower bevel gear to rotate. The lower bevel gear rotates and meshes with the left bevel gear and the right bevel gear respectively, driving the left bevel gear and the right bevel gear to rotate. The left support rod and the right support rod retract inward respectively through screw drive.

[0013] An impact rod is placed in the inner hole of the left support rod, and its length is shorter than the inner hole, so it can move freely in the inner hole.

[0014] The cam motor drives the camshaft to rotate. Multiple spring plates are installed on the camshaft. The spring plates can drive the impact cam sleeved on the camshaft to rotate. The impact cam is limited by an elastic retaining ring. When the impact cam rotates to the lift position, it drives the impact rod to quickly move to the left side of the left support rod and impact on the left end face of the left support rod. When the left support rod extends to the inner wall of the pipeline, the impact rod transmits the impact force to the inner wall of the pipeline through the left end face of the left support rod, completing an impact on the inner wall of the pipeline. The physical signals such as vibration, sound wave, and stress wave generated by the impact will be received by the sensor array installed on the outer wall of the pipeline.

[0015] When the rotation of the impact cam is blocked, the spring plate can act as an overrunning clutch. By adjusting the elastic force and length of the spring plate, the output torque of the impact cam can be controlled.

[0016] Furthermore, by changing the lift size of different impact cams, the output torque of the impact cam can be controlled.

[0017] The drive motor in the described housing is powered by a battery. Below the housing, a propeller is installed and driven by the drive motor, which facilitates the movement of the intelligent defect detection device in water.

[0018] The elastic sealing sleeves are installed on both sides of the housing. The left support rod and the right support rod extend or retract within the protective sleeves, and the outer ends of the elastic sealing sleeves are sealed and connected to the left support rod and the right support rod.

[0019] A controller is installed in the housing, which is used to control the start, stop, and overload protection of the drive motor, the drive motor, and the cam motor.

[0020] Furthermore, the controller can control the cam motor to adopt multi-mode (single-shot, continuous, gradient) impacts;

[0021] Furthermore, the controller can control the drive motor to start at a predetermined position of the pipeline to achieve impacts on the inner wall of the pipeline;

[0022] Furthermore, the controller includes the use of inertial navigation technology to measure acceleration and angular velocity data to achieve the positioning accuracy inside the casing;

[0023] Furthermore, the controller can mark the position of each impact on the inner wall of the pipeline, and the calibrated position information can be synchronously matched and recorded according to the sensors installed on the outer wall of the pipeline.

[0024] A camera is installed in the described housing for recording the image information of the inner wall of the pipeline;

[0025] Furthermore, considering the transparency of the water quality inside the pipeline, an infrared camera can be selected to record the infrared image information of the inner wall of the pipeline for defect analysis of the pipeline;

[0026] Furthermore, a transparent window is installed on the housing for the infrared camera to take pictures.

[0027] The lifting ring on the described housing can be installed with a cable for the release and recovery of the intelligent defect detection device;

[0028] Furthermore, cables and optical cables can be added to supply power and transmit data information for the intelligent defect detection device.

[0029] Each device in the described housing needs to be sealed.

[0030] The described sensor array can be installed at the outlet part of the casing;

[0031] Furthermore, during the construction of the casing of the injection-production string in salt cavern well drilling, the sensor array can be synchronously installed on the outer wall surface of the casing, and the signal is transmitted through optical fiber to meet the real-time requirement of the signal. At the same time, the installation position is marked to determine the signal receiving position points of each sensor.

[0032] The described sensor array includes: an acoustic emission sensor array;

[0033] Furthermore, it can be an ultrasonic sensor array.

[0034] The described data acquisition and defect database system can complete the multi-source data information collected by the intelligent defect detection device and the sensor array, and incorporate the defect data information obtained by the intelligent defect detection device in the laboratory during the detection of the casing of the same material into the defect database;

[0035] Furthermore, the relevant data analysis and processing of the data acquisition and defect database system can provide rich information for predicting the remaining life of the salt cavern well pipe, which is an important data source for the data-driven prediction method;

[0036] Furthermore, by combining advanced data analysis techniques, such as machine learning and deep learning algorithms, these data can be deeply mined to establish a casing defect data model;

[0037] Furthermore, the real-time data obtained by detection can be input into the digital twin model of the salt cavern gas storage to make the virtual model more accurately simulate the actual situation of the well pipe.

[0038] In the content description of the present invention, the casing and pipeline of the salt cavern injection-production string both refer to the channels of the salt cavern brine extraction and gas storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of an intelligent defect detection system for a salt cavern injection-production string according to an embodiment of the present invention. In the figure: 1 - casing, 2 - intelligent defect detection device, 3 - acoustic emission sensor array, 4 - data acquisition and defect database system.

[0040] Figure 2 It is a schematic structural diagram of the intelligent defect detection device of an intelligent defect detection system for a salt cavern injection-production string according to an embodiment of the present invention. In the figure: 201 - left support rod, 202 - impact rod, 203 - elastic sealing sleeve, 204 - left bevel gear, 205 - lifting ring, 206 - cam motor, 207 - camshaft, 208 - right support rod, 209 - right bevel gear, 210 - gear rack, 211 - impact cam, 212 - spring plate, 213 - elastic retaining ring, 214 - battery, 215 - drive motor, 216 - driving motor, 217 - propeller, 218 - lower bevel gear, 219 - controller, 220 - camera, 221 - housing.

[0041] Figure 3 It is a schematic diagram of the contour curve of the impact cam according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following combines Figure 1 , Figure 2 , Figure 3 to give a preferred embodiment of an intelligent defect detection system for a salt cavern injection-production string of the present invention to illustrate the structural features, technical performance and functional characteristics of the present invention, rather than to limit the scope of the present invention.

[0043] Figure 1 It represents an intelligent defect detection system for a salt cavern injection-production string, including: casing 1, intelligent defect detection device 2, acoustic emission sensor array 3, data acquisition and defect database system 4;

[0044] Figure 2 An intelligent defect detection device for an intelligent detection system of salt cavern injection-production string defects according to an embodiment of the present invention;

[0045] Figure 3 It is the impact cam contour curve of an intelligent detection system for salt cavern injection-production string defects.

[0046] The intelligent detection system for salt cavern injection-production string defects includes: an intelligent defect detection device, a sensor array, and a data acquisition and defect database system; the intelligent defect detection device operates in the clear water of the casing. The propeller is driven by a motor, and the intelligent defect detection device moves downward along the casing opening. At a set position, the intelligent defect detection device uses an impact rod to impact the inner wall of the casing to achieve active excitation. The sensor array on the outer wall of the casing receives signals generated by various physical quantities and transmits them to the data acquisition and defect database system through an optical cable. At the same time, the image of the inner wall of the casing recorded by the camera in the intelligent defect detection device is synchronously transmitted to the data acquisition and defect database system or stored in the camera. The positioning device in the controller of the intelligent defect detection device records the position when the inner wall is impacted. The relevant data information is processed and analyzed in the data acquisition and defect database system, so as to provide a basis for evaluating the remaining life of the pipe string and can provide real data support for the establishment of the digital twin model of the salt cavern gas storage.

[0047] The intelligent defect detection device includes: a left support rod, an impact rod, an elastic seal, a left bevel gear, a lifting ring, a cam motor, a camshaft, a right support rod, a right bevel gear, a gear rack, an impact cam, a spring plate, an elastic retaining ring, a battery, a transmission motor, a drive motor, a propeller, a lower bevel gear, a controller, a camera, and a housing.

[0048] The housing of the intelligent defect detection device is a sealed container made of corrosion-resistant stainless steel material.

[0049] A battery and a transmission motor are installed in the housing, which can drive the lower bevel gear to rotate. The left bevel gear and the right bevel gear are installed in the housing through a gear rack. The rotation of the lower bevel gear meshes with the left bevel gear and the right bevel gear respectively, driving the left bevel gear and the right bevel gear to rotate.

[0050] The inner holes of the left bevel gear and the right bevel gear drive shafts have left-handed internal threads and right-handed internal threads, which are matched with the external threads on the surfaces of the left support rod and the right support rod. The threads of the left support rod and the right support rod are left-handed external thread and right-handed external thread respectively. In this way, when the left bevel gear and the right bevel gear mesh and rotate with the lower bevel gear, through screw drive, the left support rod and the right support rod extend out to the left and right sides respectively, and the left support rod and the right support rod extend to the inner wall of the pipeline; after a delay, the drive motor reverses, driving the lower bevel gear to rotate. The lower bevel gear rotates and meshes with the left bevel gear and the right bevel gear respectively, driving the left bevel gear and the right bevel gear to rotate, and the left support rod and the right support rod retract inward through screw drive.

[0051] An impact rod is placed in the inner hole of the left support rod, and its length is shorter than the inner hole, and it can move freely in the inner hole.

[0052] The cam motor drives the camshaft to rotate. Multiple spring pieces are installed on the camshaft. The spring pieces can drive the impact cam sleeved on the camshaft to rotate. The impact cam is limited by an elastic retaining ring. When the impact cam rotates to the lift position, it drives the impact rod to quickly move to the left side of the left support rod and impact on the left end face of the left support rod. When the left support rod extends to the inner wall of the pipeline, at this time, the impact rod transmits the impact force to the inner wall of the pipeline through the left end face of the left support rod, completing an impact on the inner wall of the pipeline. The physical signals such as vibration, sound wave, and stress wave generated by the impact will be received by the sensor array installed on the outer wall of the pipeline.

[0053] The cam motor drives the camshaft to rotate. Multiple spring pieces are installed on the camshaft. The spring pieces can drive the impact cam sleeved on the camshaft to rotate. When the rotation of the impact cam is blocked, the spring pieces can play the role of an overrunning clutch. By adjusting the elastic force and length of the spring pieces, the output torque of the impact cam can be controlled;

[0054] Furthermore, by replacing the lift size of different impact cams, the output torque of the impact cam can be controlled.

[0055] The drive motor in the housing is powered by a battery. Below the housing, a propeller is installed and driven by the drive motor, which facilitates the movement of the intelligent defect detection device in water.

[0056] The elastic sealing sleeves are installed on both sides of the housing. The left support rod and the right support rod extend or retract within the protective sleeves, and the outer ends of the elastic sealing sleeves are hermetically connected to the left support rod and the right support rod.

[0057] A controller is installed in the housing, which is used to control the start, stop, and overload protection of the drive motor, the drive motor, and the cam motor;

[0058] Furthermore, the controller can control the cam motor to perform multi-mode (single-shot, continuous, gradient) impacts;

[0059] Furthermore, the controller can control the drive motor to start at a predetermined position of the pipeline to achieve an impact on the inner wall of the pipeline;

[0060] Furthermore, the controller includes the use of inertial navigation technology to measure acceleration and angular velocity data to achieve the positioning accuracy inside the casing;

[0061] Furthermore, the controller can mark the position of each impact on the inner wall of the pipeline, and the calibrated position information can be synchronously matched and recorded according to the sensors installed on the outer wall of the pipeline.

[0062] A camera is installed in the housing to record the image information of the inner wall of the pipeline;

[0063] Furthermore, considering the transparency of the water quality in the pipeline, an infrared camera can be selected to record the infrared image information of the inner wall of the pipeline for defect analysis of the pipeline;

[0064] Furthermore, a transparent window is installed on the housing for the infrared camera to take pictures.

[0065] The lifting ring on the housing can be installed with a cable for the release and recovery of the intelligent defect detection device;

[0066] Furthermore, cables and optical cables can be added to supply power and transmit data information for the intelligent defect detection device.

[0067] Each device in the housing needs to be sealed.

[0068] The sensor array can be installed at the outlet of the casing;

[0069] Furthermore, during the construction of the casing of the injection-production string in salt cavern well drilling, the sensor array can be synchronously installed on the outer wall surface of the casing, and the signal is transmitted through the optical fiber to meet the real-time requirement of the signal. At the same time, the installation position is marked to determine the signal receiving position points of each sensor.

[0070] The sensor array includes: an acoustic emission sensor array;

[0071] Furthermore, it can be an ultrasonic sensor array.

[0072] The data acquisition and defect database system can complete the multi-source data information collected by the intelligent defect detection device and the sensor array, and incorporate the defect data information obtained by the intelligent defect detection device in the detection of the casing of the same material in the laboratory into the defect database;

[0073] Furthermore, the relevant data analysis and processing of the data acquisition and defect database system can provide rich information for predicting the remaining life of the salt cavern well pipe, and is an important data source for the data-driven prediction method;

[0074] Furthermore, combined with advanced data analysis technologies such as machine learning and deep learning algorithms, these data can be deeply mined to establish a casing defect data model.

[0075] Furthermore, the real-time data obtained by detection can be input into the digital twin model of the salt cavern gas storage to make the virtual model more accurately simulate the actual situation of the well pipe.

[0076] The beneficial effects of the present invention are as follows:

[0077] By combining the intelligent defect detection device with the acoustic emission sensor, the present invention adopts active excitation and multi-sensor fusion, thereby providing a basis for evaluating the remaining life of the pipe string, and can provide real data support for the establishment of the digital twin model of the salt cavern gas storage, realizing an efficient and reliable solution for the defect detection of the salt cavern injection and production pipe string, and having broad application prospects and economic value.

[0078] In summary, the above is the content of the embodiments of the present invention. Obviously, the implementation manners of the present invention are not limited to this. The description of specific implementation manners is only to help understand the present invention, rather than to limit the present invention. Any person skilled in the art can make some modifications and changes using the idea of the present invention. As long as their technical means do not depart from the idea and key points of the present invention, they are still within the protection scope of the present invention.

Claims

1. An intelligent detection system for defects in salt cavern injection-production string, characterized in that, Comprising: Intelligent defect detection device, sensor array, and data acquisition and defect database system; The intelligent defect detection device includes: left support rod, impact rod, elastic seal sleeve, left bevel gear, hanging ring, cam motor, camshaft, right support rod, right bevel gear, gear rack, impact cam, spring leaf, elastic retaining ring, battery, transmission motor, drive motor, propeller, lower bevel gear, controller, camera, and housing.

2. The intelligent defect detection device according to claim 1, wherein: A battery and a transmission motor are installed in the housing, which can drive the lower bevel gear to rotate. The left bevel gear and the right bevel gear are installed in the housing through a gear rack. When the lower bevel gear rotates, it meshes with the left bevel gear and the right bevel gear respectively, driving the left bevel gear and the right bevel gear to rotate; The inner holes of the driving shafts of the left bevel gear and the right bevel gear have left-handed internal threads and right-handed internal threads, which cooperate with the external threads on the surfaces of the left support rod and the right support rod. The threads of the left support rod and the right support rod are left-handed external threads and right-handed external threads respectively. In this way, when the left bevel gear and the right bevel gear mesh and rotate with the lower bevel gear, through screw drive, the left support rod and the right support rod extend out to the left and right sides respectively, and the left support rod and the right support rod extend to the inner wall of the pipeline; after a delay, the transmission motor reverses, driving the lower bevel gear to rotate. The lower bevel gear rotates and meshes with the left bevel gear and the right bevel gear respectively, driving the left bevel gear and the right bevel gear to rotate, and through screw drive, the left support rod and the right support rod retract inward respectively.

3. The intelligent defect detection device according to claim 1, wherein: An impact rod is placed in the inner hole of the left support rod, and its length is shorter than the inner hole, and it can move freely in the inner hole; The cam motor drives the camshaft to rotate. Multiple spring leaves are installed on the camshaft. The spring leaves can drive the impact cam sleeved on the camshaft to rotate. The impact cam is limited by an elastic retaining ring. When the impact cam rotates to the lift position, it drives the impact rod to quickly move to the left side of the left support rod and impact on the left end face of the left support rod. When the left support rod extends to the inner wall of the pipeline, at this time, the impact rod transmits the impact force to the inner wall of the pipeline through the left end face of the left support rod, completing an impact on the inner wall of the pipeline. The physical signals such as vibration, sound wave, and stress wave generated by the impact will be received by the sensor array installed on the outer wall of the pipeline.

4. The intelligent defect detection device according to claim 1, wherein: When the rotation of the impact cam is blocked, the spring leaf on the camshaft can play the role of an overrunning clutch. By adjusting the elastic force and length of the spring leaf, the output torque of the impact cam can be controlled; Furthermore, by replacing the lift size of different impact cams, the output torque of the impact cam can be controlled.

5. The intelligent defect detection device according to claim 1, wherein: The elastic seal sleeve is installed on both sides of the housing. The left support rod and the right support rod extend or retract within the protective sleeve, and the outer end of the elastic seal sleeve is hermetically connected to the left support rod and the right support rod.

6. The intelligent defect detection device according to claim 1, wherein: A controller is installed in the described housing to control the startup, stop, and overload protection of the transmission motor, drive motor, and cam motor; Further, the controller can control the cam motor to perform impacts in multiple modes (single, continuous, gradient); Further, the controller can control the transmission motor to start at a predetermined position in the pipeline to achieve impacts on the inner wall of the pipeline; Further, the controller includes an inertial navigation technology to measure acceleration and angular velocity data to achieve the positioning accuracy inside the casing; Further, the controller can mark the position of each impact on the inner wall of the pipeline, and the calibrated position information can be synchronously matched and recorded according to the sensors installed on the outer wall of the pipeline.

7. The intelligent defect detection device according to claim 1, wherein: A camera is installed in the described housing to record the image information of the inner wall of the pipeline; Further, considering the transparency of the water quality inside the pipeline, an infrared camera can be selected to record the infrared image information of the inner wall of the pipeline for defect analysis of the pipeline; Further, a transparent window is installed on the housing for the infrared camera to take pictures.

8. The intelligent detection system for salt cavern injection-production string defects according to claim 1, wherein: The described sensor array can be installed at the outlet of the casing; Further, during the construction of the casing of the injection-production string when creating a salt cavern well, the sensor array can be synchronously installed on the outer wall of the casing, and the signals are transmitted through optical fibers to meet the real-time signal requirements. At the same time, the installation positions are marked to determine the signal receiving position points of each sensor.

9. The intelligent detection system for salt cavern injection-production string defects according to claim 1, wherein: The described sensor array can be an acoustic emission sensor array; Further, it can be an ultrasonic sensor array.

10. The intelligent detection system for salt cavern injection-production string defects according to claim 1, wherein: The data acquisition and defect database system can complete the multi-source data information collected by the intelligent defect detection device and the sensor array, and incorporate the defect data information obtained by the intelligent defect detection device in the laboratory during the detection of casings of the same material into the defect database; Further, the relevant data analysis and processing of the data acquisition and defect database system can provide rich information for predicting the remaining life of the salt cavern well pipe, and is an important data source for the data-driven prediction method; Further, combined with advanced data analysis technologies, such as machine learning and deep learning algorithms, these data can be deeply mined to establish a casing defect data model; Further, the real-time data obtained from the detection can be input into the digital twin model of the salt cavern gas storage reservoir to make the virtual model more accurately simulate the actual situation of the well pipe.

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