A deepwater riser multi-parameter real-time monitoring device

Abstract

The application discloses a kind of deepwater riser multi-parameter real-time monitoring device, it is related to ship and ocean engineering field, including sensor fixing device, optical fiber sensor is installed on sensor fixing device, including optical fiber strain sensor, optical fiber acceleration sensor and optical fiber temperature sensor, real-time monitoring strain, acceleration and temperature signal at different positions of deepwater riser;Optical fiber junction box is installed on sensor fixing device, is connected with optical fiber sensor by optical cable, for by optical cable the multi-parameter data collected real-time transmission to the structure health monitoring system arranged on underwater or mother ship;Cable anti-twist device includes mounting bracket fixedly arranged on sensor fixing device, mounting bracket is opened with the optical fiber channel for installing optical cable. The application can realize the overall integration of multiple types of optical fiber sensors, efficient fixation and convenient installation, while preventing the attenuation of optical fiber signal transmission and the destructive influence on optical cable caused by the twisting of optical cable in complex marine environment.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding and marine engineering technology, and in particular to a real-time multi-parameter monitoring device for deep-water risers. Background Technology

[0002] Marine engineering, especially deep-sea engineering, is a crucial means for humankind to explore marine oil and gas resources. As the lifeline of offshore oil and gas production, riser systems play a vital role in the development of marine oil and gas resources. However, with increasing water depth, especially in areas with harsh sea conditions and oil fields with high temperatures and pressures, the harsh operating environment severely reduces the service life of riser structures. Damage to riser systems can lead to oil and gas leaks, causing not only economic losses but also pollution of the marine environment and secondary disasters. Therefore, health monitoring of deep-sea riser structures is particularly important.

[0003] In the health monitoring of deep-sea riser structures, fiber optic sensing technology provides reliable technical support for the health monitoring of deep-sea mixed-transport equipment due to its advantages such as high linearity, high sensitivity, and long-distance signal transmission. By deploying fiber optic sensors for strain, vibration, and other parameters on the deep-sea riser structure, the dynamic characteristic response of the structure during service can be monitored in real time, and relevant monitoring / early warning indicators can be constructed, enabling condition monitoring / early warning of the deep-sea riser structure. However, the harsh environment of deep waters and the short window of opportunity for offshore engineering operations make the integration and rapid installation and deployment of multiple fiber optic sensors a major challenge limiting the health monitoring of deep-sea risers.

[0004] Traditional fiber optic sensor mounting methods include pasting / welding to the structural surface and embedding within the structure. The drawbacks are: (1) Various types of fiber optic sensors are complex and diverse, making unified integration and deployment difficult, and preventing the synchronous acquisition of multiple types of signals at the same location on the riser; (2) Once the fiber optic sensor is pasted / welded to the structural surface or embedded within the structure, the sensor cannot be reused, and its measuring points cannot be changed, resulting in poor monitoring flexibility; (3) Directly embedding or welding the sensor will damage the riser structure, making it counterproductive; (4) During installation and deployment, fiber optic sensors are prone to cable entanglement, twisting, or even breakage, leading to sensor failure; (5) The traditional method of sensor repair and replacement is extremely difficult; if one sensor fails, all sensors must be replaced.

[0005] Therefore, there is an urgent need to design a solution that can integrate multiple types of fiber optic sensors, quickly and efficiently fix and install them, while preventing the fiber optic cable from twisting, ensuring the monitoring performance of the fiber optic sensors, and improving efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-parameter real-time monitoring device for deep-water risers to solve the problems existing in the prior art. It can achieve the overall integration, efficient fixing and convenient installation of various types of fiber optic sensors. At the same time, it can prevent the attenuation of fiber optic signal transmission and damage to the fiber optic cable caused by the twisting of the fiber optic cable in the complex marine environment, thereby ensuring the monitoring performance of fiber optic sensors in long-term underwater monitoring environments and improving the quality and efficiency of monitoring data.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a multi-parameter real-time monitoring device for deep-water risers, comprising:

[0009] The sensor mounting device includes a clamp that can be fastened to the outer wall of a deep water riser;

[0010] The fiber optic sensors, mounted on the sensor fixing device, include a fiber optic strain sensor, a fiber optic accelerometer, and a fiber optic temperature sensor. These sensors can monitor strain, acceleration, and temperature signals at different locations on the deep-water riser, enabling real-time synchronous monitoring of ambient temperature, structural stress, and vibration status at the same underwater location on the riser. The measured strain value is corrected using a strain coefficient k to obtain the true strain value at the measurement location on the riser. The strain coefficient k is obtained through numerical fitting after verification using multi-condition experimental results and a finite element mathematical model.

[0011] The fiber optic junction box is installed on the sensor fixing device and connected to the fiber optic sensor via an optical cable. It is used to transmit the collected multi-parameter data in real time to the structural health monitoring system deployed underwater or on the mother ship via the optical cable.

[0012] The cable anti-twist device includes a mounting bracket fixedly mounted on the sensor fixing device. The mounting bracket has an optical fiber channel for mounting the optical cable. Fixing the optical cable in the optical fiber channel formed by compression can prevent the device from dragging or twisting the optical cable, causing damage, or causing excessive twisting to interfere with the optical fiber signal transmission. It can achieve zero exposure of the optical fiber cable in the marine environment, avoid direct contact with the seawater environment, and reduce damage to the optical fiber cable line caused by seawater erosion, marine organism attachment, and other factors.

[0013] In practical applications, this invention pre-fixes fiber optic sensors onto a sensor mounting device. During the deep-water riser lowering process, the integrated device is installed at a predetermined location. The collected multi-parameter data is transmitted in real-time to a structural health monitoring system via fiber optic cable. This structural health monitoring system is an existing monitoring system, which will not be elaborated upon here. This invention achieves real-time acquisition of multi-parameter characteristic responses of underwater temperature, stress, and vibration of the deep-water riser structure. It offers advantages such as convenient installation and removal, high repeatability, synchronous sensing of underwater multi-parameter characteristics, and accurate and reliable data acquisition. This provides effective technical support for the safe operation and maintenance of deep-water oil and gas resource extraction / exploration equipment.

[0014] Optionally, the clamp includes an upper clamp and a lower clamp connected by a metal strip. The upper clamp and the lower clamp are respectively fitted onto the outer wall of the deep water riser, and the inner diameter of the upper clamp and the lower clamp can be adjusted. The fiber optic sensor and the fiber optic junction box are disposed between the upper clamp and the lower clamp.

[0015] Optionally, the upper clamp includes a first clamp and a third clamp, which are symmetrically arranged at the same height on both sides of the deep-water riser, and after being fixedly connected, they hug the outer wall of the deep-water riser; the lower clamp includes a second clamp and a fourth clamp, which are symmetrically arranged at the same height on both sides of the deep-water riser, and after being fixedly connected, they hug the outer wall of the deep-water riser; the third clamp and the fourth clamp are connected by a metal strip. This invention uses high-strength bolts to fix the first and third clamps, as well as the second and fourth clamps, to the outer wall of the deep-water riser for the fixing and integration of the aforementioned fiber optic sensor. Furthermore, the sensor fixing device is customized according to the dimensions of the deep-water riser, enabling accurate transmission and measurement of structural stress and vibration in the deep-water riser.

[0016] Optionally, multiple mounting brackets are connected between the upper clamp and the lower clamp. Each mounting bracket includes a base bracket, and the fiber optic strain sensor, fiber optic accelerometer, and fiber optic junction box are respectively fixedly connected to their respective base brackets. The fiber optic temperature sensor is fixed to the upper part of one of the fiber optic accelerometers.

[0017] Optionally, two fiber optic strain sensors and two fiber optic accelerometers are each provided; the angle between the two fiber optic strain sensors and the two fiber optic accelerometers along the circumference of the deep-water riser is 90°. That is, the vertical projections of the two fiber optic strain sensors are respectively connected to the vertical projection of the central axis of the deep-water riser, and the angle between the two lines is 90°; the vertical projections of the two fiber optic accelerometers are respectively connected to the vertical projection of the central axis of the deep-water riser, and the angle between the two lines is 90°. This allows for the simultaneous measurement of the three-dimensional vibration response signal of the deep-water riser structure. The fiber optic junction box is fused to the fiber optic strain sensor, fiber optic accelerometer, and fiber optic temperature sensor via a five-core fiber optic cable; alternatively, the junction box is fused to the fiber optic strain sensor, fiber optic accelerometer, and fiber optic temperature sensor via a one-core fiber optic cable using a fiber optic splitter with a splitting ratio of 1:5; or the junction box is fused to the fiber optic strain sensor and fiber optic accelerometer via a three-core fiber optic cable using a fiber optic splitter with a splitting ratio of 1:2, with the third fiber optic cable fused to the fiber optic temperature sensor. The three fiber optic sensors are integrated in a compact location, ensuring the accuracy of compensation from the temperature sensor to the strain sensor during testing.

[0018] Optionally, the mounting bracket further includes a fixing bracket, which is fixedly disposed on the outside of the base bracket. One end of the fixing bracket is connected to the outside of the first clamp or the third clamp. An optical fiber channel is formed between the fixing bracket and the base bracket, and this optical fiber channel serves as a cable anti-twist device, preventing damage to the optical cable caused by dragging or twisting. This invention uses a cable anti-twist device to fix the optical cable, effectively preventing entanglement, twisting, or even breakage during installation and deployment, which could lead to a decrease in optical fiber signal strength and ensure the normal operation of the sensor after transportation and installation.

[0019] Optionally, the mounting bracket further includes an arc-shaped fixing frame; a fixing groove is provided on the outer wall of the first clamp and the third clamp, and an arc-shaped groove is provided between two adjacent fixing grooves. One end of the fixing bracket is engaged with the corresponding fixing groove, and the arc-shaped fixing frame is fixedly installed in the arc-shaped groove. The optical fiber channel is provided on the inner side of the arc-shaped fixing frame.

[0020] Optionally, the fiber optic temperature sensor is fixedly mounted on a fixed bracket connected to the upper part of one of the fiber optic accelerometers; the end of the fiber optic temperature sensor is provided with a curved columnar fixed bracket, and the optical cable connected to the fiber optic temperature sensor passes through the columnar fixed bracket.

[0021] Optionally, the diameter of the deep-water riser is D, the thickness of the arc-shaped fixing bracket and the base support are both 0.02D, and the width is both 0.1D; the length of the base support is 1.5D. This proportional relationship is the optimal solution for the simultaneous deformation of the clamp and the deep-water riser in this invention.

[0022] Optionally, the fiber optic strain sensor is embedded in the groove machined on the corresponding base bracket and then sealed with adhesive to avoid directly sticking it to the surface of the corresponding fixed bracket, which would cause stress concentration and thus reduce measurement error.

[0023] The present invention achieves the following technical effects compared to the prior art:

[0024] This invention solves the problem of complex and diverse sensor types and difficulties in unified integration and deployment in traditional fiber optic sensor deployment methods. It achieves simultaneous acquisition of multiple types of signals from fiber optic strain, acceleration, and temperature sensors at designated locations on deep-water risers. This invention uses clamps to secure the fiber optic sensors to the deep-water risers, avoiding damage to the risers compared to traditional pre-embedding or welding methods. The anti-twist device effectively prevents signal strength degradation caused by tangling, twisting, or even breakage of the fiber optic cable during installation, ensuring normal sensor operation after transportation and installation. Branching the fiber optic cable through a junction box ensures that the failure of one sensor does not affect the performance of other sensors, facilitating convenient replacement and maintenance at low cost. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the deep-water riser multi-parameter real-time monitoring device of the present invention;

[0027] Figure 2 This is a front view of the deep-water riser multi-parameter real-time monitoring device of the present invention installed on the deep-water riser.

[0028] Figure 3 This is a rear view of the deep-water riser multi-parameter real-time monitoring device of the present invention installed on the deep-water riser.

[0029] Figure 4 This is a schematic diagram of the first clamp structure;

[0030] Figure 5 This is a schematic diagram of the first clamp from another angle;

[0031] Figure 6 This is a schematic diagram of an arc-shaped fixing frame;

[0032] Figure 7 This is a schematic diagram of the first base support;

[0033] Figure 8 This is a schematic diagram of the second base support;

[0034] Figure 9 This is a schematic diagram of the first fixed support;

[0035] Figure 10 This is a schematic diagram of the second fixed bracket;

[0036] Figure 11 This is a schematic diagram of the third fixed bracket;

[0037] Figure 12 This is a schematic diagram of the other side of the third fixed bracket;

[0038] Figure 13 Schematic diagram of a fiber optic junction box;

[0039] Figure 14 This is a schematic diagram of the second clamp;

[0040] Figure 15 A schematic diagram showing the installation location of the fiber optic temperature sensor;

[0041] Figure 16 This is a schematic diagram of a column-shaped fixing frame;

[0042] Figure 17 This is a schematic diagram of a fiber optic strain sensor.

[0043] In the diagram: 1-First clamp, 2-Second clamp, 3-Third clamp, 4-Fourth clamp, 5-Deep water riser, 6-Fiber optic strain sensor, 7-Fiber optic accelerometer, 8-Fiber optic temperature sensor, 9-Fiber optic junction box, 10-Fiber optic channel, 11-First base bracket, 12-Second base bracket, 13-Third base bracket, 14-Fourth base bracket, 15-Fifth base bracket, 16-Fixing groove, 17-Arc-shaped groove, 18-Arc-shaped fixing bracket, 19-Columnar fixing bracket, 20-Columnar fixing bracket cable through hole, 21-First fixing bracket, 22-Second fixing bracket, 23-Third fixing bracket, 24-Fourth fixing bracket, 25-Fifth fixing bracket, 26-Sixth fixing bracket, 27-Seventh fixing bracket, 28-Reserved channel. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] The purpose of this invention is to provide a multi-parameter real-time monitoring device for deep-water risers to solve the problems existing in the prior art. It can achieve the overall integration, efficient fixing and convenient installation of various types of fiber optic sensors. At the same time, it can prevent the attenuation of fiber optic signal transmission and damage to the fiber optic cable caused by the twisting of the fiber optic cable in the complex marine environment, thereby ensuring the monitoring performance of fiber optic sensors in long-term underwater monitoring environments and improving the quality and efficiency of monitoring data.

[0046] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] This invention provides a multi-parameter real-time monitoring device for deep-water risers, with reference to... Figures 1 to 17 As shown, the system includes a sensor fixing device, which includes a clamp that can be fastened to the outer wall of the deep-water riser 5. Fiber optic sensors are mounted on the sensor fixing device, including a fiber optic strain sensor 6, a fiber optic accelerometer 7, and a fiber optic temperature sensor 8. These sensors can monitor the strain, acceleration, and temperature signals at different locations on the deep-water riser 5, respectively, achieving real-time synchronous monitoring of the ambient temperature, structural stress, and vibration state at the same underwater location on the deep-water riser 5. The measured strain value is corrected by the strain coefficient k to obtain the true strain value at the measurement location on the riser. The strain coefficient k is obtained through numerical fitting after verification by multi-condition experimental results and the finite element mathematical model. The fiber optic junction box 9 is installed on the sensor fixing device and connected to the fiber optic sensor via an optical cable. It is used to transmit the collected multi-parameter data in real time to the structural health monitoring system deployed underwater or on the mother ship via the optical cable. The cable anti-twist device includes a mounting bracket fixed on the sensor fixing device, and the mounting bracket has an optical fiber channel 10 for installing the optical cable. The optical cable is fixed in the optical fiber channel 10 formed by compression. Twisting the cable will affect the optical fiber sensing performance. The optical fiber channel 10 of this invention, as a cable anti-twist device, can prevent the device of this invention from dragging and twisting the optical cable to prevent damage and excessive twisting from interfering with the optical fiber signal transmission. It can achieve zero exposure of the optical fiber cable in the marine environment, avoid direct contact with the seawater environment, and reduce damage to the optical fiber cable line caused by seawater erosion, marine organism attachment and other factors.

[0048] In one specific embodiment, the clamps are made of titanium alloy. Titanium alloy has good machinability and better corrosion resistance in deep water, making the clamps more durable and practical. The clamps include a first clamp 1, a second clamp 2, a third clamp 3, and a fourth clamp 4 with a semi-circular ring structure. The third clamp 3 and the fourth clamp 4 are connected by a metal strip. In this embodiment, the first clamp 1 and the second clamp 2 are integrally formed to ensure uniform force distribution when fixing the bolts of the first clamp 1 and the third clamp 3. After aligning the first clamp 1 and the third clamp 3, and the second clamp 2 and the fourth clamp 4 on both sides, high-strength bolts and nuts are used for diagonal fixing, ultimately installing the clamps onto the deep-water riser 5. The installation of the fiber optic sensor, fiber optic junction box 9, and armored optical cable can be completed after the clamps are installed. Once the deep-water riser 5 is completed, during use, simply connect the optical cable interfaces on both sides within the reserved channel 28 of the clamp, and then fix the clamp to the deep-water riser 5 using fixing bolts. The connection between each component can be selected according to different manufacturing materials, using different connection methods and anti-corrosion measures, such as welding, gel fixing, etc. The clamps and other components can be customized according to the size of the riser. The first clamp 1 and the third clamp 3 are symmetrically set at the same height on the upper part of the deep-water riser 5, and after the first clamp 1 and the third clamp 3 are fixedly connected, they hug the outer wall of the deep-water riser 5 to form the upper clamp. The second clamp 2 and the fourth clamp 4 are symmetrically set at the same height on the lower part of the deep-water riser 5, and after the second clamp 2 and the fourth clamp 4 are fixedly connected, they hug the outer wall of the deep-water riser 5 to form the lower clamp. This invention uses high-strength bolts to fix the ear plates at both ends of the first clamp 1 and the third clamp 3, and high-strength bolts to fix the ear plates at both ends of the second clamp 2 and the fourth clamp 4, thus forming a sensor fixing device for fixing and integrating the aforementioned fiber optic sensor. The sensor fixing device is customized according to the dimensions of the deep-water riser 5, enabling accurate transmission and measurement of structural stress and vibration of the deep-water riser 5. For deep-water riser 5 structures of different sizes, only the dimensions of the clamps need to be changed to achieve the corresponding measurements.

[0049] To ensure a more stable connection for the fiber optic sensor, this embodiment incorporates multiple mounting brackets between the upper and lower clamps. These brackets include base brackets, fixed brackets, an arc-shaped fixing frame 18, and a columnar fixing frame 19. Each base bracket is embedded in the outer side of the corresponding clamp's middle portion, leaving a gap between the base bracket and the deep-water riser 5. This ensures that the connection between the sensor and the base bracket does not interfere with the clamp's installation on the deep-water riser 5. The base brackets include a first base bracket 11, a second base bracket 12, and a third base bracket 13, each connected to the bottom of the first clamp 1. A fourth base bracket 14 and a fifth base bracket 15 are connected to the bottom of the third clamp 3. Each of the first and third base brackets 11 and 13 is connected to a fiber optic accelerometer 7, and each of the fourth and fifth base brackets 14 and 15 is connected to a fiber optic stress sensor. The fiber optic accelerometer 7 and strain sensor are mounted at 90° angles on the base brackets, enabling the measurement of the three-dimensional vibration response signal of the deep-water riser 5. The fiber optic junction box 9 is fused to two fiber optic strain sensors 6, two fiber optic accelerometers 7, and one fiber optic temperature sensor 8 via a five-core fiber optic cable. In other embodiments, the fiber optic junction box 9 can also be fused to two fiber optic strain sensors 6, two fiber optic accelerometers 7, and one fiber optic temperature sensor 8 via a one-core fiber optic cable using a fiber optic splitter with a splitting ratio of 1:5. In addition to the above fusion splicing methods, the fiber optic junction box 9 can also be fused to two fiber optic strain sensors 6 via a three-core fiber optic cable using a fiber optic splitter with a splitting ratio of 1:2, another fiber optic cable can be fused to two fiber optic accelerometers 7, and the third fiber optic cable can be fused to the fiber optic temperature sensor 8.

[0050] This device enables simultaneous acquisition of acceleration, temperature, and strain signals at the same location. Furthermore, the sensor mounting components can be modified to accommodate other types of sensors on the first clamp 1 and the third clamp 3, depending on actual needs. The deep-water riser multi-parameter real-time monitoring device of this invention features a compact layout, high adjustability, a reasonable structural design, and convenient operation, making it highly promising for future applications. An optical fiber junction box 9 is connected to the second base bracket 12. One end of the second base bracket 12 is fixed to the first clamp 1, while the other end rests on the second clamp 2 without being fixed, preventing stress concentration on the first clamp 1 caused by simultaneous fixing at both ends, and ensuring that the strain value measured by the optical fiber strain sensor 6 is closer to the true structural value.

[0051] Fixed brackets are fixedly installed on the outside of the corresponding base brackets, including a first fixed bracket 21 fixedly installed on the outside of the first base bracket 11, a second fixed bracket 22 and a fourth fixed bracket 24 fixedly installed on the outside of the second base bracket 12, a third fixed bracket 23 fixedly installed on the outside of the third base bracket 13, a sixth fixed bracket 26 fixedly installed on the outside of the fourth base bracket 14, and a seventh fixed bracket 27 fixedly installed on the outside of the fifth base bracket 15. One end of the first fixed bracket 21, the second fixed bracket 22, and the third fixed bracket 23 is engaged with the corresponding fixing groove 16 on the outside of the first clamp 1. The fourth fixed bracket 24 is engaged with the fixing groove 16 on the outside of the second clamp 2. The sixth fixed bracket 26 and the seventh fixed bracket 27 are respectively engaged with the fixing groove 16 on the outside of the third fixed clamp. A fifth fixed bracket 25 is fixedly connected to the outside of the third fixed bracket 23. The fifth fixed bracket 25 uses two semi-circular connecting grooves, which are fixedly connected by bolts to form a clamping structure. This structure is used to fix and clamp the fiber optic temperature sensor 8, enabling accurate measurement of temperature at different locations, and thus temperature compensation for structural strain data. To make the connection of the fixed bracket more stable, corresponding fixing grooves 16 can be opened at the corresponding positions of the second clamp 2 and the fourth clamp 4, so as to connect with the other end of the corresponding fixed bracket.

[0052] An arc-shaped groove 17 is formed between two adjacent fixing grooves 16 of the first clamp 1 and the third clamp 3. An arc-shaped fixing frame 18 is fixed in each arc-shaped groove 17, and an optical fiber channel 10 is formed inside the arc-shaped fixing frame 18. The end of the optical fiber temperature sensor 8 is provided with a curved columnar fixing bracket. One end of the columnar fixing frame 19 is inserted into the columnar fixing frame cable through hole 20 formed on the third fixing bracket 23. The optical cable connected to the optical fiber temperature sensor 8 passes through the columnar fixing bracket and enters the optical fiber channel 10 formed inside the corresponding arc-shaped fixing frame 18 through the columnar fixing frame cable through hole 20.

[0053] During installation, the optical cable is led out from the cable outlet at the top of the fiber optic junction box 9. One branch of the optical cable passes through the optical fiber channel 10 of the second fixed bracket 22, the optical fiber channel 10 of the corresponding arc-shaped fixed bracket 18, and the optical fiber channel 10 of the first fixed bracket 21, before connecting to the optical fiber accelerometer 7. The second branch of the optical cable passes through the optical fiber channel 10 of the second fixed bracket 22, the optical fiber channel 10 of the corresponding arc-shaped fixed bracket 18, and the optical fiber channel 10 of the third fixed bracket 23, before connecting to another optical fiber accelerometer 7. The third branch of the optical cable passes through the optical fiber channel 10 of the second fixed bracket 22. The fiber optic temperature sensor 8 is connected to the fiber optic temperature channel 10 of the corresponding arc-shaped fixing bracket 18, the cable through hole 20 of the column-shaped fixing bracket 23, and the fiber optic channel 10 of the column-shaped fixing bracket 19. The fourth branch cable of the optical cable is connected to the main cable of the strain sensor in the third clamp 3 after passing through the fiber optic channel 10 of the second fixing bracket 22, the fiber optic channel 10 of the corresponding arc-shaped fixing bracket 18, the fiber optic channel 10 of the third fixing bracket 23, the fiber optic channel 10 of the corresponding arc-shaped fixing bracket 18 on the other side, and the interface of the reserved channel 28 at the bolt fixing point of the ear plate at both ends of the first clamp 1. One branch of the strain sensor main cable passes through the fiber optic channel 10 of the arc-shaped fixing frame 18 of the third clamp 3 and the fiber optic channel 10 of the sixth fixing bracket 26, and then connects to a fiber optic strain sensor 6. The other branch of the strain sensor main cable passes through the fiber optic channel 10 inside the arc-shaped fixing frame 18 of the third clamp 3 and the fiber optic channel 10 of the seventh fixing bracket 27, and then connects to another fiber optic strain sensor 6, thus achieving the purpose of connecting the two fiber optic strain sensor 6 circuit structures into the fiber optic junction box 9. All optical cable lines are laid in the fiber optic channels 10 inside the integrated device to achieve the effect of protection and fixation, so as to prevent twisting during transportation and installation, which would affect the fiber optic signal strength. Therefore, the twisting of the optical cable is restricted through the cable channel to ensure normal signal transmission.

[0054] When multiple devices of the present invention are installed at different positions on the deep water riser 5, two adjacent fiber optic junction boxes 9 can be serially connected through the optical cable in the optical fiber channel 10 of the fourth fixed bracket 24, thereby enabling the detection signals of each device to be transmitted to the external system.

[0055] The present invention fixes the optical cable in the optical fiber channel 10 formed by pressing the upper and lower parts together through the base bracket and the fixed bracket. This can prevent the device from dragging and twisting the optical cable and causing damage, excessive twisting from interfering with the transmission of optical fiber signals, and achieve zero exposure of the optical cable in the marine environment. It avoids direct contact with the seawater environment and reduces damage to the optical fiber cable line caused by seawater erosion, marine organism attachment and other factors.

[0056] Assuming the diameter of the deep-water riser 5 in this embodiment is D, the thickness of both the arc-shaped fixing bracket 18 and the base bracket is 0.02D, and the width is 0.1D; the length of the base bracket is 1.5D. This proportional relationship is the optimal solution for the simultaneous deformation of the clamp and the deep-water riser 5 in this invention. The fiber optic strain sensor 6 is embedded in the groove machined on the corresponding base bracket and then sealed with adhesive to avoid directly sticking it to the surface of the corresponding fixing bracket, which would cause stress concentration and thus reduce measurement errors.

[0057] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A multi-parameter real-time monitoring device for deep-water risers, characterized in that: include: A sensor fixing device includes a clamp that can be fastened to the outer wall of a deep water riser; the clamp includes an upper clamp and a lower clamp connected by a metal strip. The fiber optic sensor, which is mounted on the sensor fixing device, includes a fiber optic strain sensor, a fiber optic acceleration sensor, and a fiber optic temperature sensor, and can monitor the strain, acceleration, and temperature signals at different locations in the deep water riser, respectively. The fiber optic junction box is installed on the sensor fixing device and connected to the fiber optic sensor via an optical cable. It is used to transmit the collected multi-parameter data in real time to the structural health monitoring system deployed underwater or on the mother ship via the optical cable. The cable anti-twist device includes a mounting bracket fixedly mounted on the sensor fixing device, and the mounting bracket has an optical fiber channel for mounting the optical cable; multiple mounting brackets are connected between the upper clamp and the lower clamp; the mounting bracket includes a base bracket, a fixing bracket, and an arc-shaped fixing frame; Two fiber optic strain sensors and two fiber optic accelerometers are each provided; the included angle between the two fiber optic strain sensors along the circumference of the deep-water riser is 90 degrees. o The included angle between the two fiber optic accelerometers along the circumference of the deep-water riser is 90°. o The fiber optic junction box is fused to the fiber optic strain sensor, fiber optic accelerometer, and fiber optic temperature sensor respectively via a five-core fiber optic cable; or, the fiber optic junction box is fused to the fiber optic strain sensor, fiber optic accelerometer, and fiber optic temperature sensor respectively via a one-core fiber optic cable using a fiber optic splitter with a splitting ratio of 1:5; or, the fiber optic junction box is fused to the fiber optic strain sensor, fiber optic accelerometer, and fiber optic temperature sensor respectively via a three-core fiber optic cable using a fiber optic splitter with a splitting ratio of 1:2; the upper clamp includes a first clamp and a third clamp, with fixing grooves on the outer walls of the first clamp and an arc-shaped groove between adjacent fixing grooves; one end of the fixing bracket engages with the corresponding fixing groove; the arc-shaped fixing frame is fixedly installed in the arc-shaped groove; the fiber optic channel is provided on the inner side of the arc-shaped fixing frame; the bolt fixing points of the ear plates at both ends of the first clamp have reserved channels; The fiber optic strain sensor, fiber optic accelerometer, and fiber optic junction box are respectively fixedly connected to their corresponding base brackets; the fiber optic temperature sensor is fixed on the upper part of one of the fiber optic accelerometers; the fixed bracket is fixedly disposed on the outside of the base bracket, and one end of the fixed bracket is connected to the outside of the first clamp or the third clamp; the fiber optic channel is formed between the fixed bracket and the base bracket, and the fiber optic channel forms a cable anti-twist device, which can prevent the device from dragging and twisting and causing damage to the optical cable; The fiber optic temperature sensor is fixedly mounted on a fixed bracket connected to the upper part of one of the fiber optic accelerometers; the end of the fiber optic temperature sensor is provided with a curved columnar fixed bracket, and the optical cable connected to the fiber optic temperature sensor passes through the columnar fixed bracket.

2. The deep-water riser multi-parameter real-time monitoring device according to claim 1, characterized in that: The upper clamp and the lower clamp are respectively fitted onto the outer wall of the deep water riser, and the inner diameter of the upper clamp and the lower clamp can be adjusted; the fiber optic sensor and the fiber optic junction box are disposed between the upper clamp and the lower clamp.

3. The deep-water riser multi-parameter real-time monitoring device according to claim 2, characterized in that: The first and third clamps are symmetrically arranged at the same height on both sides of the deep water riser, and after being fixedly connected, they hug the outer wall of the deep water riser; the lower clamps include a second and a fourth clamp, which are symmetrically arranged at the same height on both sides of the deep water riser, and after being fixedly connected, they hug the outer wall of the deep water riser; the third and fourth clamps are connected by a metal strip.

4. The deep-water riser multi-parameter real-time monitoring device according to claim 1, characterized in that: The diameter of the deep-water riser is D The thickness of both the arc-shaped fixing frame and the base support is 0.02 mm. D The width of each is 0.

1. D The base support is 1.5 meters long. D .

5. The deep-water riser multi-parameter real-time monitoring device according to claim 1, characterized in that: The fiber optic strain sensor is embedded in the groove machined on the corresponding base bracket and then sealed with adhesive.

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