Marine riser dynamic response monitoring equipment in in-service state

Abstract

The invention provides an in-service marine riser dynamic response monitoring device, which comprises a monitoring device fixing module, a sensing system module and a synchronous acquisition module, and is characterized in that the monitoring device fixing module is rigidly connected to different positions of a to-be-detected riser; the sensing system module comprises a GPS base station, a GPS position indicator, an inclinometer and a fiber bragg grating strain gauge, and the GPS position indicator, the inclinometer and the fiber bragg grating strain gauge are all rigidly connected with the monitoring equipment fixing module; the synchronous acquisition module is mounted on the top platform, is connected with the GPS base station, the inclinometer and the fiber bragg grating strain gauge, and is used for receiving, recording and storing a GPS motion signal, a fiber bragg grating strain gauge signal and an inclinometer signal. The device is simple in structure, the sensing system module is installed at different positions of the riser through the monitoring equipment fixing module, installation and use are easy, the submarine riser does not need to be polished during installation, the device is small in size and light in weight, and the influence on the strength and vibration characteristics of the marine riser after installation is completed is small.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering technology, and in particular to a dynamic response monitoring device for an in-service marine riser. Background Art

[0002] Marine risers are key equipment that connects subsea oil and gas wells to offshore platforms. They are used to transport oil and gas, inject fluids, and control downhole equipment. In actual operation, marine risers are subject to multiple environmental factors such as ocean currents and top platforms. Under the influence of such complex and multiple environments, marine risers face the risk of structural strength damage and fatigue damage. Marine risers are the weakest link in the entire oil and gas development system. Once damaged, they will cause great environmental disasters and casualties. Therefore, real-time monitoring of the dynamic response of marine risers is of great significance to ensuring the safety of risers and offshore oil and gas development.

[0003] At present, the academic and engineering circles at home and abroad have very limited knowledge of dynamic response monitoring technology for actual marine risers in service working conditions. A patent in 2021 (ZL202110895197.X) provides a wireless remote-controlled multi-point mechanical synchronous monitoring method for deep-water drilling risers. This method uses multi-point acoustic wireless measurement and communication technology to achieve synchronous measurement of multi-point motion. A patent in 2023 (CN202311718320.6) proposed a real-time joint monitoring system for risers using distributed optical fiber and ultra-short baselines. The optical fiber is attached to the surface of the riser, and the limited-node ultra-short baseline uses acoustic communication to realize the position and posture information of key nodes. In addition, in the traditional wired testing method of resistance strain gauges, the strain gauges are polished and pasted to realize the testing of the surface strain of the structure. The above response monitoring method has the following technical limitations: (1) Acoustic communication measurement cannot achieve long-distance transmission and is difficult to apply to ultra-deepwater risers (water depth greater than 3000m); (2) Acoustic communication has poor anti-interference and anti-noise capabilities, and the signal is easily contaminated; (3) Traditional resistance strain gauge and optical fiber strain gauge testing methods are difficult to implement, and there is no condition for grinding and pasting strain gauges on the riser surface, making installation difficult; (4) The resistance strain test method is difficult to make watertight, the wired transmission distance is short, and the anti-electromagnetic interference capability is poor; (5) Seawater is highly corrosive, the response monitoring equipment lacks protection, and it is difficult to operate and maintain for a long time. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a dynamic response monitoring device for marine risers in service.

[0005] The in-service marine riser dynamic response monitoring equipment provided by the present invention comprises a monitoring equipment fixing module, a sensor system module and a synchronous acquisition module, wherein the monitoring equipment fixing module is rigidly connected to different positions of the riser to be tested;

[0006] The sensing system module includes a GPS locator, an inclinometer and a fiber Bragg grating strain gauge. The GPS locator is fixed on the top platform. The inclinometer and the fiber Bragg grating strain gauge are rigidly connected to the monitoring equipment fixing module.

[0007] The synchronous acquisition module is installed on the top platform and connected with the GPS locator, the inclinometer and the fiber grating strain gauge signal, and is used for synchronously receiving and recording and storing the GPS motion signal, the fiber grating strain gauge signal and the inclinometer signal.

[0008] Preferably, there are multiple monitoring equipment fixing modules, and the multiple monitoring equipment fixing modules are respectively fixedly installed at different positions of the standpipe to be tested;

[0009] An inclinometer and a fiber Bragg grating strain gauge are installed on each fixed module of monitoring equipment. The inclinometers and fiber Bragg grating strain gauges on the fixed modules of different monitoring equipment are connected in series in sequence through optical fiber transmission lines, and are connected to the synchronous acquisition module through optical fiber transmission lines;

[0010] The inclinometer is used to measure the torsion angle of the riser to be tested at the corresponding position, the fiber grating strain gauge is used to measure the strain signal of the riser to be tested at the corresponding position, and the GPS locator is used as a coordinate origin to provide a reference for measuring the dynamic response of the riser to be tested.

[0011] Preferably, the monitoring equipment fixing module comprises an upper clamp and a lower clamp, and the upper clamp and the lower clamp each comprise two semicircular hoops arranged opposite to each other;

[0012] The inner circles of the two semicircular hoops are combined to form a circular installation position, the standpipe to be tested is located in the circular installation position, and the two semicircular hoops are fixedly connected to the standpipe to be tested by first fixing bolts at the ends;

[0013] The fiber grating strain gauge is installed between the semicircular hoop of the upper fixture and the semicircular hoop of the lower fixture, and the inclinometer is fixedly installed on the top of the semicircular hoop of the upper fixture.

[0014] Preferably, the monitoring equipment fixing module further comprises an elastic base, and the semicircular hoop of the upper clamp and the semicircular hoop of the lower clamp are both provided with mounting holes corresponding to the positions;

[0015] The top and bottom of the elastic body base are respectively mounted in the mounting hole at the bottom of the upper clamp and the mounting hole at the top of the lower clamp by means of second fixing bolts;

[0016] The fiber grating strain gauge is installed on an elastic base, and the length direction of the fiber grating strain gauge is parallel to the axis of the standpipe to be measured.

[0017] Preferably, a plurality of elastic bases are arranged between the upper clamp and the lower clamp, and the plurality of elastic bases are arranged circumferentially outside the standpipe to be tested;

[0018] The fiber grating strain gauge is pasted on each of the elastic body bases.

[0019] Preferably, the monitoring equipment fixing module further comprises a strain gauge protection device, and the marine riser dynamic response monitoring equipment further comprises a ready-to-assemble state;

[0020] The strain gauge protection device comprises a strain gauge protection block, a positioning block and a positioning bolt. The cross section of the strain gauge protection block is an I-shaped, and the positioning block is installed on the protrusion on the side of the I-shaped by the positioning bolt.

[0021] When in the state to be assembled, the upper clamp and the lower clamp are both arranged between the two raised portions on the side of the I-shape, the top of the upper clamp overlaps with the bottom of the raised portion at the top of the I-shape, and the bottom of the lower clamp overlaps with the top of the raised portion at the bottom of the I-shape, and a clamping position is formed between the positioning block and the raised portion of the I-shape, which is used to clamp the upper clamp or the lower clamp.

[0022] Preferably, it further comprises an equipment protection module, which comprises a zinc block fixedly mounted on the monitoring equipment fixing module.

[0023] Preferably, the synchronous acquisition module includes a demodulator and a host computer, and the number of the fiber grating strain gauges is four, and the four fiber grating strain gauges are arranged circumferentially on the outside of the riser to be measured;

[0024] On the fixed modules of different monitoring equipment, the fiber grating strain gauge, inclinometer and GPS locator on the same side are connected in series through optical fiber transmission lines. The optical fiber transmission lines transmit the strain signal, inclinometer signal and GPS locator signal to the demodulator in real time for demodulation, convert them into data signals and store them synchronously by the host computer.

[0025] Preferably, the GPS locator on the top platform is used as the coordinate origin O, the water depth is used as the Z axis, the bow direction of the calm water platform is used as the X axis, and the direction perpendicular to the bow is used as the Y axis to construct a coordinate system.

[0026] Preferably, fiber Bragg grating strain gauges are arranged at four quadrants of the cross section at each different position of the riser to be measured, and the host computer of the synchronous acquisition module is embedded with a strain solution algorithm, and the strain solution algorithm includes:

[0027] The strains measured by each fiber Bragg grating strain gauge located on the same section are expressed as: a1 ,ε a2 ,ε b1 ,ε b2 , where εa1 ,ε a2 On the opposite side of the cross section along the X direction, ε b1 ,ε b2 On the opposite side of the cross section along the Y direction, the strain response measured by each fiber Bragg grating strain gauge is expressed as:

[0028] ε a1 =ε b-a +ε Ta +ε a01 ,

[0029] ε a2 =-ε b-a +ε Ta +ε a02 ,

[0030] ε b1 =ε b-b +ε Tb +ε b01 ,

[0031] ε b2 =-ε b-b +ε Tb +ε b02 ,

[0032] In the formula, ε b-a ,ε b-b Represent the bending strains in two perpendicular directions at the cross section, ε Ta ,ε Tb Respectively represent the tensile strains in two perpendicular directions at the cross section; ε a01 ,ε a02 ,ε b01 ,ε b02 Represent the initial strain values ​​of four fiber Bragg grating strain gauges respectively;

[0033] The distance between the grating strain gauge and the center of the cross section of the riser to be measured is R, the radius of the riser to be measured is r, the angular response between the grating strain gauge and the X-axis of the global coordinate system is θ, and the dynamic bending strain ε of the riser to be measured in the X and Y directions at each cross-sectional position is x ,ε y Expressed as:

[0034]

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention has a simple structure and is easy to operate. The sensor system module is installed at different positions of the riser through the monitoring equipment fixing module. It is easy to install and use. There is no need to grind the submarine riser during installation. The equipment is small in size and light in weight. After installation, it has little effect on the hydrodynamic characteristics of the marine riser, especially the strength and vibration characteristics of the marine riser.

[0037] 2. The present invention uses optical fiber as the transmission line, with low signal loss, which overcomes the shortcoming that acoustic communication measurement cannot be transmitted over long distances, and is suitable for monitoring and measuring riser strain under deep and ultra-deep water conditions.

[0038] 3. The present invention uses fiber Bragg grating strain gauges to measure strain signals. Compared with traditional resistance strain gauges, fiber Bragg grating strain gauges transmit through optical signals, are not affected by electromagnetic interference, and do not require power. In addition, fiber Bragg grating strain gauges can be connected in series through optical fibers to achieve multi-point measurement and large-scale detection. Fiber Bragg grating strain gauges have good corrosion resistance, small size, and higher sensitivity.

[0039] 4. The present invention has good waterproof performance and is suitable for long-term underwater measurement. It protects equipment through the sacrificial anode method and meets the needs of long-term work.

[0040] 5. The device of the present invention uses a GPS locator, an inclinometer and a fiber grating strain gauge in combination to more accurately describe the dynamic response of the riser. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0042] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0043] Figure 2 It is a schematic diagram of the assembly of a single monitoring device module and a marine riser in the present invention;

[0044] Figure 3 It is a schematic diagram of the structure of the upper clamp or the lower clamp in the present invention;

[0045] Figure 4 It is a structural schematic diagram of the strain gauge protection module in the present invention;

[0046] Figure 5 It is a module schematic diagram of the synchronous acquisition system in the present invention;

[0047] Figure 6 This is a general schematic diagram of the joint operation of each module after installation in the present invention;

[0048] Figure 7It is a schematic diagram of obtaining the strain response at each cross-sectional position under a unified coordinate system of the present invention.

[0049] The figure shows:

[0050] Upper fixture 1 Mounting hole 12

[0051] Lower fixture 2 waist hole 13

[0052] First fixing bolt 3 fixing hole 14

[0053] Strain gauge protection device 4 GPS locator 20

[0054] Elastomer base 5 Synchronous acquisition module 21

[0055] Riser to be tested 6 Demodulator 22

[0056] Inclinometer 7 Host computer 23

[0057] Second fixing bolt 8 Strain gauge protection block 41

[0058] Optical fiber transmission line 9 Positioning block 42

[0059] Fiber Bragg Grating Strain Gauge 10 Positioning Bolt 43

[0060] Semicircular hoop 11 DETAILED DESCRIPTION

[0061] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0062] The present invention discloses an in-service marine riser dynamic response monitoring device, which comprises a monitoring device fixing module, a sensor system module, a synchronous acquisition module and an equipment protection module. The sensor system module is installed at different positions of the riser through the monitoring device fixing module. The device is easy to install and use, and there is no need to grind the seabed riser during installation. The device is small in size and light in weight, and has little influence on the hydrodynamic characteristics of the marine riser after installation.

[0063] The in-service marine riser dynamic response monitoring equipment provided by the present invention comprises a monitoring equipment fixing module, a sensor system module and a synchronous acquisition module 21, wherein the monitoring equipment fixing module is rigidly connected to different positions of the riser 6 to be tested; the sensor system module comprises a GPS locator 20, an inclinometer 7 and a fiber Bragg grating strain gauge 10, the GPS locator 20 is fixed on the top platform, and the inclinometer 7 and the fiber Bragg grating strain gauge 10 are rigidly connected to the monitoring equipment fixing module; the synchronous acquisition module 21 is installed on the top platform and is signal-connected to the GPS locator 20, the inclinometer 7 and the fiber Bragg grating strain gauge 10, and is used for synchronously receiving and recording and storing GPS motion signals, fiber Bragg grating strain gauge signals and inclinometer signals.

[0064] Furthermore, the in-service marine riser dynamic response monitoring equipment can be fixed to any position of the marine riser through a monitoring equipment fixing module. The monitoring equipment fixing module includes an upper clamp 1, a lower clamp 2, a strain gauge protection device 4, and a nut.

[0065] Furthermore, the upper clamp 1 and the lower clamp 2 are respectively composed of two semicircular hoops, and the two semicircular hoops 11 are clamped and fixed on the standpipe 6 to be tested by the first fixing bolts 3. The upper clamp 1 and the lower clamp 2 are both of uniform thickness, and have rounded corners on both the inner and outer surfaces. Through holes penetrating the upper and lower surfaces are opened thereon, serving as mounting holes 12 for mounting and fixing the elastic body base; a plurality of waist holes 13 and threaded holes penetrating the inner and outer surfaces are opened between the upper and lower surfaces of the clamp.

[0066] Furthermore, the strain gauge protection block 41 is an I-shaped structure in cross section, and can be used with the positioning block 42 and the positioning bolt 43 to determine the spacing between the upper and lower clamps, ensuring that the fiber Bragg grating strain gauge 10 does not deform before use. When in use, the upper and lower surfaces of the strain gauge protection block 41 are in close contact with the upper surface of the upper clamp 1 and the lower surface of the lower clamp 2, respectively. After the monitoring device is installed, the strain gauge protection device 4 should be removed, and the monitoring device can work.

[0067] Furthermore, the elastomeric base 5 is a columnar structure which is slightly thicker at both ends and slightly narrower in the middle. Both ends of the elastomeric base 5 should be inserted into the mounting holes 12 of the upper and lower clamps, and fixed by the fixing holes 14 at the waist of the clamp and the second fixing bolts 8. There are 4 groups of elastomeric bases 5 in each set of equipment, which are respectively installed at the 0°, 90°, 180° and 270° positions of the circular cross-section of the riser.

[0068] Furthermore, the fiber grating strain gauge 10 is pasted on the elastomer base 5. The bending stiffness of the elastomer is much smaller than that of the riser. The fiber grating strain gauges 10 at the same position of different equipment are connected in series through the optical fiber transmission line 9. The inclinometer 7 is fixed to the fixture by bolts and connected to the demodulator 22 on the platform through the transmission line to measure the torsion angle of the riser at this position and correct the strain signal. The GPS locator 20 is fixed on the top platform as the coordinate origin O, and the global coordinate system is constructed with the water depth as the Z axis, the bow direction of the calm water platform as the X axis, and the vertical bow direction as the Y axis. The strain response measured by the elastomer can be transformed to obtain the strain response of the marine riser at the interface position. The elastic body is arranged at the four quadrants of the cross section and the fiber grating strain gauge 10 is pasted. The measured strains are expressed as: ε a1 ,ε a2 ,ε b1 ,ε b2 Among them, ε a1 ,ε a2 On the opposite side of the cross section along the X direction, ε b1 ,ε b2 On the opposite side of the cross section along the Y direction. The strain response measured by each strain gauge can be expressed as:

[0069] ε a1 =ε b-a +ε Ta +ε a01 ,

[0070] ε a2 =-ε b-a +ε Ta +ε a02 ,

[0071] ε b1 =ε b-b +ε Tb +ε b01 ,

[0072] ε b2 =-ε b-b +ε Tb +ε b02 ,

[0073] In the formula, ε b-a ,ε b-b Respectively represent the bending strains in two perpendicular directions at the cross section; ε Ta ,ε Tb Respectively represent the tensile strains in two perpendicular directions at the cross section; ε a01 ,ε a02 ,ε b01 ,ε b02 They represent the initial strain values ​​of the four fiber Bragg grating strain gauges 10 respectively.

[0074] Furthermore, the optical fiber connects in series the fiber grating strain gauge 10, the inclinometer 7 and the GPS locator 20 on the same side. The optical fiber transmits the strain signal, the inclinometer signal and the GPS locator signal to the demodulator 22 for demodulation in real time, converts them into data signals and is synchronously stored by the host computer 23, thereby realizing real-time monitoring of the dynamic response of the marine riser.

[0075] Furthermore, the host computer 23 is embedded with a strain calculation algorithm. As mentioned above, the strains measured by the fiber grating strain gauge 10 at the four quadrants are respectively expressed as ε a1 ,ε a2 ,ε b1 ,ε b2 The distance between the center of the riser section and the elastic body surface is R, and the radius of the riser is r. Due to the installation of the fixed module of the monitoring equipment at each section and the real-time twisting of the actual marine riser, the rotation angle response between the actual position of the strain gauge and the X-axis of the global coordinate system is θ. From the above, the dynamic bending strain ε of the riser in the X and Y directions at each section position in the unified global coordinate system is x ,ε y It can be expressed as:

[0076]

[0077] Among them, the bending strains ε in two perpendicular directions at the cross section are b-a ,ε b-b It can be expressed as

[0078]

[0079] This achieves the conversion between the strain measured by the strain gauge and the riser bending strain.

[0080] Furthermore, the equipment protection module is an active metal block, which is fixed on the fixing module and achieves the function of preventing equipment from rusting through the sacrificial anode method, thereby meeting the demand for long-term work.

[0081] This example is further described below in conjunction with the accompanying drawings.

[0082] like Figure 1 As shown, this embodiment includes an upper fixture 1, a lower fixture 2, a first fixing bolt 3, a strain gauge protection device 4, an elastic base 5 and a fiber grating strain gauge 10. The upper and lower fixtures serve as the main body of the device, supporting the entire device, and fixing the device on the standpipe to be tested through the cooperation of the first fixing bolt 3.

[0083] like Figure 2As shown, when the device is installed on the riser 6 to be tested, the strain gauge protection device 4 should be removed and the strain gauge should be installed through the strain gauge fixing bolts, and the inclinometer 7 is installed on the upper fixture 1 to measure the inclination of the riser at the location of the device.

[0084] like Figure 3 As shown, the upper and lower clamps are composed of two semicircular hoops 11, which are provided with mounting holes 12, waist holes 13 and fixing holes 14. The mounting holes 12 are used to mount the elastic body base 5, and are fixed through the fixing holes 14.

[0085] like Figure 4 As shown, the strain gauge protection device 4 is composed of a strain gauge protection block 41, a positioning block 42 and a positioning bolt 43. The strain gauge protection block 41 is an I-shaped structure in cross section. When in use, the upper and lower surfaces of the strain gauge protection block 41 are closely attached to the upper surface of the upper fixture 1 and the lower surface of the lower fixture 2 by adjusting the positioning bolt 43, ensuring that the height between the upper and lower fixtures is greater than or equal to the elastic base 5, so as to prevent the fiber Bragg grating strain gauge 10 attached to the elastic base 5 from being deformed before use.

[0086] like Figure 5 As shown, the synchronous acquisition module includes an optical fiber transmission line 9, a demodulator 22 and a host computer 23. The demodulator 22 demodulates the signals from the fiber grating strain gauge 10, the inclinometer 7 and the GPS, and uploads them to the host computer 23. The host computer 23 is embedded with a strain calculation algorithm to convert the strain measured by the strain gauge into the bending strain of the marine riser, thereby realizing real-time acquisition and monitoring of the marine riser.

[0087] like Figure 6 As shown, the in-service marine riser dynamic response monitoring equipment can be fixed at any position of the marine riser 6 to be tested by the monitoring equipment fixing module. The strain gauge 10, the inclinometer and the GPS signal are transmitted to the synchronous acquisition module 21 through the transmission line 9.

[0088] like Figure 7 As shown, the GPS locator 20 is fixed on the top platform as the coordinate origin O, with the water depth as the Z axis, the bow direction of the calm water platform as the X axis, and the direction perpendicular to the bow as the Y axis, to construct a global coordinate system. Elastic bodies are arranged at the four quadrants of the cross section and fiber Bragg grating strain gauges 10 are attached. The measured strains are expressed as: ε a1 ,ε a2 ,ε b1 ,ε b2 Among them, ε a1 ,ε a2 On the opposite side of the cross section along the X direction, ε b1 ,ε b2On the opposite side of the cross section along the Y direction. The strain response measured by each strain gauge can be expressed as:

[0089] ε a1 =ε b-a +ε Ta +ε a01 ,

[0090] ε a2 =-ε b-a +ε Ta +ε a02 ,

[0091] ε b1 =ε b-b +ε Tb +ε b01 ,

[0092] ε b2 =-ε b-b +ε Tb +ε b02 ,

[0093] In the formula, ε b-a ,ε b-b Respectively represent the bending strains in two perpendicular directions at the cross section; ε Ta ,ε Tb Respectively represent the tensile strains in two perpendicular directions at the cross section; ε a01 ,ε a02 ,ε b01 ,ε b02 Represent the initial strain values ​​of the four fiber grating strain gauges respectively. The host computer 23 is embedded with a strain calculation algorithm to convert the strain measured by the strain gauge into the bending strain of the riser. The surface of the elastomer 5 has a cross-section center distance of R with the riser 6, and the radius of the riser is r. Due to the installation of the fixed module of the monitoring equipment at each section and the real-time twisting of the actual marine riser, the rotation angle response between the actual position of the strain gauge and the X-axis of the global coordinate system is θ. From the above, the dynamic bending strain ε of the riser in the X and Y directions at each cross-section position in the unified global coordinate system is x ,ε y It can be expressed as:

[0094]

[0095] Among them, the bending strains ε in two perpendicular directions at the cross section are b-a ,ε b-b It can be expressed as

[0096]

[0097] The production and installation process of this example is as follows:

[0098] Before use, select the upper and lower clamps with appropriate inner diameters according to the diameter of the riser 6 to be tested, the specific use environment, and economic efficiency, and determine the number and layout of the equipment. Prepare enough sensors and transmission lines of appropriate length according to the equipment layout plan. After the device is prepared, the detailed installation steps are as follows:

[0099] Before installing the equipment, the strain gauge positioning bolts 43 should be adjusted to make the upper and lower surfaces of the strain gauge protection block 41 close to the upper surface of the upper clamp 1 and the lower surface of the lower clamp 2 respectively, and ensure that the distance between the upper and lower clamps is greater than the length of the elastic base 5 to prevent the strain gauge on the elastic base 5 from deforming before use. During installation, it should be inserted into the mounting holes 12 in the upper and lower clamps and fixed with bolts.

[0100] When installing the equipment on the riser, first remove the marine organisms or soil attached to the surface of the riser to ensure that there are no foreign objects in the installation area. Then open the first fixing bolt 3 between the two circular hoops of the upper and lower clamps, insert the device into the installation position of the riser to be tested and ensure that the two semi-circular hoops 11 are aligned. After completion, screw the fixing nut into the fixing nut bolts of the upper and lower clamps to fix the equipment. Then unscrew the positioning bolt 43 of the strain gauge protection device 4, remove the strain gauge protection block and the positioning block 42, and install the inclinometer 7 and the active metal block at the appropriate positions of the upper and lower clamps. After the installation is completed, Figure 2 shown.

[0101] After all equipment is installed, the transmission line is arranged. The transmission line is an optical fiber inside and wrapped with a heat shrink tube outside. One end of the optical fiber is connected to the synchronous acquisition module 21, and the other end connects the fiber grating strain gauges 10 at the same position in series and connects the inclinometers 7 on each equipment. Figure 6 As shown, after the connection and testing are completed, the strain gauge and optical fiber are sealed to prevent seawater or corrosive substances from entering. This can achieve real-time acquisition and monitoring of the dynamic response of the marine riser.

[0102] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0103] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An in-service marine riser dynamic response monitoring device, characterized in that: It comprises a monitoring equipment fixing module, a sensor system module and a synchronous acquisition module (21), wherein the monitoring equipment fixing module is rigidly connected to different positions of the standpipe (6) to be tested; The sensing system module comprises a GPS locator (20), an inclinometer (7) and a fiber Bragg grating strain gauge (10), wherein the GPS locator (20) is fixed on the top platform, and the inclinometer (7) and the fiber Bragg grating strain gauge (10) are both rigidly connected to the monitoring equipment fixing module; The synchronous acquisition module (21) is installed on the top platform and is connected to the GPS locator (20), the inclinometer (7) and the fiber optic Bragg grating strain gauge (10) signals, and is used for synchronously receiving and recording and storing the GPS motion signal, the fiber optic Bragg grating strain gauge signal and the inclinometer signal.

2. The in-service marine riser dynamic response monitoring equipment according to claim 1, characterized in that: There are a plurality of monitoring equipment fixing modules, and the plurality of monitoring equipment fixing modules are respectively fixedly installed at different positions of the standpipe (6) to be tested; An inclinometer (7) and a fiber Bragg grating strain gauge (10) are installed on each monitoring equipment fixed module, and the inclinometers (7) and fiber Bragg grating strain gauges (10) on different monitoring equipment fixed modules are sequentially connected in series through optical fiber transmission lines (9), and are connected to a synchronous acquisition module (21) through the optical fiber transmission lines (9); The inclinometer (7) is used to measure the torsion angle of the riser (6) to be measured at the corresponding position, the fiber optic Bragg grating strain gauge (10) is used to measure the strain signal of the riser (6) to be measured at the corresponding position, and the GPS locator is used as a coordinate origin to provide a reference for measuring the dynamic response of the riser (6) to be measured.

3. The in-service marine riser dynamic response monitoring equipment according to claim 1, characterized in that: The monitoring equipment fixing module comprises an upper clamp (1) and a lower clamp (2), and the upper clamp (1) and the lower clamp (2) each comprise two semicircular hoops (11) arranged opposite to each other; The inner circles of the two semicircular hoops (11) are combined to form a circular installation position, the standpipe (6) to be tested is located in the circular installation position, and the two semicircular hoops (11) are fixedly connected to the standpipe (6) to be tested via first fixing bolts (3) at the ends; The fiber grating strain gauge (10) is installed between a semicircular hoop (11) of the upper fixture (1) and a semicircular hoop (11) of the lower fixture (2), and the inclinometer (7) is fixedly installed on the top of the semicircular hoop (11) of the upper fixture (1).

4. The in-service marine riser dynamic response monitoring equipment according to claim 3 is characterized in that: The monitoring equipment fixing module also includes an elastic base (5), and the semicircular hoop (11) of the upper clamp (1) and the semicircular hoop (11) of the lower clamp (2) are both provided with mounting holes (12) at corresponding positions; The top and bottom of the elastic body base (5) are respectively mounted in the mounting hole (12) at the bottom of the upper clamp (1) and the mounting hole (12) at the top of the lower clamp (2) through a second fixing bolt (8); The fiber grating strain gauge (10) is mounted on an elastic base (5), and the length direction of the fiber grating strain gauge (10) is parallel to the axis of the standpipe (6) to be measured.

5. The in-service marine riser dynamic response monitoring equipment according to claim 4, characterized in that: A plurality of elastic bases (5) are arranged between the upper clamp (1) and the lower clamp (2), and the plurality of elastic bases (5) are arranged circumferentially outside the standpipe (6) to be tested; The fiber grating strain gauge (10) is adhered to each of the elastic bases (5).

6. The in-service marine riser dynamic response monitoring equipment according to claim 3, characterized in that: The monitoring equipment fixing module further comprises a strain gauge protection device (4), and the marine riser dynamic response monitoring equipment further comprises a ready-to-assemble state; The strain gauge protection device (4) comprises a strain gauge protection block (41), a positioning block (42) and a positioning bolt (43); the cross section of the strain gauge protection block (41) is an I-shaped cross section; the positioning block (42) is mounted on a raised portion on a side of the I-shaped cross section via the positioning bolt (43); When in the state to be assembled, the upper clamp (1) and the lower clamp (2) are both arranged between the two raised portions on the side of the I-shaped portion, the top of the upper clamp (1) overlaps with the bottom of the raised portion at the top of the I-shaped portion, and the bottom of the lower clamp (2) overlaps with the top of the raised portion at the bottom of the I-shaped portion, and a clamping position is formed between the positioning block (42) and the raised portion of the I-shaped portion for clamping the upper clamp (1) or the lower clamp (2).

7. The in-service marine riser dynamic response monitoring equipment according to claim 1, characterized in that: It also includes an equipment protection module, which includes a zinc block fixedly installed on the monitoring equipment fixing module.

8. The in-service marine riser dynamic response monitoring equipment according to claim 2, characterized in that: The synchronous acquisition module (21) comprises a demodulator (22) and a host computer (23); the number of the optical fiber Bragg grating strain gauges (10) is four, and the four optical fiber Bragg grating strain gauges (10) are arranged circumferentially on the outside of the standpipe (6) to be measured; On different monitoring equipment fixed modules, the fiber optic Bragg grating strain gauge (10), the inclinometer (7) and the GPS locator on the same side are connected in series via an optical fiber transmission line (9). The optical fiber transmission line (9) transmits the strain signal, the inclinometer signal and the GPS locator signal to a demodulator (22) for demodulation in real time, converts them into data signals and is synchronously stored by a host computer (23).

9. The in-service marine riser dynamic response monitoring equipment according to any one of claims 1 to 8, characterized in that: The GPS locator (20) on the top platform is used as the coordinate origin O, the water depth is used as the Z axis, the bow direction of the calm water platform is used as the X axis, and the direction perpendicular to the bow is used as the Y axis to construct a coordinate system.

10. The in-service marine riser dynamic response monitoring equipment according to claim 9, characterized in that: Fiber Bragg grating strain gauges (10) are arranged at four quadrants of the cross section at each different position of the standpipe (6) to be measured, and a host computer (23) of the synchronous acquisition module (21) is embedded with a strain resolution algorithm, and the strain resolution algorithm includes: The strains measured by the fiber grating strain gauges (10) located at the same cross section are respectively expressed as: ε a1 ,ε a2 ,ε b1 ,ε b2 , where ε a1 ,ε a2 On the opposite side of the cross section along the X direction, ε b1 ,ε b2 In the opposite side direction of the cross section along the Y direction, the strain response measured by each fiber grating strain gauge (10) is expressed as: e a1 =e b-a +e Ta +e a01 , e a2 =-e b-a +e Ta +e a02 , e b1 =e b-b +e Tb +e b01 , e b2 =-e b-b +e Tb +e b02 , In the formula, ε b-a ,ε b-b Represent the bending strains in two perpendicular directions at the cross section, ε Ta ,ε Tb Respectively represent the tensile strains in two perpendicular directions at the cross section; ε a01 ,ε a02 ,ε b01 ,ε b02 Respectively represent the initial strain values ​​of four fiber Bragg grating strain gauges (10); The distance between the grating strain gauge (10) and the center of the cross section of the test riser (6) is R, the radius of the test riser (6) is r, the rotation angle response between the grating strain gauge (10) and the X axis of the global coordinate system is θ, and the dynamic bending strain ε of the test riser (6) in the X direction and the Y direction at each cross section position is x ,ε y Expressed as:

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