Underwater riser stress detection device

Abstract

The utility model provides an underwater riser stress detection device, the detection device comprises a jacket and a plurality of optical fiber sensing probes, the jacket is fixedly arranged underwater, the jacket is used for fixing the position of a riser, the plurality of optical fiber sensing probes are sequentially distributed along the length direction of the riser, and the optical fiber sensing probes are used for detecting the stress of the riser. The optical fiber sensing probe can detect the stress of the vertical pipe in real time. The vertical pipe stress detection device has the advantages that the vertical pipe is fixed through the guide pipe frame, then the vertical pipe is detected through the optical fiber sensing probe, and real-time detection of the stress of the vertical pipe can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering equipment detection, in particular to an underwater riser stress detection device. Background Art

[0002] In underwater facilities such as offshore oil and gas extraction, transportation, and offshore wind power, underwater risers play a vital role. Due to the complex and changeable underwater environment, the impact of natural conditions such as currents, waves, tides, and earthquakes on the risers may cause structural fatigue or even damage. Therefore, real-time monitoring of the stress state of the risers and timely warning of potential risks are of great significance to ensure operational safety and reduce economic losses.

[0003] The existing riser monitoring technology mostly relies on regular inspections or the use of corresponding sensors to collect data. These methods usually have problems such as high installation and maintenance costs, poor data transmission reliability, and inability to achieve full-time and all-weather monitoring.

[0004] Therefore, it is necessary to study an underwater riser stress detection device to solve the above problems or alleviate the impact of the above problems. Utility Model Content

[0005] The utility model provides an underwater riser stress detection device, which fixes the riser through a conductor frame and then uses an optical fiber sensor probe to detect the riser, thereby realizing real-time detection of the riser stress, so as to effectively solve the above problems or alleviate the impact of the above problems.

[0006] The underwater riser stress detection device of the utility model may include a conductor frame and a plurality of optical fiber sensor probes. The conductor frame is fixedly arranged underwater and is used to fix the position of the riser. The plurality of optical fiber sensor probes are distributed in sequence along the length direction of the riser. The optical fiber sensor probes can detect the stress of the riser in real time.

[0007] In one embodiment, the conductor frame includes a fixed pile pipe, which is laid along the length direction of the riser, and one end of the pile pipe is fixedly connected to the above-water platform, and the other end is fixed to the bottom of the water.

[0008] In one embodiment, the jacket further includes a lateral support, which is located at one side of the pile pipe, and one end of the lateral support is fixedly connected to a support column of the above-water platform, and the other end of the lateral support is fixed to the pile pipe.

[0009] In one embodiment, the pile pipe is detachably connected to the riser via a guide card, the guide card is fixedly disposed on a side of the riser facing the pile pipe, and the guide card matches the structure of the pile pipe and can be fixed on the pile pipe.

[0010] In one embodiment, the detection device comprises at least three optical fiber sensing probes installed in the connecting elbow section between the vertical pipe and the horizontal pipe.

[0011] In one embodiment, two measurement channels are encapsulated in the optical fiber sensing probe, and the two measurement channels are constructed into a two-dimensional optical fiber Bragg grating sensing detection layout.

[0012] In one embodiment, each of the measurement channels includes two fiber grating sensors and a temperature compensation sensor connected in series via an optical fiber.

[0013] In one embodiment, the fiber grating sensor is a point sensor, a long gauge length sensor or an area distributed sensor.

[0014] In one embodiment, the detection device further comprises a protective layer for protecting the optical fiber sensing probe, the optical fiber sensing probe forms a scanning surface surrounding the riser, and the protective layer covers the scanning surface.

[0015] In one embodiment, the detection device further includes a demodulation system and a data processing center. The demodulation system is connected to the optical fiber sensing probe via a transmission optical fiber, and the data processing center is connected to the demodulation system via a data transmission network cable.

[0016] The underwater riser stress detection device provided by the utility model has at least the following beneficial effects compared with the prior art:

[0017] The underwater riser stress detection device of the utility model fixes the riser through the conductor frame, and then uses the optical fiber sensor probe to detect the riser, which can realize real-time detection of the riser stress. In this way, the underwater riser stress detection device can realize real-time and continuous monitoring of the riser stress state, effectively improve the safety and reliability of the riser structure, and reduce the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of an underwater riser stress detection device according to an embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of a structure in which a protective layer of an embodiment of the utility model is laid on a scanning surface;

[0021] Figure 3 It is a flow chart of signal and data transmission in an embodiment of the utility model.

[0022] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale.

[0023] Reference numerals:

[0024] 1-catheter frame, 2-fiber optic sensor probe, 3-riser, 4-pile pipe, 5-lateral support, 6-guide card, 7-scanning surface, 8-protective layer. DETAILED DESCRIPTION

[0025] The utility model will be further described below in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown, the underwater riser stress detection device of the utility model may include a conductor frame 1 and a plurality of optical fiber sensor probes 2. The conductor frame 1 is fixedly arranged underwater, and the conductor frame 1 is used to fix the position of the riser 3. The plurality of optical fiber sensor probes 2 are distributed in sequence along the length direction of the riser 3. The optical fiber sensor probes 2 can detect the stress of the riser 3 in real time.

[0027] Specifically, the conductor frame 1 is fixedly arranged underwater, and its shape and size can be designed according to the specific underwater environment and the specifications of the riser 3. The main function of the conductor frame 1 is to fix the position of the riser 3 and prevent the riser 3 from being displaced or deformed due to external forces such as water flow, so as to avoid the removal of part of the stress due to the movement of the riser 3, so that the measured stress data of the riser 3 can be more accurate. The optical fiber sensor probe 2 is used to detect the stress change of the riser 3 in real time, and multiple optical fiber sensor probes 2 are distributed in sequence along the length direction of the riser 3 to ensure that the stress of the entire riser 3 is monitored in an all-round manner.

[0028] When the riser 3 is subjected to external forces such as water flow and pressure, its stress state will change. These changes will cause changes in the optical properties inside the optical fiber sensor probe 2, such as light intensity and phase. These changes are converted into electrical signals by the optical fiber sensor probe 2 and transmitted to the data processing center on the ground. The data processing center analyzes and processes these signals to obtain the real-time stress state of the riser 3.

[0029] In general, the underwater riser stress detection device of the utility model can realize real-time detection of the stress of the riser 3 by fixing the riser 3 with the conductor frame 1 and then using the optical fiber sensor probe 2 to detect the riser 3. In this way, the underwater riser stress detection device can realize real-time and continuous monitoring of the stress state of the riser 3, effectively improve the safety and reliability of the riser 3 structure, and reduce the detection cost.

[0030] In one example, the conductor frame 1 includes a fixed pile pipe 4, which is laid along the length direction of the riser 3, and one end of the pile pipe 4 is fixedly connected to the above-water platform, and the other end is fixed to the bottom of the water.

[0031] Specifically, the pile pipe 4 serves as a fixed support for the riser 3 and guides the installation of the riser 3. The upper end of the pile pipe 4 is fixed to the above-water platform, and the lower end is driven into the seabed or underwater foundation layer to form a stable connection with the seabed rock or soil, thereby ensuring the overall stability of the pile pipe 4. The length of the pile pipe 4 can be determined according to the water depth and engineering requirements.

[0032] In one example, the jacket 1 further includes a lateral support 5, which is located on one side of the pile pipe 4, and one end of the lateral support 5 is fixedly connected to the pillar of the water platform, and the other end is fixed to the pile pipe 4. The lateral support 5 is arranged between the pillar of the water platform and the pile pipe 4, and can provide lateral support force (including but not limited to support force in the horizontal direction) for the pile pipe 4, so as to prevent the pile pipe 4 from being broken due to excessive lateral stress.

[0033] In one example, the pile pipe 4 is detachably connected to the riser 3 via a guide card 6 , which is fixedly disposed on a side of the riser 3 facing the pile pipe 4 . The guide card 6 matches the structure of the pile pipe 4 and can be fixed on the pile pipe 4 .

[0034] Specifically, one end of the guide card 6 can be fixed on the riser 3 by welding, and the other end can be a block structure that matches the structure and size of the pile pipe 4 and can be detachably fixed on the pile pipe 4 to facilitate the disassembly and assembly of the riser 3.

[0035] In one example, the detection device includes at least three optical fiber sensor probes 2 installed at the elbow section between the riser 3 and the horizontal pipe. Among them, the first optical fiber sensor probe 2 is installed on the riser 3 and close to the elbow, the second optical fiber sensor probe 2 is installed in the middle section of the elbow, and the third optical fiber sensor probe 2 is installed on the horizontal pipe and close to the elbow. The three optical fiber sensor probes 2 can better detect the complex stress changes in the elbow section between the riser 3 and the horizontal pipe, so that the elbow is effectively monitored, and the safety and reliability of the riser 3 structure are improved.

[0036] In one example, two measurement channels are encapsulated in the optical fiber sensing probe 2, and the two measurement channels form a two-dimensional optical fiber Bragg grating sensing detection layout.

[0037] Specifically, two measuring channels are encapsulated in the optical fiber sensing probe 2, one of which can detect the radial stress of the riser 3, and the other can detect the axial stress of the riser 3, thus forming a two-dimensional optical fiber Bragg grating sensing detection layout that can simultaneously measure the radial stress and axial stress of the riser 3. The two-dimensional optical fiber Bragg grating sensing detection layout can more efficiently and reliably monitor and protect the riser 3 through precise sensor design and network layout optimization.

[0038] In one example, each measurement channel includes two fiber grating sensors and a temperature compensation sensor connected in series by an optical fiber.

[0039] Specifically, two fiber Bragg grating sensors can be attached to the outer surface of the riser 3 or pre-buried in the outer wall of the riser 3, which can detect the impact, shape control and vibration damping of the riser 3, and can also monitor whether there are defects in the riser 3. The temperature compensation sensor is used to solve the temperature and strain cross-sensitivity problem that the fiber Bragg grating sensor may encounter during the measurement process, thereby achieving accurate differentiation and measurement of temperature and strain, which can improve the measurement accuracy and reliability.

[0040] In one example, the fiber Bragg grating sensor can be a point sensor, a long gauge length sensor, or an area distributed sensor to ensure the stability and reliability of the measurement results of the fiber Bragg grating sensor.

[0041] In an example, Figure 2 As shown, the detection device further includes a protective layer 8 for protecting the optical fiber sensing probe 2 . The optical fiber sensing probe 2 is formed with a scanning surface 7 surrounding the riser 3 , and the protective layer 8 covers the scanning surface 7 .

[0042] Specifically, the optical fiber sensing probe 2 is attached to the outer surface of the riser 3 or embedded in the outer wall of the riser 3, and a scanning surface 7 is formed around the riser 3, wherein the optical fiber grating sensor can determine the change of stress or displacement by monitoring the change of the optical fiber grating wavelength. The protective layer 8 is sleeved on the outside of the optical fiber sensing probe 2, and can cover the scanning surface 7 to protect the optical fiber sensing probe 2. It should be noted that the setting of the protective layer 8 and the selected material will not interfere with the detection of the optical fiber sensing probe 2.

[0043] In one example, the detection device further includes a demodulation system and a data processing center. The demodulation system is connected to the optical fiber sensor probe 2 via a transmission optical fiber, and the data processing center is connected to the demodulation system via a data transmission network cable.

[0044] Specifically, during operation, multiple fiber optic sensor probes 2 can transmit the detected signals to the demodulation system via the transmission optical fiber. The demodulation system converts the detected signals into data and then transmits the data to the data processing center installed in the computer equipment through the data transmission network cable for data processing. In this way, during the actual operation, the data processing center can receive and process the signals transmitted by the fiber optic sensor probes 2 in real time, and obtain the real-time stress state of the riser 3. When the stress exceeds the preset safety threshold, the data processing center can automatically issue an alarm through the computer equipment to remind the operator to take corresponding measures to realize the early warning function, which can ensure the safe operation of the riser 3 and reduce economic losses. The specific signal and data transmission process is as follows: Figure 3 As shown, FBG refers to fiber grating sensor.

[0045] It should be noted that multiple fiber optic sensor probes 2 can be connected in series to form a quasi-distributed sensor network to achieve comprehensive monitoring of the riser 3. This network can be remotely controlled by computer equipment to monitor the health of the riser 3 in real time. Secondly, the structure of the fiber grating sensor can be specially designed according to the different requirements of engineering measurement to ensure the accuracy and repeatability of the measurement results. Furthermore, in order to improve the coverage and efficiency of the sensor network, an optical fiber sensor network layout optimization method based on an improved particle swarm algorithm can be used to improve the convergence accuracy of the algorithm by adjusting the inertia weight and learning factor, and its superiority in solving the sensor node coverage optimization problem is verified through simulation experiments.

[0046] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An underwater riser stress detection device, characterized in that: The detection device includes a conductor frame and multiple optical fiber sensor probes. The conductor frame is fixedly arranged underwater and is used to fix the position of the riser. The multiple optical fiber sensor probes are distributed in sequence along the length direction of the riser. The optical fiber sensor probes can detect the stress of the riser in real time.

2. The underwater riser stress detection device according to claim 1, characterized in that: The conductor frame includes a fixed pile pipe, which is laid along the length direction of the riser, and one end of the pile pipe is fixedly connected to the water platform, and the other end is fixed to the bottom of the water.

3. The underwater riser stress detection device according to claim 2, characterized in that: The conductor frame also includes a lateral support, which is located on one side of the pile pipe, and one end of the lateral support is fixedly connected to the support column of the above-water platform, and the other end is fixed to the pile pipe.

4. The underwater riser stress detection device according to claim 2, characterized in that: The pile pipe is detachably connected to the stand pipe via a guide card, the guide card is fixedly arranged on a side of the stand pipe facing the pile pipe, and the guide card matches the structure of the pile pipe and can be fixed on the pile pipe.

5. The underwater riser stress detection device according to claim 1, characterized in that: The detection device comprises at least three optical fiber sensing probes installed in the connecting elbow section between the vertical pipe and the horizontal pipe.

6. The underwater riser stress detection device according to claim 1, characterized in that: Two measuring channels are encapsulated in the optical fiber sensing probe, and the two measuring channels form a two-dimensional optical fiber grating sensing detection layout.

7. The underwater riser stress detection device according to claim 6, characterized in that: Each of the measuring channels includes two fiber grating sensors and a temperature compensation sensor connected in series by an optical fiber.

8. The underwater riser stress detection device according to claim 7, characterized in that: The fiber grating sensor is a point sensor, a long gauge distance sensor or a regional distributed sensor.

9. The underwater riser stress detection device according to claim 1, characterized in that: The detection device further comprises a protective layer for protecting the optical fiber sensing probe. The optical fiber sensing probe is formed with a scanning surface surrounding the riser, and the protective layer covers the scanning surface.

10. The underwater riser stress detection device according to claim 1, characterized in that: The detection device also includes a demodulation system and a data processing center. The demodulation system is connected to the optical fiber sensor probe via a transmission optical fiber, and the data processing center is connected to the demodulation system via a data transmission network cable.

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