Vibration monitoring device and method for deepwater drilling riser

Abstract

The invention relates to a deepwater drilling riser vibration monitoring device and method, and the device is characterized in that the device comprises a pressure-resistant housing, a circuit module, and a battery module; the pressure-resistant shell is installed on the marine riser, an inflation one-way valve and an exhaust connector are arranged on the pressure-resistant shell, an inflation one-way valve plug is arranged on the inflation one-way valve, and the inflation one-way valve is used for taking down the inflation one-way valve plug to inflate inert gas into the pressure-resistant shell when needed; the exhaust connector is used for replacing conventional air containing water vapor in the pressure-resistant shell when inert gas is filled; a circuit module and a battery module are arranged in the pressure-resistant shell, the circuit module comprises a vibration monitoring board, a CPU board and a power board, and the vibration monitoring board is used for monitoring six-axis vibration data of the marine riser in real time; according to the marine riser monitoring system, the marine riser can be accurately monitored, and the marine riser monitoring system can be widely applied to the technical field of marine deepwater drilling.

Description

Technical Field

[0001] The present invention relates to the technical field of deepwater marine drilling, and in particular to a deepwater drilling riser vibration monitoring device and method. Background Art

[0002] With the advancement of science and technology and the continuous improvement of human cognition of marine oil resources, marine oil exploration and development has developed from conventional water depth (less than 500m) to deep water (500m~1500m) and ultra-deep water (greater than 1500m). Although the exploration and development of marine oil and gas has brought huge benefits, it is also accompanied by huge risks in the development process. Deep-sea oil and gas drilling in ultra-deep waters from 1500m to 3000m deep faces greater technical challenges: complex environmental loads, more complex temperature and pressure fields, and more complex working conditions. Under ultra-deep water conditions, due to harsh production conditions, high construction difficulty, complex equipment, and the influence of uncontrollable factors such as sea breeze, waves, and currents, deep-water oil development has become a high-investment, high-tech and high-risk industry. For the risks in the process of deep-sea oil exploration and development operations, if they cannot be identified and effective measures are taken to control them, once an accident occurs, not only will it be difficult to control and rescue the accident, but the losses will also be difficult to estimate.

[0003] The drilling riser is the throat connecting the sea surface operating platform and the submarine wellhead. In deep water or even ultra-deep water with a depth of more than one thousand meters in the ocean, the diameter-to-length ratio of the riser reaches the range of a slender and flexible elastic body. The movement of the riser is a flexible elastic movement rather than a rigid body movement, which causes the amplitude of the riser to increase significantly, and is prone to a series of problems such as fatigue, damage, fracture and leakage. With the gradual deepening of oil and gas development operations in deep and ultra-deep waters, the demand for deep and ultra-deep drilling riser monitoring systems has become more and more urgent. The motion state and fatigue response of deepwater drilling risers cannot be ignored. As an important content and device in the monitoring system, the vibration monitoring device collects vibration information such as the acceleration and angular velocity of the riser, analyzes and obtains the motion state and fatigue response of the riser, and plays an important role in the safety of the riser.

[0004] However, the current drilling riser vibration monitoring is mainly three-dimensional acceleration or stress monitoring, and there is no six-axis monitoring. The lack of monitoring data cannot truly and effectively reflect the riser vibration information. Therefore, a deepwater drilling riser vibration monitoring device is urgently needed to realize deep riser vibration monitoring. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide a deepwater drilling riser vibration monitoring device and method that can truly and effectively reflect the riser vibration information.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solutions: On the one hand, a deepwater drilling riser vibration monitoring device is provided, including a pressure-resistant housing, a circuit module and a battery module; The pressure-resistant shell is installed on the watertight riser, and an inflation check valve and an exhaust joint are arranged on the pressure-resistant shell. The inflation check valve is provided with an inflation check valve plug. The inflation check valve is used to remove the inflation check valve plug when necessary to fill the pressure-resistant shell with inert gas; the exhaust joint is used to replace the conventional air containing water vapor in the pressure-resistant shell when the inert gas is filled; The circuit module and battery module are arranged in the pressure-resistant shell, and the circuit module includes a vibration monitoring board, a CPU board and a power supply board. The vibration monitoring board is used for real-time monitoring of the six-axis vibration data of the watertight pipe; the CPU board is used for performing clock calibration on the six-axis vibration data collected by the vibration monitoring board in real time, and controlling the periodic wake-up and periodic sleep of the vibration monitoring board; the battery module is used for providing power to the circuit module; and the power supply board is used for providing the circuit module with a voltage that meets the requirements based on the power provided by the battery module.

[0007] Furthermore, a dry underwater data connector is also provided on the pressure-resistant shell, one end of the dry underwater data connector is connected to the CPU board, and the other end of the dry underwater data connector is connected to a dedicated external data cable for transmitting the data processed by the CPU board to an external host computer; a dry underwater data connector plug is also provided on the dry underwater data connector.

[0008] Furthermore, a dry underwater charging connector is also provided on the pressure-resistant shell, and the dry underwater charging connector is connected to the battery module for charging the battery module; a dry underwater charging connector plug is also provided on the dry underwater charging connector.

[0009] Further, the pressure hull comprises a pressure cabin, a lower end cover and an upper end cover; The bottom of the pressure-resistant cabin is fixedly connected to the lower end cover, and the top of the pressure-resistant cabin is fixedly connected to the upper end cover; the circuit module and the battery module are fixedly arranged in the pressure-resistant cabin.

[0010] Furthermore, the inflation one-way valve and the exhaust connector are arranged on the lower end cover, and the dry underwater data connector and the dry underwater charging connector are arranged on the upper end cover.

[0011] Further, the vibration monitoring board includes a vibration monitoring board and a data recording module; The vibration monitoring board is used to monitor the six-axis vibration data of the watertight pipe in real time and send it to the data recording module and the CPU board; The data recording module is used to record the six-axis vibration data monitored by the vibration monitoring board in real time.

[0012] Furthermore, the CPU board includes a main board, on which an embedded single-chip microcomputer, a communication circuit and a clock circuit are arranged; The embedded single chip microcomputer is used to control the hardware circuit of the monitoring device to work according to a preset process based on the start monitoring time provided by the external host computer; The communication circuit is used to communicate with the vibration monitoring board, receive the six-axis vibration data monitored by the vibration monitoring board, and send it to an external host computer through the dry underwater data connector; and receive the start monitoring time of the vibration monitoring board sent by the external host computer through the dry underwater data connector; The clock circuit is used to realize the periodic wake-up and periodic sleep of the vibration monitoring board, and to allocate time for the collected six-axis vibration data.

[0013] On the other hand, a method for monitoring vibration of a deepwater drilling riser is provided, comprising: Install deepwater drilling riser vibration monitoring device; Installing a deepwater drilling riser vibration monitoring device on the riser; The vibration monitoring board monitors the six-axis vibration data of the riser in real time and sends it to the CPU board; The CPU board calibrates the clock of the six-axis vibration data collected in real time by the vibration monitoring board, controls the wake-up and sleep of the vibration monitoring board, and transmits it to the external host computer; During use, the battery module provides sufficient power for the circuit module, and the power board provides voltage for the circuit module based on the power provided by the battery module.

[0014] Furthermore, after the deepwater drilling riser vibration monitoring device is provided, it also includes: Nitrogen is injected into the pressure cabin through the inflation one-way valve, so that the original conventional air containing water vapor inside the pressure cabin is discharged from the pressure cabin through the exhaust joint, thereby realizing nitrogen replacement.

[0015] Furthermore, the CPU board performs clock calibration on the six-axis vibration data collected in real time by the vibration monitoring board, controls the wake-up start and sleep of the vibration monitoring board, and transmits the data to the external host computer, including: The communication circuit receives the start monitoring time of the vibration monitoring board sent by the external host computer; Based on the start monitoring time provided by the external host computer, the embedded single chip microcomputer controls the hardware circuit of the monitoring device through the clock circuit to work according to the preset process, including the data acquisition and processing of the vibration monitoring board and the wake-up start, sleep and re-wake-up start of the record; The communication circuit receives the six-axis vibration data monitored by the vibration monitoring board and sends it to the external host computer; The clock circuit distributes time for the collected six-axis vibration data.

[0016] The present invention adopts the above technical solution, which has the following advantages: 1. The present invention is installed on the drilling riser and can collect six-axis vibration data of the riser, which is used to analyze and obtain the motion state and fatigue response of the riser, and plays an important role in the safety of the riser.

[0017] 2. The data monitored by the monitoring sensor in the prior art only includes three-dimensional acceleration, and does not record three-dimensional angular velocity. At present, technicians in this field artificially only need to perform three-dimensional acceleration monitoring to perform fatigue damage assessment, but in fact the assessment accuracy is not high. The data that can be collected by the present invention include three-dimensional acceleration and three-dimensional angular velocity data. The three-dimensional angular velocity can be used to correct the three-dimensional position of the sensor, and the data files such as the monitoring start time can be stored, thereby realizing accurate monitoring of the watertight pipe.

[0018] 3. The pressure-resistant shell of the present invention is provided with an inflation check valve and an exhaust joint, which can be used to fill the pressure-resistant shell with inert gas to replace the conventional air containing water vapor inside the shell, thereby dehumidifying and preventing moisture, and protecting the internal hardware circuit of the sensor.

[0019] 4. A dry underwater data connector is provided on the pressure-resistant shell of the present invention and connected to the circuit module, so as to realize data transmission and communication with the circuit module.

[0020] 5. A dry underwater charging connector is provided on the pressure-resistant shell of the present invention and connected to the power module to realize battery charging.

[0021] In summary, the present invention can be widely used in the field of deep-water ocean drilling technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings: Figure 1 It is a schematic diagram of the structure of a device provided by an embodiment of the present invention.

[0023] The symbols in the accompanying drawings are: 1-pressure-resistant shell; 2-circuit module; 3-battery module; 4-inflatable one-way valve; 5-exhaust connector; 6-dry underwater data connector; 7-dry underwater charging connector; 8-hexagon socket screw; 9-sealing retaining ring; 11-pressure hull; 12-lower end cover; 13-upper end cover; 14-eye bolt; 41-Inflatable one-way valve plug; 61-Dry underwater data connector plug; 71-Dry underwater charging connector plug. DETAILED DESCRIPTION

[0024] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0025] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0026] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0027] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0028] The drilling riser is the key point connecting the sea surface operating platform and the submarine wellhead. In deep water or even ultra-deep water with a depth of more than one kilometer, the diameter-to-length ratio of the riser reaches the range of a slender and flexible elastic body. The movement of the riser is a flexible elastic movement rather than a rigid body movement, which leads to a significant increase in the amplitude of the riser, which is prone to fatigue, damage, fracture and leakage. With the gradual deepening of oil and gas development operations in deep and ultra-deep waters, the demand for deep and ultra-deep drilling riser monitoring systems has become more and more urgent. The motion state and fatigue response of deepwater drilling risers cannot be ignored. As an important content and device in the monitoring system, the vibration monitoring device collects vibration information such as riser acceleration and angular velocity, analyzes and obtains the motion state and fatigue response of the riser, which plays an important role in the safety of the riser. However, the current drilling riser vibration monitoring is mainly three-dimensional acceleration or stress monitoring, and there is no six-axis (three-dimensional acceleration and three-dimensional angular velocity) monitoring. The lack of monitoring data cannot truly and effectively reflect the vibration information of the riser. Therefore, there is an urgent need for a deepwater drilling riser vibration monitoring device to realize deep riser vibration monitoring. An embodiment of the present invention provides a deepwater drilling riser vibration monitoring device, including a pressure-resistant shell, a circuit module and a battery module; the pressure-resistant shell is installed on the riser, and an inflation check valve and an exhaust joint are provided on the pressure-resistant shell, and an inflation check valve plug is provided on the inflation check valve, and the inflation check valve is used to remove the inflation check valve plug when necessary to fill the pressure shell with inert gas; the exhaust joint is used to replace the conventional air containing water vapor in the pressure shell when the inert gas is filled; A circuit module and a battery module are arranged in the pressure-resistant shell. The circuit module includes a vibration monitoring board, a CPU board and a power supply board. The vibration monitoring board is used to monitor the six-axis vibration data of the watertight pipe in real time; the CPU board is used to perform clock calibration on the six-axis vibration data collected by the vibration monitoring board in real time, and control the wake-up, start-up and sleep of the vibration monitoring board; the battery module is used to provide power to the circuit module; the power supply board is used to provide the circuit module with a voltage that meets the requirements based on the power provided by the battery module. As an important content and device in the monitoring system, the vibration monitoring device of the present invention collects vibration information such as acceleration and angular velocity of the watertight pipe, analyzes and obtains the motion state and fatigue response of the watertight pipe, and plays an important role in ensuring the safety of the watertight pipe. The present invention has a compact structure and strong resistance to external pressure. It can be installed on the watertight pipe. The collected and recorded vibration data such as acceleration and angular velocity are mainly used to predict the motion state, fatigue response and the like of the watertight pipe.

[0029] Example 1 like Figure 1 As shown, this embodiment provides a deepwater drilling riser vibration monitoring device, including a pressure-resistant shell 1, a circuit module 2 and a battery module 3, wherein the circuit module 2 includes a vibration monitoring board, a CPU board and a power board.

[0030] The pressure-resistant shell 1 is installed on the watertight pipe to withstand the external seawater pressure and provide protection for the internal circuit module 2 and battery module 3. The pressure-resistant shell 1 is provided with an inflation check valve 4 and an exhaust joint 5. The inflation check valve 4 is provided with an inflation check valve plug 41. The inflation check valve 4 is used to remove the inflation check valve plug 41 when necessary to fill the pressure-resistant shell 1 with inert gas. The exhaust joint 5 is used to replace the conventional air containing water vapor in the pressure-resistant shell 1 when the inert gas is filled, so as to achieve dehumidification and moisture-proofing in the pressure-resistant shell 1 and protect the hardware circuit of the monitoring device.

[0031] A circuit module 2 and a battery module 3 are provided in the pressure-resistant shell 1. The vibration monitoring board of the circuit module 2 is used to collect and store the three-dimensional acceleration and three-dimensional angular velocity of the watertight pipe, i.e., six-axis vibration data in real time. The CPU board of the circuit module 2 is used to perform clock calibration on the six-axis vibration data collected in real time by the vibration monitoring board, and to control the wake-up, start-up and sleep of the vibration monitoring board. The battery module 3 is used to provide sufficient power for the circuit module 2. The power board of the circuit module 2 is used to provide a stable and appropriate voltage for the circuit module 2 based on the power provided by the battery module 3.

[0032] In a preferred embodiment, a dry underwater data connector 6 is also provided on the pressure-resistant shell 1, one end of the dry underwater data connector 6 is connected to the CPU board, and the other end of the dry underwater data connector 6 is connected to a dedicated external data line for transmitting the data processed by the CPU board to the monitoring device data management software installed in the external host computer. A dry underwater data connector plug 61 is also provided on the dry underwater data connector 6 to withstand the high pressure and watertight requirements of the deep seabed and protect the data connector.

[0033] In a preferred embodiment, the pressure-resistant housing 1 is further provided with a dry underwater charging connector 7, which is connected to the battery module 3 for charging the battery module 3. The dry underwater charging connector 7 is also provided with a dry underwater charging connector plug 71 to withstand the high pressure and watertightness requirements of the deep seabed and protect the data connector.

[0034] In a preferred embodiment, the pressure hull 1 is made of high-strength metal material and has a hollow cylindrical structure, including a pressure hull 11, a lower end cover 12 and an upper end cover 13. The bottom of the pressure hull 11 is fixedly connected to the lower end cover 12 by a hexagon socket screw 8, and the top of the pressure hull 11 is fixedly connected to the upper end cover 13 by a hexagon socket screw 8. The circuit module 2 and the battery module 3 are fixedly arranged in the pressure hull 11 by the hexagon socket screw 8.

[0035] Specifically, an inflation one-way valve 4 and an exhaust connector 5 are provided on the lower end cover 12 , and a dry underwater data connector 6 and a dry underwater charging connector 7 are provided on the upper end cover 13 .

[0036] Specifically, a lifting eye bolt 14 is also provided on the upper end cover 13 to facilitate the lifting and use of the monitoring device.

[0037] In a preferred embodiment, the vibration monitoring board includes a vibration monitoring board and a data recording module. The vibration monitoring board is used to monitor the three-dimensional acceleration and three-dimensional angular velocity of the watertight pipe in real time, that is, six-axis vibration data, and send them to the data recording module and the CPU board. The data recording module is used to record the six-axis vibration data monitored by the vibration monitoring board in real time.

[0038] In a preferred embodiment, the CPU board includes a main board, an embedded single-chip microcomputer, a communication circuit and a clock circuit, and the main board is provided with an embedded single-chip microcomputer, a communication circuit and a clock circuit.

[0039] The embedded single chip microcomputer is used to control the hardware circuit of the monitoring device to work according to a preset process based on the start monitoring time provided by the external host computer, including the data acquisition and processing of the vibration monitoring board and the recorded wake-up start, sleep and re-wake-up start.

[0040] The communication circuit is used to communicate with the vibration monitoring board, receive the six-axis vibration data monitored by the vibration monitoring board, and send it to the external host computer through the dry underwater data connector 6; and receive the start monitoring time of the vibration monitoring board sent by the external host computer through the dry underwater data connector 6.

[0041] The clock circuit is used to realize the periodic wake-up and sleep of the vibration monitoring board (for example, the vibration monitoring board collects signals for 10 minutes every hour, and enters the sleep state after collecting and recording for 10 minutes; it sleeps for 50 minutes and wakes up through the clock circuit to collect and record the next round of data), and assigns the correct time to the collected six-axis vibration data.

[0042] In a preferred embodiment, the power board includes a voltage reduction filter module and a power management module. The voltage reduction filter module is used to reduce the voltage of the power provided by the battery module 3 and provide a stable voltage for the vibration monitoring board and the CPU board. The power management module is used to regularly record the voltage of the battery module 3.

[0043] In a preferred embodiment, the battery module 3 includes a battery and a battery protection board, the battery is used to provide sufficient power for the circuit module 2, and the battery protection board is used to protect the battery from overcharging, overdischarging, overcurrent and short circuit.

[0044] In a preferred embodiment, sealing rings 9 are provided on both the lower end cover 12 and the upper end cover 13 for sealing with the pressure-resistant cabin, and when the monitoring device is working normally, the high pressure of the external seawater is withstood to achieve the watertight requirement inside the monitoring device.

[0045] Example 2 This embodiment provides a deepwater drilling riser vibration monitoring method, comprising the following steps: 1) The deepwater drilling riser vibration monitoring device of Example 1 is provided.

[0046] Specifically, after the circuit module 2, the battery module 3, the lower end cover 12 and the upper end cover 13 are installed, nitrogen is injected into the pressure cabin 11 through the inflation check valve 4, so that the original conventional air containing water vapor inside the pressure cabin 11 is discharged from the pressure cabin 11 through the exhaust joint 5, thereby realizing nitrogen replacement, and further achieving dehumidification and moisture-proofing inside the pressure cabin 11.

[0047] 2) Install the deepwater drilling riser vibration monitoring device on the riser.

[0048] 3) The vibration monitoring board monitors the six-axis vibration data of the riser in real time and sends it to the CPU board. Specifically: 3.1) The vibration monitoring board monitors the three-dimensional acceleration and three-dimensional angular rate of the watertight pipe in real time, that is, the six-axis vibration data, and sends it to the data recording module and the CPU board.

[0049] 3.2) The data recording module records the six-axis vibration data monitored by the vibration monitoring board in real time.

[0050] 4) The CPU board calibrates the clock of the six-axis vibration data collected in real time by the vibration monitoring board, controls the wake-up and sleep of the vibration monitoring board, and transmits the data to the monitoring device data management software installed in the external host computer through the dry underwater data connector 6, specifically: 4.1) The communication circuit receives the start monitoring time of the vibration monitoring board sent by the external host computer through the dry underwater data connector 6.

[0051] 4.2) Based on the start monitoring time provided by the external host computer, the embedded single chip microcomputer controls the hardware circuit of the monitoring device through the clock circuit to work according to the pre-set process, including the data acquisition and processing of the vibration monitoring board and the recorded wake-up start, sleep and re-wake-up start.

[0052] 4.3) The communication circuit receives the six-axis vibration data monitored by the vibration monitoring board and sends it to the external host computer through the dry underwater data connector 6.

[0053] 4.4) The clock circuit assigns the correct time to the collected six-axis vibration data.

[0054] 5) During use, the battery module 3 provides sufficient power for the circuit module 2 , and the power board of the circuit module 2 provides a stable and appropriate voltage for the circuit module 2 based on the power provided by the battery module 3 .

[0055] 6) When the battery module 3 is low on power, the battery module 3 is replaced or charged via the dry underwater charging connector 7 .

[0056] The above embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component may be changed. Any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A deepwater drilling riser vibration monitoring device, characterized in that: It includes a pressure-resistant housing, a circuit module and a battery module; The pressure-resistant shell is installed on the watertight riser, and an inflation check valve and an exhaust joint are arranged on the pressure-resistant shell. The inflation check valve is provided with an inflation check valve plug. The inflation check valve is used to remove the inflation check valve plug when necessary to fill the pressure-resistant shell with inert gas; the exhaust joint is used to replace the conventional air containing water vapor in the pressure-resistant shell when the inert gas is filled; The circuit module and battery module are arranged in the pressure-resistant shell, and the circuit module includes a vibration monitoring board, a CPU board and a power supply board. The vibration monitoring board is used for real-time monitoring of the six-axis vibration data of the watertight pipe; the CPU board is used for performing clock calibration on the six-axis vibration data collected by the vibration monitoring board in real time, and controlling the periodic wake-up and periodic sleep of the vibration monitoring board; the battery module is used for providing power to the circuit module; and the power supply board is used for providing the circuit module with a voltage that meets the requirements based on the power provided by the battery module.

2. A deepwater drilling riser vibration monitoring device as claimed in claim 1, characterized in that: The pressure-resistant shell is also provided with a dry underwater data connector, one end of which is connected to the CPU board, and the other end of which is connected to a dedicated external data line for transmitting the data processed by the CPU board to an external host computer; the dry underwater data connector is also provided with a dry underwater data connector plug.

3. A deepwater drilling riser vibration monitoring device as claimed in claim 1, characterized in that: The pressure-resistant shell is also provided with a dry underwater charging connector, which is connected to the battery module and is used to charge the battery module; the dry underwater charging connector is also provided with a dry underwater charging connector plug.

4. A deepwater drilling riser vibration monitoring device as claimed in claim 1, characterized in that: The pressure hull comprises a pressure cabin, a lower end cover and an upper end cover; The bottom of the pressure-resistant cabin is fixedly connected to the lower end cover, and the top of the pressure-resistant cabin is fixedly connected to the upper end cover; the circuit module and the battery module are fixedly arranged in the pressure-resistant cabin.

5. A deepwater drilling riser vibration monitoring device as claimed in claim 4, characterized in that: The inflation one-way valve and the exhaust connector are arranged on the lower end cover, and the dry underwater data connector and the dry underwater charging connector are arranged on the upper end cover.

6. A deepwater drilling riser vibration monitoring device as claimed in claim 1, characterized in that: The vibration monitoring board includes a vibration monitoring board and a data recording module; The vibration monitoring board is used to monitor the six-axis vibration data of the watertight pipe in real time and send it to the data recording module and the CPU board; The data recording module is used to record the six-axis vibration data monitored by the vibration monitoring board in real time.

7. A deepwater drilling riser vibration monitoring device as claimed in claim 2, characterized in that: The CPU board includes a main board, on which an embedded single-chip microcomputer, a communication circuit and a clock circuit are arranged; The embedded single chip microcomputer is used to control the hardware circuit of the monitoring device to work according to a preset process based on the start monitoring time provided by the external host computer; The communication circuit is used to communicate with the vibration monitoring board, receive the six-axis vibration data monitored by the vibration monitoring board, and send it to an external host computer through the dry underwater data connector; and receive the start monitoring time of the vibration monitoring board sent by the external host computer through the dry underwater data connector; The clock circuit is used to realize the periodic wake-up and periodic sleep of the vibration monitoring board, and to allocate time for the collected six-axis vibration data.

8. A method for monitoring vibration of a deepwater drilling riser, characterized in that: include: A deepwater drilling riser vibration monitoring device as claimed in any one of claims 1 to 7 is provided; Installing a deepwater drilling riser vibration monitoring device on the riser; The vibration monitoring board monitors the six-axis vibration data of the watertight pipe in real time and sends it to the CPU board; The CPU board calibrates the clock of the six-axis vibration data collected in real time by the vibration monitoring board, controls the wake-up and sleep of the vibration monitoring board, and transmits it to the external host computer; During use, the battery module provides sufficient power for the circuit module, and the power board provides voltage for the circuit module based on the power provided by the battery module.

9. A deepwater drilling riser vibration monitoring method as claimed in claim 8, characterized in that: After the deepwater drilling riser vibration monitoring device is provided, the method further comprises: Nitrogen is injected into the pressure cabin through the inflation one-way valve, so that the original conventional air containing water vapor inside the pressure cabin is discharged from the pressure cabin through the exhaust joint, thereby realizing nitrogen replacement.

10. A deepwater drilling riser vibration monitoring method as claimed in claim 8, characterized in that: The CPU board performs clock calibration on the six-axis vibration data collected in real time by the vibration monitoring board, controls the wake-up start and sleep of the vibration monitoring board, and transmits the data to the external host computer, including: The communication circuit receives the start monitoring time of the vibration monitoring board sent by the external host computer; Based on the start monitoring time provided by the external host computer, the embedded single chip microcomputer controls the hardware circuit of the monitoring device through the clock circuit to work according to the preset process, including the data acquisition and processing of the vibration monitoring board and the wake-up start, sleep and re-wake-up start of the record; The communication circuit receives the six-axis vibration data monitored by the vibration monitoring board and sends it to the external host computer; The clock circuit distributes time for the collected six-axis vibration data.

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