Method and system for managing fatigue life of deepwater drilling riser

Abstract

The invention belongs to the technical field of marine drilling riser, and relates to a deepwater drilling riser fatigue life management method and system, and the method comprises the steps: obtaining the configuration information and structure parameter information of a riser through reading an electronic tag of the riser; according to the configuration information and the structure parameter information of the marine riser, wave-induced fatigue and vortex-induced fatigue analysis is carried out, so that the comprehensive fatigue damage and the service life of the marine riser are predicted; performing risk assessment according to wave-induced fatigue and vortex-induced fatigue analysis results; according to a risk assessment result, overhaul optimization is carried out, high-risk items are directly overhauled, for medium-low-risk items, the total process cost is calculated based on the defect type of the marine riser, a genetic algorithm optimization method is adopted, the minimum process use cost is used as a target function, self-adaptive optimization is carried out, and the most economical overhaul scheme of the marine riser is obtained. Individual identity information is given to the marine riser, information traceability in the whole life cycle is ensured, and automatic updating and efficient management of marine riser data are achieved.

Description

Technical Field

[0001] The present invention relates to a deepwater drilling riser fatigue life management method and system, belonging to the technical field of marine drilling risers. Background Art

[0002] Deepwater drilling risers, the core equipment connecting offshore drilling platforms to subsea wellheads, perform multiple critical functions in oil and gas exploration and development. They not only create a circulation channel for drilling fluid and carry various auxiliary pipelines, but also shoulder the crucial tasks of guiding drill string lowering and equipping blowout prevention systems. These hundreds-of-meter-long pipe systems exhibit remarkable flexibility in deepwater environments. Their nonlinear dynamic characteristics make them susceptible to complex dynamic responses under the combined effects of marine environmental loads (such as waves and currents) and operational loads (such as platform motion and drilling operations). These dynamic effects can accumulate structural fatigue damage, and in severe cases, can lead to catastrophic accidents such as pipe fracture.

[0003] Fatigue life management for deepwater drilling risers requires the construction of a digital management system covering the entire design, manufacturing, and service life cycle. By fully recording the basic parameters of the pipe body (such as material properties and connection forms), service history (including operating water depth and environmental load spectrum), and maintenance information (inspection records and damage repair status), fatigue damage assessment and life prediction can be systematically carried out. This data-driven management method can not only accurately quantify the remaining life, but also establish a risk warning mechanism. That is, when the assessment results show that fatigue damage is approaching the safety threshold, special inspection and repair procedures are promptly initiated to effectively prevent and control failure risks and ensure operational safety. Although preliminary research has been conducted in this field, the existing management methods still have three major bottlenecks: the lack of professional assessment models, the imperfect digital management platform, and the insufficient data collection accuracy. These defects seriously restrict the improvement of the safe operation and maintenance level of risers. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to provide a deepwater drilling riser fatigue life management method and system, which solves the problems of low degree of digitization and low data accuracy in existing riser fatigue life management methods.

[0005] To achieve the above-mentioned objectives, the present invention proposes the following technical solutions: a deep-water drilling riser fatigue life management method, comprising the following steps: obtaining riser configuration information and structural parameter information by reading the riser's electronic tag; performing wave-induced fatigue and vortex-induced fatigue analysis based on the riser configuration information and structural parameter information, thereby predicting the comprehensive fatigue damage and service life of the riser; performing risk assessment based on the results of the wave-induced fatigue and vortex-induced fatigue analysis; performing maintenance optimization based on the results of the risk assessment, directly performing maintenance on high-risk items, and calculating the total process cost based on the defect type of the riser for medium and low-risk items, using a genetic algorithm to optimize the maintenance method, and performing adaptive optimization with the lowest process usage cost as the objective function to obtain the most economical maintenance plan for the riser.

[0006] Furthermore, the watertight pipe system includes a watertight pipe, a buoyancy block, several auxiliary pipelines and a guide frame. The watertight pipe is fixed on the buoyancy block. Several auxiliary pipelines are provided on the buoyancy block to ensure the normal circulation of drilling fluid and the safe operation of the well control system; the guide frame is mounted on the watertight pipe to support and guide the watertight pipe; the electronic tag is set on the guide frame.

[0007] Furthermore, the electronic tag includes an identity recognition unit, a base plate, a shell and screws; the base plate is fixedly connected to the guide frame, the identity recognition unit is arranged between the base plate and the shell, and the shell fixes the identity recognition unit to the base plate through the screws.

[0008] Furthermore, the electronic tag is read by a radio frequency identification device, which includes a fixed radio frequency identification device and a handheld radio frequency identification device; the fixed radio frequency identification device and the handheld radio frequency identification device read the electronic tag at the same time; the fixed radio frequency identification device is connected to an antenna; the radio frequency identification device transmits the read data to a mobile workstation through a wireless network, and reads the watertight pipe configuration information and structural parameter information from the mobile workstation.

[0009] Furthermore, the mobile workstation includes an information visualization unit and a riser data management unit. The information visualization unit is used to display riser configuration information and structural parameter information, comprehensive fatigue damage and service life, risk assessment results and maintenance optimization results, and can interact with users to realize data addition, deletion, modification and query; the riser data management unit summarizes the riser configuration information and structural parameter information, comprehensive fatigue damage and service life, risk assessment results and maintenance optimization results, and stores them.

[0010] Furthermore, the wave-induced fatigue and vortex-induced fatigue analysis methods are as follows: recording the stress cycle data of the watertight pipe to obtain the stress-life curve; in the wave-induced fatigue analysis, the fatigue stress of the watertight pipe is statistically calculated using the rain flow counting method, and the fatigue damage of the watertight pipe is calculated based on the stress-life curve; then, based on the linear fatigue damage accumulation criterion, the long-term wave-induced fatigue damage is calculated based on the fatigue damage of the watertight pipe; in the vortex-induced fatigue analysis, the vortex-induced resonance response mode is identified based on the modal frequency and modal vibration mode of the watertight pipe, and then the vortex-induced fatigue damage of the watertight pipe is calculated based on the stress-life curve; combined with the fatigue damage occupancy rate under different operating modes and the Miner fatigue damage accumulation criterion, a comprehensive fatigue damage assessment is performed on the watertight pipe system, and the fatigue life is calculated based on the assessment results.

[0011] Furthermore, the method for risk assessment is: based on the results of wave-induced fatigue and vortex-induced fatigue analysis, the failure probability and failure consequences of the deep-water drilling riser are obtained, the failure probability and failure consequences of the deep-water drilling riser are quantitatively evaluated, a risk matrix is ​​generated, and a risk assessment level is generated based on the risk matrix.

[0012] Furthermore, the method for generating the risk matrix is: by establishing a single fatigue reliability analysis model for a watertight riser, defining random variables that affect the failure of the watertight riser, and using the Monte Carlo method to optimize the single fatigue reliability analysis model for the watertight riser, the random variables are updated to obtain the fatigue failure probability, and the fatigue failure probability is divided into several levels; the failure consequences are determined from the three aspects of safety, environment and economy, and the failure consequences are divided into several levels; and the risk matrix is ​​generated by comprehensively combining the fatigue failure probability level and the failure consequence level.

[0013] Furthermore, the method for obtaining the most economical maintenance plan for the watertight pipe is: defining a total cost model for the watertight pipe, the total cost model including inspection cost, maintenance cost and failure cost, combining the service time of the watertight pipe, the maximum failure probability, the minimum inspection interval and the bank interest rate, using a genetic algorithm to optimize the inspection method, with the lowest process usage cost as the objective function, if the objective function is met, the optimal maintenance plan is generated, if not, the genetic algorithm is used to generate a new population, and the total cost model is adaptively optimized until the objective function is met.

[0014] The present invention also discloses a deep-water drilling riser fatigue life management system, comprising: an electronic tag reading module, used to obtain riser configuration information and structural parameter information by reading the riser's electronic tag; a fatigue calculation module, used to perform wave-induced fatigue and vortex-induced fatigue analysis based on the riser configuration information and structural parameter information, thereby predicting the comprehensive fatigue damage and service life of the riser; a risk assessment module, used to perform risk assessment based on the wave-induced fatigue and vortex-induced fatigue analysis results; a maintenance optimization module, used to perform maintenance optimization based on the results of the risk assessment, directly perform maintenance on high-risk items, and calculate the total process cost based on the defect type of the riser for medium and low-risk items, use a genetic algorithm to optimize the maintenance method, and perform adaptive optimization with the lowest process usage cost as the objective function to obtain the most economical maintenance plan for the riser.

[0015] The technical solution of the present invention has at least the following technical effects or advantages: 1. This invention uses electronic tags to assign unique identity information to each riser, ensuring its information traceability throughout its entire life cycle; 2. The present invention realizes the automatic updating and efficient management of riser data, and effectively reduces the occurrence of human errors through automated data collection, storage and processing.

[0016] 3. This invention comprehensively monitors risers and records detailed information, significantly improving riser management efficiency and calculation accuracy. It provides strong data support for riser operation monitoring, maintenance decision-making, and performance optimization, and promotes the modernization of riser fatigue life management technology. 4. The present invention accurately evaluates the structural integrity of the riser through fatigue calculation, risk assessment and maintenance optimization, identifies potential risk factors, and formulates scientific and economical maintenance strategies and preventive measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flow chart of a deepwater drilling riser fatigue life management method according to one embodiment of the present invention; Figure 2 2. It is a schematic structural diagram of a watertight pipe according to an embodiment of the present invention; Figure 3 is a schematic structural diagram of an electronic tag according to an embodiment of the present invention; Figure 4 is a schematic diagram of an electronic tag reading module in one embodiment of the present invention; Figure 5 is a schematic diagram of an antenna installation method according to an embodiment of the present invention; Figure 6 is a flow chart of wave-induced fatigue and vortex-induced fatigue analysis in one embodiment of the present invention; Figure 7 4 is a flow chart of risk assessment and maintenance optimization in one embodiment of the present invention.

[0018] Reference numerals: 1-Riser; 2-Auxiliary pipeline; 3-Buoyancy block; 4-Electronic tag; 5-Guide frame; 6-Base plate; 7-Casing; 8-Screws. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail through specific embodiments. However, it should be understood that the specific embodiments are provided only for a better understanding of the present invention and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms used are for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] Deepwater drilling riser fatigue life management, a series of data recording, fatigue assessment, risk evaluation, and inspection and maintenance processes aimed at ensuring the riser's safe and reliable service life, is a key development direction for deepwater oil and gas drilling technology and a key measure to ensure the safe operation of the riser. By implementing riser fatigue life management and assessing the riser's fatigue, potential risks in complex marine environments can be effectively identified and eliminated, reducing the probability of accidents, ensuring the structural and functional integrity of the riser, and improving its reliability, thus meeting the safe operational requirements of deepwater oil and gas development.

[0021] Although there have been preliminary reports on the research on fatigue life management of deepwater drilling risers 1, and some related supporting technologies have been formed, the existing methods still have many shortcomings, such as poor professionalism, low degree of digitization, lack of data accuracy and other problems, which bring significant safety hazards to the operation of risers 1. In order to solve the above problems, the present invention provides a deepwater drilling riser 1 fatigue life management method and system. By performing basic data collection and management, fatigue damage calculation, risk assessment, maintenance optimization and maintenance plan planning on deepwater drilling risers 1, a deepwater drilling riser 1 fatigue life management method and system are constructed, thereby preventing the occurrence of deepwater drilling riser 1 accidents, achieving comprehensive monitoring and management of drilling risers 1, and effectively preventing and reducing the occurrence of drilling riser 1 accidents. The following is a detailed description of the present invention through examples in conjunction with the accompanying drawings.

[0022] Example 1 This embodiment discloses a fatigue life management method for a deepwater drilling riser 1. Figure 1 As shown, the following steps are included: S1 obtains the configuration information and structural parameter information of the watertight pipe 1 by reading the electronic tag 4 of the watertight pipe 1.

[0023] The riser 1 is subject to environmental loads such as wave loads, current loads, drilling platform movement, soil resistance, etc. in deep water environments, which will produce complex dynamic responses and stress changes, leading to material fatigue damage. It is a part of the offshore drilling system that is prone to failure. Figure 2 As shown, the riser system includes a riser 1, buoyancy blocks 3, several auxiliary pipelines 2, and a guide frame 5. The riser 1 is fixed to the buoyancy blocks 3. The buoyancy blocks 3 are also equipped with several auxiliary pipelines 2 to ensure the normal circulation of drilling fluid and the safe operation of the well control system. The auxiliary pipelines 2 include throttling and well-killing pipelines, drilling fluid boosting pipelines, hydraulic pipelines, etc., which are arranged around the riser 1. The buoyancy blocks 3 and other components have the functions of reducing the wet weight of the riser 1, reducing vortex-induced vibration, providing insulation, and protecting the riser 1. Although modifying the buoyancy blocks 3 has little impact on the reliability of the riser 1, they are not suitable for installing electronic tags 4. If electronic tags 4 are installed on them, they will protrude from the maximum outer diameter of the riser 1 system. During the process of lowering and recovering the riser 1 system, interference with external components is likely to occur, resulting in the loss and failure of the electronic tags 4.

[0024] The guide frame 5 is mounted on the watertight pipe 1 to support and guide the watertight pipe 1, ensuring its directional stability and safety during lowering and recovery. Small-scale, low-level modifications to the guide frame 5 will not affect the overall reliability of the watertight pipe 1 system. Therefore, in this embodiment, an electronic tag 4 is mounted on the guide frame 5, specifically on the outside of the portion of the guide frame 5 at the lower end that constrains the watertight pipe 1. If the electronic tag 4 is installed before the guide frame 5 is assembled, it should be installed away from the assembly path and the location of the mounting nut during installation to avoid interference during assembly. If the electronic tag 4 is installed after the guide frame 5 is assembled, it should be installed away from the location of the mounting nut. By identifying the watertight pipe 1 with the electronic tag 4, record tracking is used to generate configuration information and structural parameter information for the watertight pipe 1.

[0025] When designing the structure of the electronic tag 4, the following factors that affect the reliability of the electronic tag 4 should be considered: Since the working environment of the watertight pipe 1 is deep sea, the electronic tag 4 is exposed to seawater for a long time and is prone to electrochemical corrosion; the electronic tag 4 is exposed to high pressure for a long time and is prone to crush failure; since the working environment of the watertight pipe 1 is harsh and the environmental load is complex, the electronic tag 4 is inevitably prone to unexpected failure. In order to avoid the above failure situations, the structure of the electronic tag 4 in this embodiment is as follows: Figure 3As shown, the electronic tag 4 includes an identification unit, a base plate 6, a shell 7 and screws 8; the base plate 6 is fixedly connected to the guide frame 5. In this embodiment, the fixed connection method is welding. The welding quality requirements include no defects in appearance, qualified internal non-destructive testing, welding deformation controlled within the allowable range, and strict compliance with the welding process and record inspection process to ensure the safety and reliability of the welded structure. However, other fixed connection methods other than welding can also be used. The identification unit is set between the base plate 6 and the shell 7, and the shell 7 fixes the identification unit to the base plate 6 through screws 8. The shell 7 is made of stainless steel to meet the high pressure of the deep-water environment and reduce electrochemical corrosion. The base plate 6 is made of the same material as the identification unit. When impure metal materials come into contact with electrolyte solutions, a primary battery reaction will occur. Therefore, the base plate 6 is made of the same stainless steel material to avoid seawater corrosion while also effectively slowing down electrochemical corrosion. The base plate 6 is provided with a groove that matches the shape of the bottom of the identification unit. The groove is provided with a threaded hole connecting the base plate 6 and the identification unit. The base plate 6 and the identification unit are connected by screws 8 to ensure the stability of the overall structure, which can be easily replaced, maintained and upgraded.

[0026] If the identification unit is damaged, it should be removed from the base plate 6 and a new identification unit should be installed on the base plate 6. Before installing the new identification unit, the watertight pipe identity information of the identification unit should be re-bound in the database.

[0027] like Figure 4 As shown, the electronic tag 4 is read by an RFID device, which includes a fixed RFID device and a handheld RFID device. Both the fixed RFID device and the handheld RFID device read the electronic tag 4 simultaneously. The fixed RFID device is connected to an antenna to read the electronic tag 4. The electronic tag 4 is wirelessly connected to the antenna through electromagnetic induction. The antenna receives the identity information of the watertight pipe 1 and transmits this information to the fixed RFID device via a wired connection using a TNC (Threaded Neill-Concelman) interface. A wireless network is connected to the fixed RFID device. The fixed RFID device transmits the read data to a mobile workstation via the wireless network. The handheld RFID device assists in reading the electronic tag 4, without the need for an external antenna and can directly read the electronic tag 4. The handheld RFID device also transmits the read data to the mobile workstation via the wireless network, and reads the configuration information and structural parameters of the watertight pipe 1 from the mobile workstation. The fixed RFID device and the wireless network are connected via a network port, while the handheld RFID device and the wireless network are connected via a local area network. The mobile workstation is connected to the wireless network via a local area network, thereby enabling the transmission and sharing of the watertight pipe 1 identity information in the electronic tag 4.

[0028] The mobile workstation is the terminal for the flow of riser identity information data. The mobile workstation includes an information visualization unit and a riser data management unit. The information visualization unit is used to display riser 1 configuration information and structural parameter information, comprehensive fatigue damage and service life, risk assessment and maintenance optimization results, and can interact with users to achieve data addition, deletion, modification and query. It can serve as a window for data addition, deletion, modification and query in the riser data management unit database. The riser data management unit summarizes and stores data related to the calculation and operation of the entire system, including but not limited to riser 1 configuration information and structural parameter information, comprehensive fatigue damage and service life, risk assessment and maintenance optimization results. The riser data management unit includes multiple databases, including but not limited to a drilling riser system configuration information database, a single riser structure information database, a riser lowering and recovery record database, a single riser fatigue damage record database, a single riser risk level record database, and a single riser maintenance record database.

[0029] When designing the antenna layout plan, the following factors that affect the reading efficiency of the electronic tag 4 should be considered: Due to the independence of the identification code of the electronic tag 4, the identity information of the watertight pipe 1 and the identification code of the electronic tag 4 need to correspond to each other; when the watertight pipe 1 is lowered and recovered, the directions of different watertight pipes 1 are not uniform, and the installation positions of the electronic tag 4 are not uniform; when installing the electronic tag 4, the modification of the watertight pipe 1 structure should be minimized, and the number of electronic tags 4 installed on the watertight pipe 1 is generally one. Taking all the above factors into consideration, the antenna layout is as follows: Figure 5 In the manner shown, the antenna and the RFID device are arranged on the moon pool plane of the drilling platform. In order to ensure the success rate of reading the electronic tag 4, an antenna is installed in four directions of the moon pool of the offshore drilling platform respectively. The antenna is connected to the four communication channels of a fixed RFID device through the TNC interface to transmit the RFID signal of the fixed RFID device and receive the feedback signal of the electronic tag 4.

[0030] The mobile workstation must filter different channels to simultaneously read the same electronic tag 4 identification code. Data from electronic tags 4 read by handheld RFID devices must be filtered out of those already captured by fixed RFID devices. This arrangement significantly improves the reliability of electronic tag 4 reading. With only one electronic tag 4 installed on a single riser 1, the signal reception range of the four antennas fully covers the space in the drilling platform's moonpool where the riser 1 is lowered and recovered. This embodiment improves the accuracy of electronic tag 4 reading even when the specific orientation of the riser 1 on which the electronic tag 4 is installed is unknown.

[0031] During the lowering process of the watertight pipe 1, the radio frequency identification device automatically reads the electronic tag 4 installed on the watertight pipe 1; the read identity information of the watertight pipe 1 enters the mobile workstation through the wireless network; in the mobile workstation, the identity information of the watertight pipe 1 is matched with the information in the database, and the identity information of the watertight pipe 1 and the corresponding operation information and structural information of the watertight pipe 1 are displayed; the above steps are repeated in sequence to record the identity information of the watertight pipe 1 and obtain the lowering order of the watertight pipe 1, and on this basis, the configuration information of the watertight pipe 1 is obtained, and the configuration information will be automatically recorded in the database of the mobile workstation.

[0032] S2 performs wave-induced fatigue and vortex-induced fatigue analysis based on the configuration information and structural parameter information of the watertight pipe 1, thereby predicting the comprehensive fatigue damage and service life of the watertight pipe 1.

[0033] like Figure 6 As shown, the wave-induced fatigue and vortex-induced fatigue analysis methods are as follows: the configuration information, structural parameter information and stress cycle data of the riser 1 are recorded, and the environmental load and calculation parameter information are input to obtain the stress-life curve; in the wave-induced fatigue analysis, a dynamic model of the deepwater drilling riser 1 coupled system is established, and parameters are set to apply environmental loads and boundary constraints. The fatigue stress of the riser 1 is statistically calculated using the rain flow counting method, and the fatigue damage of the riser 1 is calculated based on the stress-life curve; then, based on the linear fatigue damage accumulation criterion, the long-term wave-induced fatigue damage is calculated based on the fatigue damage of the riser 1; In the vortex-induced fatigue analysis, a modal analysis equation is established to solve key parameters such as the modal frequency and modal vibration shape of the watertight pipe 1; based on the key parameters such as the modal frequency and modal vibration shape of the watertight pipe 1, the vortex-induced resonance response mode is identified, the fatigue stress under the corresponding mode is calculated, and then the vortex-induced fatigue damage of the watertight pipe 1 is calculated based on the stress-life curve.

[0034] Combining the fatigue damage occupancy rate under different operation modes and the Miner fatigue damage accumulation criterion, a comprehensive fatigue damage assessment of the riser 1 system was conducted, and the fatigue life was calculated based on the assessment results.

[0035] S3 conducts risk assessment based on the analysis results of wave-induced fatigue and vortex-induced fatigue.

[0036] like Figure 7 As shown, the method for risk assessment is: based on the results of wave-induced fatigue and vortex-induced fatigue analysis, the failure probability and failure consequences of the deepwater drilling riser 1 are obtained, the failure probability and failure consequences of the deepwater drilling riser 1 are quantitatively evaluated, a risk matrix is ​​generated, and a risk assessment level is generated according to the risk matrix.

[0037] The method for generating a risk matrix is ​​as follows: A fatigue reliability analysis model for a single riser 1 is established, random variables influencing the failure of riser 1 are defined, and reliability calculations are performed using the Monte Carlo method to determine the fatigue failure probability of riser 1. The fatigue reliability analysis model for a single riser 1 is optimized, and the random variables are updated to obtain the fatigue failure probability, which is then classified into six levels in this embodiment. Failure consequences are determined from the perspectives of safety, environment, and economy, and classified into several levels. In this embodiment, these are defined as five levels: A, B, C, D, and E. The fatigue failure probability levels and failure consequence levels are combined to generate a risk matrix. Finally, the risk assessment results are displayed in the risk matrix based on the failure probability calculation results and the selected failure consequences.

[0038] S4 performs maintenance optimization based on the risk assessment results. For high-risk items, maintenance is directly carried out. For medium and low-risk items, the total process cost is calculated based on the defect type of watertight pipe 1. The genetic algorithm is used to optimize the maintenance method. With the lowest process usage cost as the objective function, adaptive optimization is performed to obtain the most economical maintenance plan for watertight pipe 1.

[0039] The risk assessment module determines whether riser 1 requires inspection and repair based on its analysis results. The repair plan for riser 1 is optimized based on the principle of minimum cost, ensuring that the risk of riser 1 is at an acceptable level.

[0040] For a single riser 1 located in the high-risk area of ​​the risk matrix, it should be directly inspected and tested, and then the risk assessment should be carried out. Finally, the risk level evaluation and inspection and repair process should be recorded in the riser 1 data management module.

[0041] The single riser 1 with risk assessment in the low and medium areas of the risk matrix should be inspected and the optimal maintenance plan should be analyzed using the maintenance optimization module. Finally, the risk level, inspection record and maintenance plan should be recorded in the riser 1 data management module.

[0042] The method for obtaining the most economical maintenance plan for riser 1 is as follows: a total cost model for riser 1 is defined, which includes inspection costs, maintenance costs, and failure costs. Combined with parameters such as riser 1's service life, maximum failure probability, minimum inspection interval, and bank interest rate, a genetic algorithm is used to automatically search and guide the optimization search space. The objective function is the lowest process usage cost. If the objective function is met, the optimal maintenance plan is generated. If not, the genetic algorithm generates a new population and performs adaptive optimization of the total cost model until the objective function is met, thereby achieving the global optimal maintenance plan for riser 1. This minimizes the costs of the maintenance and management process while meeting risk requirements. Based on the maintenance optimization plan and actual inspection and maintenance records, the reliability of riser 1 is updated, and the risk assessment is re-performed, recording the updated risk level of riser 1.

[0043] Example 2 Based on the same inventive concept, this embodiment discloses a fatigue life management system for a deepwater drilling riser 1, comprising: An electronic tag 4 reading module is used to obtain configuration information and structural parameter information of the watertight pipe 1 by reading the electronic tag 4 of the watertight pipe 1; A fatigue calculation module is used to perform wave-induced fatigue and vortex-induced fatigue analysis based on the configuration information and structural parameter information of the riser 1, thereby predicting the comprehensive fatigue damage and service life of the riser 1; Risk assessment module, used to conduct risk assessment based on the results of wave-induced fatigue and vortex-induced fatigue analysis; The maintenance optimization module is used to perform maintenance optimization based on the results of risk assessment. For high-risk items, maintenance is directly carried out. For medium and low-risk items, the total process cost is calculated based on the defect type of watertight pipe 1. The genetic algorithm is used to optimize the maintenance method. With the lowest process usage cost as the objective function, adaptive optimization is performed to obtain the most economical maintenance plan for watertight pipe 1.

[0044] Embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0045] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0046] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0047] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be included within the scope of protection of the claims of the present invention. The above content is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art who can easily think of changes or replacements within the technical scope disclosed by the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for managing fatigue life of deepwater drilling riser, characterized in that: The following steps are involved: Obtain riser configuration information and structural parameter information by reading the electronic tag of the riser; performing wave-induced fatigue and vortex-induced fatigue analysis based on the riser configuration information and structural parameter information, thereby predicting the comprehensive fatigue damage and service life of the riser; Conduct risk assessment based on the wave-induced fatigue and vortex-induced fatigue analysis results; According to the results of the risk assessment, maintenance optimization is carried out. For high-risk items, maintenance is carried out directly. For medium and low-risk items, the total process cost is calculated based on the defect type of the watertight pipe. The genetic algorithm is used to optimize the maintenance method. With the lowest process usage cost as the objective function, adaptive optimization is carried out to obtain the most economical maintenance plan for the watertight pipe.

2. The deepwater drilling riser fatigue life management method according to claim 1, characterized in that: The watertight pipe system includes a watertight pipe, a buoyancy block, several auxiliary pipelines and a guide frame. The watertight pipe is fixed on the buoyancy block. Several auxiliary pipelines are provided on the buoyancy block to ensure the normal circulation of drilling fluid and the safe operation of the well control system; the guide frame is mounted on the watertight pipe to support and guide the watertight pipe; the electronic tag is set on the guide frame.

3. The deepwater drilling riser fatigue life management method according to claim 2, characterized in that: The electronic tag includes an identity recognition unit, a base plate, a shell and screws; the base plate is fixedly connected to the guide frame, the identity recognition unit is arranged between the base plate and the shell, and the shell fixes the identity recognition unit to the base plate through the screws.

4. The deepwater drilling riser fatigue life management method according to claim 3, characterized in that: The electronic tag is read by a radio frequency identification device, which includes a fixed radio frequency identification device and a handheld radio frequency identification device; the fixed radio frequency identification device and the handheld radio frequency identification device read the electronic tag at the same time; the fixed radio frequency identification device is connected to an antenna; the radio frequency identification device transmits the read data to a mobile workstation through a wireless network, and reads the watertight pipe configuration information and structural parameter information from the mobile workstation.

5. The deepwater drilling riser fatigue life management method according to claim 4, characterized in that: The mobile workstation includes an information visualization unit and a watertight pipe data management unit. The information visualization unit is used to display the watertight pipe configuration information and structural parameter information, comprehensive fatigue damage and service life, risk assessment results and maintenance optimization results, and can interact with users to realize data addition, deletion, modification and query; the watertight pipe data management unit summarizes the watertight pipe configuration information and structural parameter information, comprehensive fatigue damage and service life, risk assessment results and maintenance optimization results, and stores them.

6. The deepwater drilling riser fatigue life management method according to claim 1, characterized in that: The wave-induced fatigue and vortex-induced fatigue analysis methods are as follows: recording the stress cycle data of the watertight pipe to obtain the stress-life curve; in the wave-induced fatigue analysis, the fatigue stress of the watertight pipe is statistically analyzed using the rain flow counting method, and the fatigue damage of the watertight pipe is calculated based on the stress-life curve; then, based on the linear fatigue damage accumulation criterion, the long-term wave-induced fatigue damage is calculated based on the fatigue damage of the watertight pipe; in the vortex-induced fatigue analysis, the vortex-induced resonance response mode is identified based on the modal frequency and modal vibration shape of the watertight pipe, and then the vortex-induced fatigue damage of the watertight pipe is calculated based on the stress-life curve; combined with the fatigue damage occupancy rate under different operating modes and the Miner fatigue damage accumulation criterion, a comprehensive fatigue damage assessment is performed on the watertight pipe system, and the fatigue life is calculated based on the assessment results.

7. The deepwater drilling riser fatigue life management method according to claim 1 or 6, characterized in that: The method for risk assessment is: based on the results of wave-induced fatigue and vortex-induced fatigue analysis, the failure probability and failure consequences of the deep-water drilling riser are obtained, the failure probability and failure consequences of the deep-water drilling riser are quantitatively evaluated, a risk matrix is ​​generated, and a risk assessment level is generated based on the risk matrix.

8. The deepwater drilling riser fatigue life management method according to claim 7, characterized in that: The method for generating the risk matrix is: By establishing a single riser fatigue reliability analysis model, random variables that affect riser failure are defined, and the Monte Carlo method is used to optimize the single riser fatigue reliability analysis model to update the random variables, obtain fatigue failure probability, and divide it into several levels; determine the failure consequences from three aspects: safety, environment and economy, and divide the failure consequences into several levels; and generate a risk matrix by combining the fatigue failure probability level and the failure consequence level.

9. The deepwater drilling riser fatigue life management method according to claim 1, characterized in that: The method for obtaining the most economical maintenance plan for the watertight pipe is as follows: defining a total cost model for the watertight pipe, the total cost model including inspection costs, maintenance costs and failure costs, combining the service time of the watertight pipe, the maximum failure probability, the minimum inspection interval and the bank interest rate, using a genetic algorithm to optimize the inspection method, with the lowest process usage cost as the objective function, if the objective function is met, the optimal maintenance plan is generated, if not, the genetic algorithm is used to generate a new population, and the total cost model is adaptively optimized until the objective function is met.

10. A deepwater drilling riser fatigue life management system, characterized in that: include: An electronic tag reading module is used to obtain riser configuration information and structural parameter information by reading the electronic tag of the riser; a fatigue calculation module for performing wave-induced fatigue and vortex-induced fatigue analysis based on the riser configuration information and structural parameter information, thereby predicting the comprehensive fatigue damage and service life of the riser; A risk assessment module, configured to perform risk assessment based on the wave-induced fatigue and vortex-induced fatigue analysis results; The maintenance optimization module is used to perform maintenance optimization based on the results of the risk assessment. For high-risk items, maintenance is directly performed. For medium and low-risk items, the total process cost is calculated based on the defect type of the watertight pipe. The maintenance method is optimized using a genetic algorithm. With the lowest process usage cost as the objective function, adaptive optimization is performed to obtain the most economical maintenance plan for the watertight pipe.

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