A method, system and apparatus for designing and analyzing a marine riser and subsea wellhead system

Abstract

The application relates to a marine riser and subsea wellhead system design analysis method, system and device, which comprises a database module, a system design and optimization module, a top tension design and optimization module, a strength evaluation module, an operation window analysis module, a one-key design and analysis module and a report generation module. Basic data in the database module is used to complete configuration design and top tension design of the marine riser and subsea wellhead system; based on the design results, strength evaluation and operation window analysis of the marine riser and subsea wellhead system under installation and recovery modes, connection modes and suspension modes are carried out to obtain structural strength of the marine riser, stability of the subsea wellhead and operation warning limits; and a design analysis report of the marine riser and subsea wellhead system is generated based on comprehensive design analysis results. The application has the characteristics of design specification, comprehensive function and convenient use, and can provide technical support for deepwater oil and gas safe exploration and development.

Description

Technical Field

[0001] This invention belongs to the field of offshore oil and gas development, specifically relating to a design and analysis method, system, and device for offshore riser and subsea wellhead systems. Background Technology

[0002] Offshore oil and gas resources are abundant, making it a crucial area for oil and gas exploration and development for many countries. Offshore risers and subsea wellhead systems are key equipment in offshore oil and gas exploration and development, operating for extended periods in complex, variable, and harsh marine environments. Under the influence of waves, currents, and other loads, these systems experience complex dynamic responses. Over long periods of service, numerous failures of offshore riser systems due to inadequate design and analysis have resulted in significant economic losses. Therefore, the design and dynamic response analysis of offshore risers and subsea wellhead systems are critical tasks for their operational application.

[0003] Marine riser and subsea wellhead systems are long-scale complex systems composed of numerous and varied individual structures. The system design process is cumbersome and prone to errors. Conventional analysis types include static / dynamic analyses of marine riser and subsea wellhead systems under connection, suspension, and installation / recovery modes, as well as operational window analyses under these three modes. Analysis results include parameters such as stress, bending moment, and tension. Therefore, marine riser and subsea wellhead systems are characterized by system complexity, design difficulties, multiple analysis modes, and diverse result types. To ensure the safe and reliable operation of marine riser and subsea wellhead systems, extensive and comprehensive design and analysis work is required, placing a heavy burden on engineers and researchers. Therefore, there is an urgent need to propose a design and analysis method, system, and device for marine riser and subsea wellhead systems to achieve standardization, systematization, and convenience in their design and analysis. Summary of the Invention

[0004] To address the aforementioned problems and in light of the practical needs of offshore oil and gas exploration and development, this invention provides a method, system, and apparatus for designing and analyzing offshore riser and subsea wellhead systems. This method, system, and apparatus enable rapid structural configuration and top tension design of offshore riser and wellhead systems. Based on the design results, an integrated analysis of the structural strength and operating window of the offshore riser and wellhead system is performed, ultimately generating a design and analysis report for the offshore riser and wellhead system. This reduces the workload of engineers and researchers while enhancing the scientific rigor and comprehensiveness of the design and analysis of offshore riser and wellhead systems, providing technical support for offshore oil and gas development.

[0005] The present invention is achieved through the following technical solution: characterized by a design and analysis method, system and device for marine riser and subsea wellhead system, including a database module, a system design and optimization module, a top tension design and optimization module, a strength assessment module, an operation window analysis module, a one-click design and analysis module, and a report generation module.

[0006] The database module includes platform data, marine riser system data, subsea wellhead and shallow wellbore data, and environmental data. It supports users in adding, deleting, modifying, and querying data, serving as the basic data for the design and analysis of marine riser systems. It also supports users in defining basic design and analysis parameters.

[0007] The system design and optimization module receives data from the database module and intelligently designs the structural configuration of the marine riser and subsea wellhead system based on the input water depth and silt discharge height. The design rules are as follows:

[0008] S201: Determine whether to equip the marine riser with an injection valve based on the outer diameter, wall thickness, and material grade of the marine riser in the database module;

[0009] S202: Total length of the designed marine riser system = water depth + distance between the drilling platform and the water surface - distance from the splitter to the drilling platform;

[0010] S203: Total length of marine riser system accessories = Diverter length + Upper flexible joint length + Adaptor short section length + Expansion joint length + Injection valve length (determine whether it is needed according to step S201) + Lower flexible joint / LMRP length + BOP length + Subsea wellhead length;

[0011] S204: The required length of the marine riser system = total length of the marine riser system - total length of the marine riser system's auxiliary components;

[0012] S205: The top of the marine riser system is equipped with two bare marine riser tubes by default. The type and number of buoyancy tubes are selected according to the water depth and the application range of the marine riser. Finally, the length of the expansion joint is adjusted to form the structural configuration of the marine riser and the subsea wellhead system. The structural configuration includes the model, size parameters, weight parameters and location parameters of the marine riser.

[0013] The top tension design and optimization module automatically designs the top tension based on the structural configuration of the marine riser system generated by the system design and optimization module. The top tension design methods include the bottom residual tension method, the API theory method, and the lowering hook loading method. The default top tension design method is the bottom residual tension method.

[0014] The strength assessment module analyzes the mechanical properties of the marine riser and subsea wellhead system in installation and recovery mode, connection mode, and suspension mode based on the received top tension and the structural configuration of the marine riser and subsea wellhead system. The analysis types include static analysis and dynamic analysis, and the result parameter types include displacement, velocity, acceleration, bending moment, tension, stress, and Mises stress. The result viewing format includes time history curves and envelope lines, and the results intuitively display the stability of the subsea wellhead and the structural strength of the marine riser.

[0015] The operation window analysis module performs operation window analysis on the marine riser and subsea wellhead system in installation and recovery mode, connection mode, and suspension mode based on the received top tension and the structural configuration of the marine riser and subsea wellhead system. The obtained operation window types include static and dynamic operation windows, and the results are displayed as operation warning limit values ​​under different platform offsets, sea surface current velocities, wave heights, platform speeds, and marine riser system suspension lengths.

[0016] The one-click design and analysis module is a functional combination of the top tension design and optimization module, the strength assessment module, and the operation window analysis module. After completing the structural configuration of the marine riser and subsea wellhead system, the user activates the analysis button of the one-click design and analysis module. At this time, the module sequentially completes the top tension design, mechanical property analysis of the installation and recovery mode, mechanical property analysis of the connection mode, mechanical property analysis of the suspension mode, operation window analysis of the installation and recovery mode, operation window analysis of the connection mode, and operation window analysis of the suspension mode. After the calculation is completed, the analysis results can be viewed according to the analysis module type. The result type is consistent with that of a single module.

[0017] The report generation module extracts the calculation and analysis results from each of the modules and generates a design analysis report in the order of the modules. The report content can include a single module or multiple modules, and the report format is not limited to Excel, Word, and PDF.

[0018] When viewing marine risers, tensioners, expansion joints, and flexible joints in the database module, structural schematic diagrams are displayed, with the structural shape and dimensional parameters marked on the diagrams.

[0019] The system design and optimization module also has a manual design function, allowing users to manually input data to design the marine riser and subsea wellhead system. During the design process, the structural type and location of the system configuration are displayed in real-time via visualization. Based on the analysis results from the strength assessment module and the operation window analysis module, the module completes the configuration optimization function for the marine riser and subsea wellhead system. The optimization process is as follows:

[0020] S211: Design the top tension according to the bottom residual tension method of the top tension design and optimization module;

[0021] S212: Determine environmental data, and perform connection mode dynamic characteristic analysis and connection mode operation window analysis based on the received top tension and the structural configuration of the marine riser and subsea wellhead system. In the connection mode dynamic characteristic analysis, the platform offset is set to 2%, 4% and 6% of the water depth.

[0022] S213: Extract the maximum Mises stress of the marine riser, the maximum bending moment of the subsea wellhead, and the maximum Mises stress of the shallow wellbore from the dynamic characteristic analysis results of the connection mode, and extract the operation warning limit value from the operation window analysis results of the connection mode.

[0023] S214: Using the operational early warning limit value as the first preferred indicator, the maximum bending moment at the subsea wellhead as the second preferred indicator, the maximum Mises stress of the marine riser as the third preferred indicator, and the maximum Mises stress of the shallow wellbore as the fourth preferred indicator, the resulting comprehensive preferred indicator Ms is:

[0024]

[0025] In the formula, a0, a1, a2, and a3 are weighting coefficients, and a0 + a1 + a2 + a3 = 1; Dl is the operational warning threshold; WD is the operational water depth; and M... wh M is the maximum underwater wellhead bending moment. wh-ma S is the allowable bending moment at the underwater wellhead. r For the maximum Mises stress of the marine riser, S r-ma S represents the yield stress strength of the marine riser material. wb For the maximum Mises stress in the shallow wellbore, S wb-ma The yield stress strength of shallow wellbore materials;

[0026] S215: Adjust the number and distribution of the single buoyancy support tube and the single bare marine riser tube, and recalculate steps S211 to S214. The calculation ends when the set number of times is reached.

[0027] S216: Select the marine riser and subsea wellhead system configuration with the smallest Ms value as the optimal configuration.

[0028] The top tension optimization process of the top tension design and optimization module is achieved through the following steps:

[0029] S301: For the configuration of marine risers and subsea wellhead systems, design the initial top tension Ft based on the bottom residual tension method of the top tension design and optimization module. intial ;

[0030] S302: Determine environmental data, set platform offsets to 2%, 4%, and 6% of water depth for connection mode dynamic characteristic analysis, and simultaneously perform connection mode operation window analysis.

[0031] S303: Extract the maximum Mises stress of the marine riser, the maximum bending moment of the subsea wellhead, the maximum Mises stress of the shallow wellbore, and the effective tension of the shallow wellbore from the dynamic characteristic analysis results of the connection mode; extract the operation warning limit value from the operation window analysis results of the connection mode.

[0032] S304: Set top tension Ft c The range is 0.8Ft. intial ≤Ft c ≤min[1.3Ft intial F t-ma The optimal top tension is determined based on the bisection method, and the optimal top tension satisfies...

[0033]

[0034] In the formula, Ms is calculated from step S214, F e F represents the maximum effective tension in shallow wellbore. t-ma The maximum tension that the tensioner can provide is min[1.3Ft]. intial F t-ma ] is 1.3Ft intial With F t-ma The minimum value in;

[0035] S305: When ΔFt is satisfied c <ε c When the top tension optimization process ends, ΔFt is given in the formula. c The analysis results are given under two different top tensions, ε c For tolerance.

[0036] All three functional modules of the strength assessment module have parameter sensitivity analysis capabilities. Wave height, period, ocean current data, platform offset, platform speed, platform heading, and suspension length are set as custom variables. These custom variables are freely combined to form a working condition matrix. Based on the working condition matrix, the mechanical characteristics of the marine riser and subsea wellhead system are analyzed, and the comparison results based on the working condition matrix are displayed on the same post-processing image.

[0037] All three functional modules of the operation window analysis module have multi-window analysis capabilities. Wave height, period, ocean current data, platform speed, platform heading, and hanging length are set as custom variables. These custom variables are freely combined to form an operation condition matrix. Based on the operation condition matrix, operation window analysis of marine riser and subsea wellhead systems is carried out.

[0038] The one-click design and analysis module defines only one operating condition, and the input parameters include wave height, period, ocean current data, platform offset, platform speed, platform heading, and suspension length.

[0039] The report generation module includes basic design information, environmental data, structural configuration of the marine riser and subsea wellhead system, top tension data, operating condition matrix table and analysis results. The analysis results include displacement envelope, bending moment envelope, stress envelope and operation window diagram.

[0040] The database module is designed with an independent user interface; the system design and optimization module, top tension design and optimization module, strength assessment module, operation window analysis module, and one-click design and analysis module are all designed with independent user interfaces. The user interface is divided into a data viewing area, a parameter definition area, a calculation and analysis area, a status display area, and a result viewing area. The status display area lists error information, prompts, and progress information in real time during the calculation and analysis process.

[0041] Furthermore, the present invention also provides a design and analysis device for marine risers and subsea wellhead systems, comprising a server consisting of a display, a memory, and a processor. The display is interconnected with the memory and the processor. The processor is used to store program code for the database module, the system design and optimization module, the top tension design and optimization module, the strength assessment module, the operation window analysis module, the one-click design and analysis module, and the report generation module. The memory is used to store basic data in the database module. Users can use the display to operate the user interface to call the processor to perform marine riser and subsea wellhead system design and analysis. The analysis results are stored in the memory. The server has external access permissions and can access the user interface through a link.

[0042] The present invention has achieved the following beneficial effects:

[0043] (1) Design specifications: This invention establishes a structural configuration design and top tension design method for marine riser and subsea wellhead system by combining experience and theory, so as to realize intelligent and rapid design of structural configuration and top tension; at the same time, it fully considers the actual operation conditions and proposes configuration optimization and top tension optimization methods to further standardize the design process and avoid human error.

[0044] (2) Comprehensive functions: This invention covers all supporting functional modules for the design and analysis of marine risers and subsea wellhead systems. It can carry out strength assessment and operation window analysis of marine risers and subsea wellhead systems in installation and recovery mode, connection mode and suspension mode. The analysis results include a variety of mechanical parameters, providing engineers and researchers with a comprehensive design and analysis system.

[0045] (3) Easy to use: This invention integrates database management, system design, operation analysis and report generation functions for marine riser and subsea wellhead systems. The functional modules are logically clear and easy to operate. At the same time, the one-click design and analysis function module has the ability to link all design and analysis modules, reducing the design and analysis process. Attached Figure Description

[0046] Figure 1 A simplified flowchart of the design and analysis process for a marine riser and subsea wellhead system provided in an embodiment of the present invention;

[0047] Figure 2 A simplified flowchart illustrating the configuration optimization process of the marine riser and subsea wellhead system provided in this embodiment of the invention;

[0048] Figure 3 A simplified flowchart of the top tension optimization process for a marine riser and subsea wellhead system provided in an embodiment of the present invention. Detailed Implementation

[0049] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0050] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0051] To clearly illustrate the design and analysis method, system, and apparatus for a marine riser and subsea wellhead system, the following section combines... Figure 1 The relevant content will be explained in detail.

[0052] A design and analysis method, system, and device for marine riser and subsea wellhead systems includes a database module 100, a system design and optimization module 200, a top tension design and optimization module 300, a strength assessment module 400, an operation window analysis module 500, a one-click design and analysis module 600, and a report generation module 700.

[0053] Database module 100 includes platform data, marine riser system data, subsea wellhead and shallow wellbore data, and environmental data. It supports users in adding, deleting, modifying, and querying data, serving as the basic data for the design and analysis of marine riser systems. It also supports users in defining basic design and analysis parameters. When viewing marine risers, tensioners, expansion joints, and flexible joints, structural schematic diagrams are displayed, with structural shape and dimensional parameters marked on the diagrams.

[0054] The system design and optimization module 200 receives data from the database module 100 and intelligently designs the structural configuration of the marine riser and subsea wellhead system based on the input water depth and silt discharge height. It also has a manual design function, allowing manual input of data to design the marine riser and subsea wellhead system. During the design process, the structural type and location of the system configuration are displayed in real-time. The intelligent design rules for the structural configuration of the marine riser and subsea wellhead system are as follows:

[0055] S201: Determine whether to equip the marine riser with an injection valve based on the outer diameter, wall thickness, and material grade of the marine riser in database module 100;

[0056] S202: Total length of the designed marine riser system = water depth + distance between the drilling platform and the water surface - distance from the splitter to the drilling platform;

[0057] S203: Total length of marine riser system accessories = Diverter length + Upper flexible joint length + Adaptor short section length + Expansion joint length + Injection valve length (determine whether it is needed according to step S101) + Lower flexible joint / LMRP length + BOP length + Subsea wellhead length;

[0058] S204: The required length of the marine riser system = total length of the marine riser system - total length of the marine riser system's auxiliary components;

[0059] S205: The top of the marine riser system is equipped with two bare marine riser tubes by default. The type and number of buoyancy tubes are selected according to the water depth and the application range of the marine riser. Finally, the length of the expansion joint is adjusted to form the structural configuration of the marine riser and the subsea wellhead system. The structural configuration includes the model, size parameters, weight parameters and location parameters of the marine riser.

[0060] The top tension design and optimization module 300 automatically designs the top tension based on the structural configuration of the marine riser system generated by the system design and optimization module 200. The top tension design methods include the bottom residual tension method, the API theory method, and the lowering hook loading method. The default top tension design method is the bottom residual tension method.

[0061] The strength assessment module 400 analyzes the mechanical properties of the marine riser and subsea wellhead system under installation and recovery, connection, and suspension modes based on the received top tension and structural configuration of the marine riser and subsea wellhead system. It sets wave height, period, ocean current data, platform offset, platform speed, platform heading, and suspension length as custom variables to conduct parameter sensitivity analysis. These custom variables are freely combined to form a working condition matrix, and the comparison results based on this matrix are displayed on the same post-processing graph. Analysis types include static and dynamic analysis, and result parameter types include displacement, velocity, acceleration, bending moment, tension, stress, and Mises stress. Result viewing formats include time history curves and envelope lines, providing a visual representation of the subsea wellhead stability and the structural strength of the marine riser.

[0062] The operation window analysis module 500 performs operation window analysis on the marine riser and subsea wellhead system in installation and recovery mode, connection mode, and suspension mode based on the received top tension and structural configuration of the marine riser and subsea wellhead system. It sets wave height, period, ocean current data, platform offset, platform speed, platform heading, and suspension length as custom variables to conduct parameter sensitivity analysis. The obtained operation window types include static and dynamic operation windows, and the results are displayed as operation warning limit values ​​under different platform offsets, sea surface current velocities, wave heights, platform speeds, and marine riser system suspension lengths.

[0063] The one-click design and analysis module 600 is a functional combination of the top tension design and optimization module 300, the strength assessment module 400, and the operation window analysis module 500. After completing the structural configuration of the marine riser and subsea wellhead system, the user defines a working condition and inputs parameters including wave height, period, ocean current data, platform offset, platform speed, platform heading, and suspension length. Finally, the user activates the analysis button of the one-click design and analysis module 600. At this time, the module sequentially completes the top tension design, mechanical property analysis of the installation and recovery mode, mechanical property analysis of the connection mode, mechanical property analysis of the suspension mode, operation window analysis of the installation and recovery mode, operation window analysis of the connection mode, and operation window analysis of the suspension mode. After the calculation is completed, the analysis results can be viewed according to the analysis module type.

[0064] The report generation module 700 extracts basic design information, environmental data, structural configuration of marine risers and subsea wellhead systems, top tension data, working condition matrix tables and analysis results from various modules. The analysis results include displacement envelopes, bending moment envelopes, stress envelopes and operation window diagrams. The module generates a design analysis report in the order of modules. The report content can include a single module or multiple modules, and the report format is not limited to Excel, Word and PDF.

[0065] Database module 100 has an independent user interface; system design and optimization module 200, top tension design and optimization module 300, strength assessment module 400, operation window analysis module 500, and one-click design and analysis module 600 all have independent user interfaces. The user interface is divided into a data viewing area, parameter definition area, calculation and analysis area, status display area, and result viewing area. The status display area lists error information, prompts, and progress information in real time during the calculation and analysis process.

[0066] A design and analysis device for marine risers and subsea wellhead systems includes a server consisting of a display, a memory, and a processor. The display is interconnected with the memory and processor. The processor stores program code for a database module 100, a system design and optimization module 200, a top tension design and optimization module 300, a strength assessment module 400, a work window analysis module 500, a one-click design and analysis module 600, and a report generation module 700. The memory stores basic data in the database module 100. Users can operate the user interface through the display to call the processor to perform marine riser and subsea wellhead system design and analysis. The analysis results are stored in the memory. The server has external access permissions and can access the user interface through a link.

[0067] To clearly illustrate the design and analysis method, system, and apparatus for a marine riser and subsea wellhead system, the following section combines... Figure 2 The relevant content will be explained in detail.

[0068] The optimization process for the configuration of marine risers and subsea wellhead systems is as follows:

[0069] S211: Design the top tension according to the bottom residual tension method of the top tension design and optimization module;

[0070] S212: Determine environmental data, and perform connection mode dynamic characteristic analysis and connection mode operation window analysis based on the received top tension and the structural configuration of the marine riser and subsea wellhead system. In the connection mode dynamic characteristic analysis, the platform offset is set to 2%, 4% and 6% of the water depth.

[0071] S213: Extract the maximum Mises stress of the marine riser, the maximum bending moment of the subsea wellhead, and the maximum Mises stress of the shallow wellbore from the dynamic characteristic analysis results of the connection mode, and extract the operation warning limit value from the operation window analysis results of the connection mode.

[0072] S214: Using the operational early warning limit value as the first preferred indicator, the maximum bending moment at the subsea wellhead as the second preferred indicator, the maximum Mises stress of the marine riser as the third preferred indicator, and the maximum Mises stress of the shallow wellbore as the fourth preferred indicator, the resulting comprehensive preferred indicator Ms is:

[0073]

[0074] In the formula, a0, a1, a2, and a3 are weighting coefficients, and a0 + a1 + a2 + a3 = 1; Dl is the operational warning threshold; WD is the operational water depth; and M... wh M is the maximum underwater wellhead bending moment. wh-ma S is the allowable bending moment at the underwater wellhead. r For the maximum Mises stress of the marine riser, S r-ma S represents the yield stress strength of the marine riser material. wb For the maximum Mises stress in the shallow wellbore, S wb-ma The yield stress strength of shallow wellbore materials;

[0075] S215: Adjust the number and distribution of the single buoyancy support tube and the single bare marine riser tube, and recalculate steps S211 to S214. The calculation ends when the set number of times is reached.

[0076] S216: Select the marine riser and subsea wellhead system configuration with the smallest Ms value as the optimal configuration.

[0077] To clearly illustrate the design and analysis method, system, and apparatus for a marine riser and subsea wellhead system, the following section combines... Figure 3 The relevant content will be explained in detail.

[0078] The top tension optimization process is achieved through the following steps:

[0079] S301: For the configuration of marine risers and subsea wellhead systems, design the initial top tension Ft based on the bottom residual tension method of the top tension design and optimization module. intial ;

[0080] S302: Determine environmental data, set platform offsets to 2%, 4%, and 6% of water depth for connection mode dynamic characteristic analysis, and simultaneously perform connection mode operation window analysis.

[0081] S303: Extract the maximum Mises stress of the marine riser, the maximum bending moment of the subsea wellhead, the maximum Mises stress of the shallow wellbore, and the effective tension of the shallow wellbore from the dynamic characteristic analysis results of the connection mode; extract the operation warning limit value from the operation window analysis results of the connection mode.

[0082] S304: Set top tension Ft c The range is 0.8Ft. intial ≤Ft c ≤min[1.3Ft intial F t-maThe optimal top tension is determined based on the bisection method, and the optimal top tension satisfies...

[0083]

[0084] In the formula, Ms is calculated from step S214, F e F represents the maximum effective tension in shallow wellbore. t-ma The maximum tension that the tensioner can provide is min[1.3Ft]. intial F t-ma ] is 1.3Ft intial With F t-ma The minimum value in;

[0085] S305: When ΔFt is satisfied c <ε c When the top tension optimization process ends, ΔFt is given in the formula. c The analysis results are given under two different top tensions, ε c For tolerance.

Claims

1. A design and analysis method, system, and apparatus for marine riser and subsea wellhead systems, characterized in that... include: Database module, system design and optimization module, top tension design and optimization module, strength assessment module, operation window analysis module, one-click design and analysis module, report generation module; The database module includes platform data, marine riser system data, subsea wellhead and shallow wellbore data, and environmental data. It supports users in adding, deleting, modifying, and querying data, serving as the basic data for the design and analysis of marine riser systems. It also supports users in defining basic design and analysis parameters. The system design and optimization module receives data from the database module and intelligently designs the structural configuration of the marine riser and subsea wellhead system based on the input water depth and silt discharge height. The design rules are as follows: S201: Determine whether to equip the marine riser with an injection valve based on the outer diameter, wall thickness, and material grade of the marine riser in the database module; S202: Total length of the designed marine riser system = water depth + distance between the drilling platform and the water surface - distance from the splitter to the drilling platform; S203: Total length of marine riser system accessories = Diverter length + Upper flexible joint length + Adaptor short section length + Expansion joint length + Injection valve length (determine whether it is needed according to step S201) + Lower flexible joint / LMRP length + BOP length + Subsea wellhead length; S204: The required length of the marine riser system = total length of the marine riser system - total length of the marine riser system's auxiliary components; S205: The top of the marine riser system is equipped with two bare marine riser tubes by default. The type and number of buoyancy tubes of the marine riser tubes are selected according to the water depth and the application range of the marine riser tubes. Finally, the length of the expansion joint is adjusted to form the structural configuration of the marine riser tubes and the subsea wellhead system. The structural configuration includes the model, size parameters, weight parameters and location parameters of the marine riser tubes. The top tension design and optimization module automatically designs the top tension based on the structural configuration of the marine riser system generated by the system design and optimization module. The top tension design methods include the bottom residual tension method, the API theory method, and the lowering hook loading method. The default top tension design method is the bottom residual tension method. The strength assessment module analyzes the mechanical properties of the marine riser and subsea wellhead system in installation and recovery mode, connection mode, and suspension mode based on the received top tension and the structural configuration of the marine riser and subsea wellhead system. The analysis types include static analysis and dynamic analysis, and the result parameter types include displacement, velocity, acceleration, bending moment, tension, stress, and Mises stress. The result viewing format includes time history curves and envelope lines, and the results intuitively display the stability of the subsea wellhead and the structural strength of the marine riser. The operation window analysis module performs operation window analysis on the marine riser and subsea wellhead system in installation and recovery mode, connection mode and suspension mode based on the received top tension and the structural configuration of the marine riser and subsea wellhead system. The obtained operation window types include static and dynamic operation windows. The results are displayed as operation warning limit values ​​under different platform offsets, sea surface current velocity, wave height, platform speed and marine riser system suspension length. The one-click design and analysis module is a functional combination of the top tension design and optimization module, the strength assessment module, and the operation window analysis module. After completing the structural configuration of the marine riser and subsea wellhead system, the user activates the analysis button of the one-click design and analysis module. At this time, the module sequentially completes the top tension design, mechanical property analysis of the installation and recovery mode, mechanical property analysis of the connection mode, mechanical property analysis of the suspension mode, operation window analysis of the installation and recovery mode, operation window analysis of the connection mode, and operation window analysis of the suspension mode. After the calculation is completed, the analysis results can be viewed according to the analysis module type. The result type is consistent with that of a single module. The report generation module extracts the calculation and analysis results from each of the modules and generates a design analysis report in the order of the modules. The report content can include a single module or multiple modules, and the report format is not limited to Excel, Word, and PDF.

2. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: When viewing marine risers, tensioners, expansion joints, and flexible joints in the database module, structural schematic diagrams are displayed, with the structural shape and dimensional parameters marked on the diagrams.

3. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: The system design and optimization module also has a manual design function, allowing users to manually input data to design the marine riser and subsea wellhead system. During the design process, the structural type and location of the system configuration are displayed in real-time via visualization. Based on the analysis results from the strength assessment module and the operation window analysis module, the module completes the configuration optimization function for the marine riser and subsea wellhead system. The optimization process is as follows: S211: Design the top tension according to the bottom residual tension method of the top tension design and optimization module; S212: Determine environmental data, and perform connection mode dynamic characteristic analysis and connection mode operation window analysis based on the received top tension and the structural configuration of the marine riser and subsea wellhead system. In the connection mode dynamic characteristic analysis, the platform offset is set to 2%, 4% and 6% of the water depth. S213: Extract the maximum Mises stress of the marine riser, the maximum bending moment of the subsea wellhead, and the maximum Mises stress of the shallow wellbore from the dynamic characteristic analysis results of the connection mode, and extract the operation warning limit value from the operation window analysis results of the connection mode. S214: Using the operational early warning limit value as the first preferred indicator, the maximum bending moment at the subsea wellhead as the second preferred indicator, the maximum Mises stress of the marine riser as the third preferred indicator, and the maximum Mises stress of the shallow wellbore as the fourth preferred indicator, the resulting comprehensive preferred indicator Ms is: In the formula, a0, a1, a2, and a3 are weighting coefficients, and a0 + a1 + a2 + a3 = 1; Dl is the operational warning threshold; WD is the operational water depth; and M... wh M is the maximum underwater wellhead bending moment. wh-ma S is the allowable bending moment at the underwater wellhead. r For the maximum Mises stress of the marine riser, S r-ma S represents the yield stress strength of the marine riser material. wb For the maximum Mises stress in the shallow wellbore, S wb-ma The yield stress strength of shallow wellbore materials; S215: Adjust the number and distribution of the single buoyancy support tube and the single bare marine riser tube, and recalculate steps S211 to S214. The calculation ends when the set number of times is reached. S216: Select the marine riser and subsea wellhead system configuration with the smallest Ms value as the optimal configuration.

4. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: The top tension optimization process of the top tension design and optimization module is achieved through the following steps: S301: For the configuration of marine risers and subsea wellhead systems, design the initial top tension Ft based on the bottom residual tension method of the top tension design and optimization module. intial ; S302: Determine environmental data, set platform offsets to 2%, 4%, and 6% of water depth for connection mode dynamic characteristic analysis, and simultaneously perform connection mode operation window analysis. S303: Extract the maximum Mises stress of the marine riser, the maximum bending moment of the subsea wellhead, the maximum Mises stress of the shallow wellbore, and the effective tension of the shallow wellbore from the dynamic characteristic analysis results of the connection mode; extract the operation warning limit value from the operation window analysis results of the connection mode. S304: Set top tension Ft c The range is 0.8Ft intial ≤Ft c ≤min[1.3Ft intial F t-ma The optimal top tension is determined based on the bisection method, and the optimal top tension satisfies... In the formula, Ms is calculated from step S214, F e F represents the maximum effective tension in shallow wellbore. t-ma The maximum tension that the tensioner can provide is min[1.3Ft]. intial F t-ma ] is 1.3Ft intial With F t-ma The minimum value in; S305: When ΔFt is satisfied c <ε c When the top tension optimization process ends, ΔFt is given in the formula. c The analysis results are given under two different top tensions, ε c For tolerance.

5. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: All three functional modules of the strength assessment module have parameter sensitivity analysis capabilities. Wave height, period, ocean current data, platform offset, platform speed, platform heading, and suspension length are set as custom variables. These custom variables are freely combined to form a working condition matrix. Based on the working condition matrix, the mechanical characteristics of the marine riser and subsea wellhead system are analyzed, and the comparison results based on the working condition matrix are displayed on the same post-processing image.

6. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: All three functional modules of the operation window analysis module have multi-window analysis capabilities. Wave height, period, ocean current data, platform speed, platform heading, and hanging length are set as custom variables. These custom variables are freely combined to form an operation condition matrix. Based on the operation condition matrix, operation window analysis of marine riser and subsea wellhead systems is carried out.

7. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: The one-click design and analysis module defines only one operating condition, and the input parameters include wave height, period, ocean current data, platform offset, platform speed, platform heading, and suspension length.

8. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: The report generation module includes basic design information, environmental data, structural configuration of the marine riser and subsea wellhead system, top tension data, operating condition matrix table and analysis results. The analysis results include displacement envelope, bending moment envelope, stress envelope and operation window diagram.

9. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: The database module is designed with an independent user interface; the system design and optimization module, top tension design and optimization module, strength assessment module, operation window analysis module, and one-click design and analysis module are all designed with independent user interfaces. The user interface is divided into a data viewing area, a parameter definition area, a calculation and analysis area, a status display area, and a result viewing area. The status display area lists error information, prompts, and progress information in real time during the calculation and analysis process.

10. The design and analysis method, system, and apparatus for a marine riser and subsea wellhead system as described in claim 1, characterized in that: The system includes a server comprising a display, a memory, and a processor. The display is interconnected with the memory and the processor. The processor stores the program code for the database module, the system design and optimization module, the top tension design and optimization module, the strength assessment module, the operation window analysis module, the one-click design and analysis module, and the report generation module. The memory stores the basic data in the database module. Users can use the display to operate the user interface and call the processor to perform marine riser and subsea wellhead system design and analysis. The analysis results are stored in the memory. The server has external access permissions and can access the user interface through a link.

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