Optimized methods, systems, equipment, and storage media for improving the deformability of oil and gas pipelines.

Abstract

This invention discloses an optimized method, system, equipment, and storage medium for improving the deformation capacity of oil and gas pipelines, relating to the fields of oil and gas pipeline deformation control technology and safety protection. The method utilizes test data of different circumferential welded joints under specific processes to statistically analyze the transformation temperature distribution of the circumferential welded joints, calculate the probability that the transformation temperature is lower than the pipeline's specified temperature, and propose requirements for welding processes and welding materials to ensure that the fracture mode of the circumferential welded joint is ductile crack propagation failure. Secondly, based on the pipeline's tensile strength test data, it proposes a specified value for the tensile strength of the entire weld seam, and combines the statistical results of the distribution of the tensile strength test data of the entire weld seam to propose requirements and specifications for welding performance to ensure strong matching of the circumferential welded joint. This solves the problem in existing technologies where relying solely on the performance indicators of the pipeline and weld seam cannot strictly control failures caused by fluctuations in pipe material performance, resulting in low deformation capacity and high failure probability in practical applications.

Description

Technical Field

[0001] This invention relates to the field of oil and gas pipeline deformation control technology and safety protection, specifically to an optimized method, system, equipment, and storage medium for improving the deformation capacity of oil and gas pipelines. Background Technology

[0002] Due to the complex terrain at many oil and gas extraction sites, oil and gas pipeline projects often traverse multiple seismic fault zones and high-strain environments, resulting in harsh service conditions and placing higher demands on the pipelines' strain resistance. When a pipeline has poor deformation capacity, it is prone to deformation and fracture failure under environmental loads, which can cause serious accidents and endanger public safety.

[0003] Oil and gas pipelines are connected using circumferential welding to form pipelines. Due to the characteristics of the process, the toughness and deformation capacity of the circumferential weld joint are somewhat inferior to those of the pipeline itself, making it a weak point in pipeline safety. Oil and gas pipeline failure modes can be classified into fracture failure under axial force and deformation failure. If a pipeline fractures, brittle fracture under low stress conditions should be avoided first, which places certain requirements on the toughness of the circumferential weld joint. When the toughness is high, the fracture mode of the circumferential weld joint transforms into ductile crack propagation. At this time, the pipeline can withstand greater axial stress and has better deformation capacity. Besides fracture failure, deformation failure is also a common failure mode for oil and gas pipelines. When the toughness of the pipeline and the circumferential weld is high, the failure mode transforms into plastic instability failure of the pipeline. Plastic instability can occur in either the pipeline or the circumferential weld, depending on the tensile strength between them. When the tensile strength of the pipeline is greater than that of the circumferential weld joint, deformation mainly occurs in the weld, eventually leading to weld failure; when the tensile strength of the weld is greater than that of the pipeline, deformation mainly occurs in the pipeline, and the final failure occurs in the pipeline. With the increasing demand for natural gas, the strength (steel grade) and specifications (diameter and wall thickness) of pipelines are also gradually increasing. During pipeline production, performance fluctuations (toughness and strength) are also gradually increasing, placing higher demands on performance control and specification setting. Current pipeline welding processes only address a portion of the performance requirements for the pipeline and weld, failing to strictly control pipeline failure modes and neglecting the impact of performance fluctuations. Therefore, these pipelines have poor deformation resistance and a high failure probability, failing to meet the deformation capacity requirements of existing pipelines in practical applications. Summary of the Invention

[0004] The purpose of this invention is to address the problem in existing technologies where the performance indicators of pipelines and welds alone cannot strictly control pipeline failure modes, resulting in poor deformation capacity and high failure rate in actual pipeline applications. This invention provides an optimized method, system, equipment, and storage medium to improve the deformation capacity of oil and gas pipelines. This method can effectively reduce the risk of pipeline failure and provide technical support for ensuring the safety of pipeline construction.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This invention provides an optimized method for improving the deformation capacity of oil and gas pipelines, comprising the following steps:

[0007] Obtain experimental data on different ring welded joints under specific processes;

[0008] Based on the test data of different ring weld joints, the transition temperature of each ring weld joint was obtained;

[0009] Based on the transition temperature of each ring weld joint, calculate the probability that the transition temperature is lower than the specified temperature of the pipeline.

[0010] Based on the probability that the transition temperature is lower than the specified temperature of the pipeline, determine whether it is necessary to optimize the welding process and welding materials; if yes, then optimize the welding process and welding materials; if no, proceed to the next step in sequence.

[0011] Obtain pipeline strength test data and full weld strength test data for the above process;

[0012] Calculate the specified value of the tensile strength of the entire weld based on the pipeline strength test data;

[0013] Based on the full weld strength test data and the specified value of the full weld tensile strength, determine whether it is necessary to optimize the welding process and welding materials; if yes, then optimize the welding process and welding materials; otherwise, the optimization is completed.

[0014] Furthermore, the method for obtaining the transition temperature of each ring weld joint based on test data of different ring weld joints is as follows: based on test data of different weld joints, obtain the ductile-brittle transition curve of the Charpy impact test fracture shear area of ​​different ring weld joints under a specific process, and obtain the transition temperature of each ring weld joint from the ductile-brittle transition curve.

[0015] Furthermore, the transition temperature is the temperature corresponding to 75% shear area of ​​the ring weld joint on the ductile-brittle transition curve.

[0016] Furthermore, based on the transition temperatures of each ring weld joint, the method for calculating the probability that the transition temperature is lower than the specified temperature of the pipeline is as follows: statistically analyze the tolerance and mean of the transition temperatures according to the normal distribution function, and calculate the probability that the transition temperature is lower than the specified temperature under the specified temperature of the pipeline.

[0017] Furthermore, based on the probability that the transition temperature is lower than the specified temperature of the pipeline, the method for determining whether the welding process and welding materials need to be optimized is as follows: if the probability that the transition temperature is lower than the specified temperature is less than 95%, then the welding process and welding materials need to be optimized to ensure that the fracture mode is ductile crack propagation failure; if the probability that the transition temperature is lower than the specified temperature is greater than or equal to 95%, then proceed to the next step in sequence.

[0018] Furthermore, based on the pipeline strength test data, the method for calculating the specified value of the tensile strength of the entire weld is as follows: obtain the tensile strength of each pipeline based on the pipe strength test data; statistically calculate the average value and variance of the tensile strength of the pipeline according to the normal distribution function; and determine the specified value of the tensile strength of the entire weld by ensuring that the probability of the specified value of the tensile strength of the entire weld being greater than the tensile strength of the pipeline is 95% based on the distribution of the tensile strength of the pipeline.

[0019] Furthermore, based on the full weld strength test data and the specified value of the full weld tensile strength, the method for determining whether the welding process and welding materials need to be optimized is as follows: Based on the full weld strength test data, obtain the full weld tensile strength of each circumferential weld joint, and statistically calculate the average and variance of the full weld tensile strength according to the normal distribution function; if the probability that the full weld tensile strength is greater than the specified value is less than 95%, then the welding process and welding materials need to be optimized to ensure the strong matching of the circumferential weld joint; if the probability that the full weld tensile strength is greater than or equal to the specified value is greater than or equal to 95%, then the optimization ends.

[0020] A system for improving the deformability of oil and gas pipelines, comprising:

[0021] The first data acquisition module is used to acquire test data of different ring welded joints under specific processes;

[0022] The transition temperature acquisition module is used to acquire the transition temperature of each ring weld joint based on the test data of different ring weld joints;

[0023] The probability calculation module is used to calculate the probability that the transition temperature is lower than the specified temperature of the pipeline, based on the transition temperature of each ring weld joint.

[0024] The first optimization module is used to determine whether the welding process and welding materials need to be optimized based on the probability that the transition temperature is lower than the specified temperature of the pipeline.

[0025] The second data acquisition module is used to acquire the pipeline strength test data and the full weld strength test data of the above process;

[0026] The specified value calculation module is used to calculate the specified value of the tensile strength of the entire weld based on the pipeline strength test data;

[0027] The second optimization module is used to determine whether the welding process and welding materials need to be optimized based on the full weld strength test data and the specified value of the full weld tensile strength.

[0028] A terminal device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the above-described method when executing the computer program.

[0029] A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the above-described method.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention provides an optimized method for improving the deformation capacity of oil and gas pipelines. Based on oil and gas pipeline safety assessment and failure analysis technology, it calculates the transition temperature of each circumferential weld joint using data from tests of different circumferential weld joints under specific processes. Using probabilistic statistics, it optimizes the welding process and welding materials based on the probability that the transition temperature will be lower than the pipeline's specified temperature, ensuring that the fracture mode of the circumferential weld joint is ductile crack propagation failure. This improves the pipeline's deformation capacity in practical applications and reduces the failure rate. Secondly, by setting requirements for the tensile strength of the steel pipe, it uses probabilistic statistics to calculate the specified value of the tensile strength of the entire weld. Based on the full weld strength test data and the specified value of the full weld tensile strength, it determines whether the welding process and welding materials need optimization to ensure strong matching of the circumferential weld joint, reducing the risk of low-stress brittle fracture of the pipeline. This further avoids the shortcomings of the original standard, which suffers from poor pipeline deformation capacity due to the inability to control failure modes. This method increases the probability of deformation occurring on the steel pipe under external loads, thereby improving the pipeline's deformation capacity and significantly reducing the risk of oil and gas pipeline failure due to insufficient deformation capacity, thus ensuring pipeline safety and possessing significant economic and social value.

[0032] This invention provides a system for improving the deformation capacity of oil and gas pipelines. This system, through the configuration of a first data acquisition module, a transition temperature acquisition module, a probability calculation module, a first optimization module, a second data acquisition module, a specified value calculation module, and a second optimization module, achieves the acquisition of data from tests on different ring welded joints under the same process, calculation of transition temperatures, probability statistics, optimization suggestions, specified value calculation, and further optimization suggestions. The system has a simple structure, is easy to operate, and can greatly improve optimization efficiency, providing an effective basis for ensuring the safety of oil and gas pipeline construction. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a flowchart of the optimized method for improving the deformation capacity of oil and gas pipelines according to the present invention.

[0035] Figure 2 This is a system structure diagram of the present invention for improving the deformation capacity of oil and gas pipelines.

[0036] Figure 3 This is a schematic diagram illustrating the determination of the ductile-brittle transition temperature in an embodiment of the present invention.

[0037] Figure 4 This is a normal distribution diagram of the ductile-brittle transition temperature in an embodiment of the present invention.

[0038] Figure 5 This is a normal distribution diagram of the tensile strength of the steel pipe in an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] 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.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0045] The present invention will now be described in further detail with reference to the accompanying drawings:

[0046] See Figure 1 This invention provides an optimization method for improving the deformation capacity of oil and gas pipelines. Taking the optimization method for improving the deformation capacity of L485 high-strain marine pipeline as an example, the method includes the following steps:

[0047] Obtain test data of different ring welded joints under specific processes: Obtain test data of different ring welded joints under the automatic welding process of L485 high strain marine pipe.

[0048] See Figure 3 Based on test data of different ring weld joints, the transition temperature of each ring weld joint was obtained. Based on test data of different ring weld joints under the automatic welding process of high-strain marine pipelines for L485, the shear area values ​​of Charpy impact tests at different temperatures (low temperature to room temperature) for different ring weld joints under this process were obtained. Temperature transition curves were plotted, and the temperature corresponding to 75% of the shear area was obtained. This temperature is the ductile-brittle transition temperature of the Charpy impact test, referred to as the transition temperature. Through numerous effective semi-gas physical tests, it was found that the temperature corresponding to the ductile-brittle transition of the fracture surface during pipeline crack propagation corresponds to the shear area of ​​the Charpy impact test. When the shear area is higher than 75%, ductile fracture is guaranteed; when it is lower than 75%, brittle fracture is guaranteed.

[0049] See Figure 4 Based on the transition temperatures of each welded joint, calculate the probability that the transition temperature will be lower than the specified pipeline temperature: For the transition temperatures of each welded joint in the L485 pipeline, the mean transition temperature is -35℃ and the variance is 7℃, calculated using a normal distribution function. According to the pipeline design requirement (-5℃), the specified temperature is -20℃. Calculate the probability that the transition temperature will be lower than the specified temperature of -20℃.

[0050] Based on the probability that the transition temperature is lower than the specified pipeline temperature, determine whether the welding process and welding materials need optimization. If yes, optimize the welding process and welding materials; otherwise, proceed to the next step. If the probability that the transition temperature is lower than the specified temperature is less than 95%, then the welding process and welding materials need to be optimized to ensure that the fracture mode is ductile crack propagation failure. Calculations show that the probability of the transition temperature being lower than the specified temperature by -20℃ is 98.4%. Therefore, it can be known that if the circumferential weld joint of the pipeline fails during service under this process, there is a 98.4% chance of ductile crack propagation failure. Thus, it is considered that the L485 pipeline under this process can guarantee that the fracture mode is ductile crack propagation failure, and proceed to the next step.

[0051] Obtain pipeline strength test data and full weld strength test data for the above process: Obtain pipeline strength test data and full weld strength test data for L485 pipeline under the high strain marine pipeline automatic welding process.

[0052] See Figure 5 Based on the pipeline strength test data, the specified value of the tensile strength of the entire weld is calculated: The tensile strength of the L485 pipeline under the high-strain marine pipeline automatic welding process is obtained from the pipeline strength test data; the average tensile strength of the L485 pipeline is calculated to be 625 MPa with a variance of 30 MPa according to the normal distribution function; based on the distribution of the pipeline's tensile strength, the specified value of the tensile strength of the entire weld is determined; that is, the probability that the specified value of the tensile strength of the entire weld is greater than the pipeline's tensile strength is 95%. Given that the average tensile strength of the L485 pipeline is 625 MPa and the variance is 30 MPa, the specified value of the tensile strength of the entire weld can be calculated to be 675 MPa.

[0053] Based on the full weld strength test data and the specified value of the full weld tensile strength, determine whether the welding process and welding materials need optimization; if yes, optimize the welding process and welding materials; otherwise, the optimization ends. Based on the full weld strength test data, obtain the tensile strength of each full weld; calculate the average and variance of the full weld tensile strength according to the normal distribution function; if the probability that the full weld tensile strength is greater than the specified value is less than 95%, then the welding process and welding materials need optimization; if the probability that the full weld tensile strength is greater than or equal to the specified value is greater than or equal to 95%, then the optimization ends. Based on the pipe strength test data, obtain the full weld tensile strength under the high-strain marine pipe automatic welding process; calculate the average value of the full weld tensile strength according to the normal distribution function as 765 MPa, with a variance of 50 MPa; calculate the probability that the full weld tensile strength is greater than the specified value as 96.4%, which is greater than 95%. This shows that the weld performance under this process can ensure a strong match in the circumferential weld joint, and no further process optimization is needed.

[0054] Therefore, it can be seen that ensuring the fracture mode of the ring weld joint is ductile crack propagation failure and ensuring the ring weld joint is strongly matched can ensure that the failure mode of L485 high strain marine pipe under axial force is ductile crack failure (when there is a defect) or plastic deformation failure (when there is no defect, and the deformation is mainly concentrated on the steel pipe), thereby improving the deformation resistance of the pipeline and meeting the service requirements under working conditions.

[0055] See Figure 2 The present invention provides a system for improving the deformation capacity of oil and gas pipelines, comprising:

[0056] The first data acquisition module is used to acquire test data of different circumferential welded joints under the automatic welding process of high strain marine pipe for L485 pipelines.

[0057] The transition temperature acquisition module is used to acquire the transition temperature of each ring weld joint based on the test data of different ring weld joints under the automatic welding process of L485 pipeline high strain marine pipe.

[0058] The probability calculation module is used to calculate the probability that the transition temperature is lower than the specified temperature of the pipeline, based on the transition temperature of each ring weld joint.

[0059] The first optimization module is used to determine whether the welding process and welding materials need to be optimized based on the probability that the transition temperature is lower than the specified temperature of the pipeline.

[0060] The second data acquisition module is used to acquire pipeline strength test data and full weld strength test data under the automatic welding process of L485 pipeline high strain marine pipe;

[0061] The specified value calculation module is used to calculate the specified value of the tensile strength of the entire weld based on the pipeline strength test data;

[0062] The second optimization module is used to determine whether the welding process and welding materials need to be optimized based on the full weld strength test data and the specified value of the full weld tensile strength.

[0063] In use, simply input all the test data of different ring welded joints under the same process into the system. Through the cooperation of various modules, the steps described in the above method can be completed one by one, thereby optimizing the deformation capacity of oil and gas pipelines, ensuring the safety of oil and gas pipelines in practical applications, and providing a basis for ensuring the safety of oil and gas pipeline engineering construction.

[0064] This invention provides a terminal device comprising: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the various method embodiments described above. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the various device embodiments described above.

[0065] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention.

[0066] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0067] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0068] The memory can be used to store the computer program and / or module. The processor implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0069] If the modules / units integrated into the terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0070] In summary, under the existing standards and specifications for steel pipe and pipeline welding, this invention proposes further requirements for the strength and toughness of pipelines and circumferential welds, thereby improving the deformation capacity of oil and gas pipelines and reducing the risk of failure. These requirements can be specified and quantified, providing a basis for the formulation and revision of pipeline construction standards, thus providing technical support for the safe construction and stable operation of oil and gas pipelines, and possessing significant technical value and application prospects.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optimized method for improving the deformation capacity of oil and gas pipelines, characterized in that, Includes the following steps: Obtain experimental data on different ring welded joints under specific processes; Based on the test data of different ring weld joints, the transition temperature of each ring weld joint was obtained, specifically: Based on test data of different welded joints, the ductile-brittle transition curves of the Charpy impact fracture surface shear area of ​​different ring welded joints under specific processes were obtained, and the transition temperature of each ring welded joint was obtained from the ductile-brittle transition curves. Based on the transition temperature of each ring weld joint, calculate the probability that the transition temperature is lower than the specified temperature of the pipeline. Based on the probability that the transition temperature is lower than the specified temperature of the pipeline, determine whether it is necessary to optimize the welding process and welding materials; if so, then optimize the welding process and welding materials. No, proceed to the next step in sequence; Obtain pipeline strength test data and full weld strength test data for the above process; Based on the pipeline strength test data, the specified value of the tensile strength of the entire weld is calculated as follows: Based on the pipe strength test data, obtain the tensile strength of each pipe; calculate the average and variance of the tensile strength of the pipe according to the normal distribution function; based on the tensile strength distribution of the pipe, determine the specified value of the tensile strength of the entire weld if the probability of the specified value of the tensile strength of the entire weld being greater than the tensile strength of the pipe is 95%. Based on the full weld strength test data and the specified value of the full weld tensile strength, determine whether it is necessary to optimize the welding process and welding materials; If so, then optimize the welding process and welding materials; No, then the optimization ends.

2. The optimization method for improving the deformation capacity of oil and gas pipelines according to claim 1, characterized in that, The transition temperature is the temperature corresponding to 75% of the shear area of ​​the ring weld joint on the ductile-brittle transition curve.

3. The optimization method for improving the deformation capacity of oil and gas pipelines according to claim 1, characterized in that, The method for calculating the probability that the transition temperature is lower than the specified temperature of the pipeline based on the transition temperature of each ring weld joint is as follows: calculate the probability that the transition temperature is lower than the specified temperature under the specified temperature of the pipeline by statistically analyzing the variance and mean of the transition temperature according to the normal distribution function.

4. The optimized method for improving the deformation capacity of oil and gas pipelines according to claim 1, characterized in that, The method for determining whether to optimize the welding process and welding materials based on the probability that the transition temperature is lower than the specified temperature of the pipeline is as follows: if the probability that the transition temperature is lower than the specified temperature is less than 95%, then the welding process and welding materials need to be optimized to ensure that the fracture mode is ductile crack propagation failure; if the probability that the transition temperature is lower than the specified temperature is greater than or equal to 95%, then proceed to the next step in sequence.

5. The optimization method for improving the deformation capacity of oil and gas pipelines according to claim 1, characterized in that, Based on the full weld strength test data and the specified value of the full weld tensile strength, the method to determine whether the welding process and welding materials need to be optimized is as follows: Based on the full weld strength test data, obtain the full weld tensile strength of each circumferential weld joint, and statistically analyze the average and variance of the full weld tensile strength according to the normal distribution function; if the probability that the full weld tensile strength is greater than the specified value of the full weld tensile strength is less than 95%, then the welding process and welding materials need to be optimized to ensure the strong matching of the circumferential weld joint; If the probability that the tensile strength of the entire weld is greater than or equal to the specified value is greater than or equal to 95%, then the optimization ends.

6. A system for improving the deformation capacity of oil and gas pipelines, characterized in that, include: The first data acquisition module is used to acquire test data of different ring welded joints under specific processes; The transition temperature acquisition module is used to obtain the transition temperature of each ring weld joint based on test data of different ring weld joints. Specifically: Based on test data of different welded joints, the ductile-brittle transition curves of the Charpy impact fracture surface shear area of ​​different ring welded joints under specific processes were obtained, and the transition temperature of each ring welded joint was obtained from the ductile-brittle transition curves. The probability calculation module is used to calculate the probability that the transition temperature is lower than the specified temperature of the pipeline, based on the transition temperature of each ring weld joint. The first optimization module is used to determine whether the welding process and welding materials need to be optimized based on the probability that the transition temperature is lower than the specified temperature of the pipeline. The second data acquisition module is used to acquire the pipeline strength test data and the full weld strength test data of the above process; The specified value calculation module is used to calculate the specified value of the tensile strength of the entire weld based on the pipeline strength test data. Specifically: Based on the pipe strength test data, obtain the tensile strength of each pipe; calculate the average and variance of the tensile strength of the pipe according to the normal distribution function; based on the tensile strength distribution of the pipe, determine the specified value of the tensile strength of the entire weld if the probability of the specified value of the tensile strength of the entire weld being greater than the tensile strength of the pipe is 95%. The second optimization module is used to determine whether the welding process and welding materials need to be optimized based on the full weld strength test data and the specified value of the full weld tensile strength.

7. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1-5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-5.

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