Christmas tree safety evaluation method and system based on phased array ultrasonic detection

Abstract

The invention discloses a Christmas tree safety evaluation method and system based on phased array ultrasonic detection. The Christmas tree safety evaluation method comprises the steps that a Christmas tree finite element model is established according to Christmas tree structure parameters; christmas tree defect parameters are determined according to phased array ultrasonic detection data; according to the finite element model and the defect parameters, the stress state and the corrosion state of the preset key part of the Christmas tree are determined, and therefore the safety level of the Christmas tree is determined. Defect detection data are obtained through a phased array ultrasonic detection technology, defect parameters are accurately, rapidly and sensitively monitored, a Christmas tree model is used for carrying out stress analysis and state simulation on the Christmas tree according to the defect parameters, the working state of the Christmas tree can be observed more visually, and quantitative analysis is carried out on the working condition of the Christmas tree; the safety of the Christmas tree is quantitatively analyzed according to the stress state and the corrosion state of the preset key part of the Christmas tree, the safety level of the Christmas tree is determined, theoretical guidance can be provided for on-site hierarchical management and control of the Christmas tree, and the safety of oil and gas development is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of Christmas tree safety assessment, and in particular relates to a Christmas tree safety assessment method and system based on phased array ultrasonic detection. Background Art

[0002] Christmas trees are key equipment in the oil production process. They are used to control wellhead pressure, regulate flow, and connect oil wells to production pipelines. The normal operation of Christmas trees is crucial to the economic benefits of oil fields. During long-term operation, Christmas trees may suffer from corrosion, fatigue, cracks, and other problems, which may lead to accidents such as leakage and rupture. Paying attention to the safety of Christmas trees can achieve real-time monitoring and evaluation of equipment, discover potential safety hazards, detect faults and anomalies in a timely manner, and ensure the safety and reliability of equipment operation, thereby reducing downtime for maintenance and improving the economic benefits of oil fields.

[0003] With the development of non-destructive testing technology, ultrasonic testing, magnetic particle testing and other methods have been applied in the safety evaluation of Christmas trees. Among them, phased array ultrasonic technology can conduct comprehensive and rapid detection of the structure of Christmas trees. Specifically, phased array ultrasonic testing refers to the technology of using an array composed of multiple ultrasonic transmitters and receivers to generate and receive ultrasonic signals. Its principle is based on the characteristics of acoustic waves propagating in the medium. By controlling the time delay and amplitude between the transmitter and the receiver, it can achieve imaging and detection of the target. Compared with conventional ultrasonic testing technology, it has higher resolution and detection sensitivity. Therefore, phased array ultrasonic testing technology can provide quantitative structural and defect information, but at present, after identifying the structure of the Christmas tree and various defect forms, it is impossible to correctly evaluate the safety of the Christmas tree and classify the safety level according to the existing defects. There are certain challenges in the safety management of Christmas trees at oil and gas production sites. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a Christmas tree safety evaluation method and system based on phased array ultrasonic detection, to quantitatively analyze the defects of the Christmas tree according to the phased array ultrasonic detection results, to judge its safety level, and to take targeted measures to ensure the safety of oil field exploitation.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a Christmas tree safety evaluation method based on phased array ultrasonic detection, comprising the following steps:

[0006] S1: Acquire structural parameters of the Christmas tree, and establish a finite element model of the Christmas tree according to the structural parameters;

[0007] S2: Acquire phased array ultrasonic testing data of the Christmas tree, and determine defect parameters of the Christmas tree according to the testing data;

[0008] S3: determining the stress state and corrosion state of the preset key parts of the Christmas tree based on the finite element model of the Christmas tree and the defect parameters;

[0009] S4: Determine the safety level of the Christmas tree according to the stress state and corrosion state of the preset key parts of the Christmas tree.

[0010] Furthermore, in S1, the structural parameters of the Christmas tree include but are not limited to geometric parameters, material parameters, connection parameters and load parameters of the Christmas tree.

[0011] Furthermore, in S1, the type of the finite element unit is selected according to the geometric parameters; the material properties of each of the finite element units are determined according to the material parameters; the connection relationship between the finite element units is established according to the connection parameters; and the stress condition of the Christmas tree during operation is simulated according to the load parameters and preset boundary conditions.

[0012] Furthermore, in S2, the defect parameters include corrosion defect parameters, crack defect parameters and welding defect parameters, the corrosion defect parameters include corrosion position, corrosion depth, corrosion area and corrosion type; the crack defect parameters include crack position, crack length, crack depth and crack area; the welding defect parameters include weld size and welding defect type.

[0013] Further, the S2 comprises the following steps:

[0014] S21: Acquire multiple ultrasonic detection images of the Christmas tree and the Christmas tree wall thickness data;

[0015] S22: determining the corrosion defect parameters of the Christmas tree according to the Christmas tree wall thickness data and the echo signal strength and spacing in the plurality of ultrasonic detection images;

[0016] S23: extracting crack signal morphology, intensity and distribution characteristics according to the reflection or diffraction signals of the plurality of ultrasonic detection images, and determining the crack defect parameters of the Christmas tree based on the crack signal morphology, intensity and distribution characteristics;

[0017] S24: determining whether there is abnormal signal fracture in the plurality of ultrasonic detection images; if there is abnormal signal fracture, determining the welding defect parameter of the Christmas tree in combination with the Christmas tree wall thickness data.

[0018] Further, the S3 comprises the following steps:

[0019] S31: adding the defect parameters to the Christmas tree finite element model, and performing strength analysis and force analysis through the Christmas tree finite element model;

[0020] S32: Determine the stress state and corrosion state of the Christmas tree body, flange connection and valve according to the results of the strength analysis and the stress analysis.

[0021] Further, the S4 comprises the following steps:

[0022] S41: according to the maximum stress of the Christmas tree at the corrosion position, a stress coefficient is obtained according to the maximum stress and a preset stress threshold, and the Christmas tree corrosion level is determined according to the stress coefficient;

[0023] S42: determining a stress load coefficient of the preset key part according to the stress state of the preset key part of the Christmas tree, and determining a damage level of the preset key part according to the stress load coefficient;

[0024] S43: Determine the safety level of the Christmas tree according to the corrosion level of the Christmas tree and the damage level of the preset key parts based on a quantitative analysis method.

[0025] Further, the S43 includes the following steps:

[0026] S431: Determine the weight coefficient of the Christmas tree corrosion level and the preset key part damage level;

[0027] S432: Determine the quantitative evaluation index of the corrosion level and the damage level according to the preset evaluation rules and the weight coefficient;

[0028] S433: Determine the safety level of the Christmas tree based on the quantitative evaluation index.

[0029] Furthermore, the present invention also provides a Christmas tree safety evaluation system based on phased array ultrasonic detection, which is used to run the above-mentioned Christmas tree safety evaluation method based on phased array ultrasonic detection, comprising:

[0030] A model building module, used to obtain structural parameters of the Christmas tree and build a finite element model of the Christmas tree according to the structural parameters;

[0031] A defect acquisition module, used to acquire phased array ultrasonic detection data of the Christmas tree, and determine defect parameters of the Christmas tree according to the detection data;

[0032] An analysis module, used to determine the stress state and corrosion state of the preset key parts of the Christmas tree based on the finite element model of the Christmas tree and the defect parameters;

[0033] An evaluation module is used to determine the safety level of the Christmas tree according to the stress state and corrosion state of preset key parts of the Christmas tree.

[0034] Furthermore, the present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer algorithm, and the computer algorithm implements the above-mentioned data processing when executed by a processor.

[0035] The advantages and positive effects of the present invention are:

[0036] The method provided by the present invention obtains defect detection data through phased array ultrasonic detection technology, can accurately, quickly and sensitively monitor defect parameters, and uses the Christmas tree model to perform stress analysis and state simulation on the Christmas tree according to the defect parameters, so as to more intuitively observe the working state of the Christmas tree and quantitatively analyze the working conditions of the Christmas tree; quantitatively analyze the safety of the Christmas tree according to the stress state and corrosion state of preset key parts of the Christmas tree, determine the safety level of the Christmas tree, and provide theoretical guidance for on-site hierarchical management and control of the Christmas tree, thereby ensuring the safety of oil and gas development. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall process of an embodiment of the method of the present invention.

[0038] Figure 2 It is a schematic diagram of the structure of the finite element model of the Christmas tree according to the method embodiment of the present invention.

[0039] Figure 3 It is a schematic diagram of the ultrasonic detection image structure of an embodiment of the method of the present invention.

[0040] Figure 4 It is a schematic diagram of the overall structure of an embodiment of the system of the present invention.

[0041] In the figure:

[0042] 1. Christmas tree safety evaluation system; 101. Model building module; 102. Defect acquisition module; 103. Analysis module; 104. Evaluation module. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0045] like Figure 1 As shown, a Christmas tree safety evaluation method based on phased array ultrasonic testing includes the following steps:

[0046] S1: Obtain the structural parameters of the Christmas tree, and establish a finite element model of the Christmas tree according to the structural parameters. Specifically, the structural parameters of the Christmas tree include but are not limited to the geometric parameters, material parameters, connection parameters and load parameters of the Christmas tree. Among them, the type of finite element unit is selected according to the geometric parameters; the material properties of each finite element unit are determined according to the material parameters; the connection relationship between the finite element units is established according to the connection parameters; and the stress conditions of the Christmas tree during operation are simulated according to the load parameters and preset boundary conditions.

[0047] Specifically, Figure 2 As shown, in this embodiment, the finite element model of the Christmas tree is built by Unity3D software. The specific steps are as follows:

[0048] According to the actual structure of the Christmas tree, determine the geometry of the model, including the main pipeline, valves, flange connections and other parts. According to the geometry of the model and analysis requirements, select appropriate unit types, such as line units, surface units or volume units, and divide the structure of the Christmas tree into finite element mesh units. According to the actual material properties of the Christmas tree, define material properties for each finite element. Material properties include elastic modulus, Poisson's ratio, density, etc. According to the analysis requirements and actual conditions, set appropriate boundary conditions. Constraints include boundary constraints (such as fixed boundaries, support boundaries) and loading boundary conditions (such as pressure loading, force loading). According to the actual connection method of the Christmas tree, establish constraints between nodes and contact relationships between units. According to the actual working conditions, apply corresponding loads or pressures to the model to simulate the stress conditions of the Christmas tree during operation.

[0049] During the simulation, the finite element analysis software is used to solve the established model, and the stress, strain, deformation and other results of the model at each node and unit are calculated according to the loading and boundary conditions. The safety and stability of the Christmas tree structure are analyzed through the solution results, and the stress, deformation and other parameters of key parts are evaluated to determine whether the design requirements are met.

[0050] S2: Obtain the phased array ultrasonic inspection data of the Christmas tree, and determine the defect parameters of the Christmas tree based on the inspection data. Specifically, in some scenarios, if a more comprehensive status inspection and evaluation of the Christmas tree is required, a combination of manual ultrasound and ultrasonic phased array or ultrasound and TOFD (Time-of-Flight Diffraction) can be used for ultrasonic inspection to obtain more comprehensive sensor data, providing an effective data basis for subsequent safety assessments. In addition, it should be noted that the phased array sector scan is composed of a series of scans at different angles. Therefore, when using phased array ultrasonic testing, it is necessary to perform ultrasonic testing on the Christmas tree at multiple angles and multiple positions to obtain multiple ultrasonic detection images. Specifically as follows,

[0051] For each sector inspection area, the quantitative expression of the A scan number is as follows:

[0052]

[0053] In the formula, A num is the number of scans A, θ be is the starting angle of the sector scan, θ af is the sector scanning stop angle, and α is the scanning angle step.

[0054] Preferably, the defect parameters include corrosion defect parameters, crack defect parameters and welding defect parameters. The corrosion defect parameters include corrosion position, corrosion depth, corrosion area and corrosion type; the crack defect parameters include crack position, crack length, crack depth and crack area; and the welding defect parameters include weld size and welding defect type. Specifically, S2 includes the following steps:

[0055] S21: Acquire multiple ultrasonic detection images of the Christmas tree and the Christmas tree wall thickness data.

[0056] S22: Determine the corrosion defect parameters of the Christmas tree according to the Christmas tree wall thickness data and the echo signal strength and spacing in the multiple ultrasonic detection images.

[0057] S23: extracting crack signal morphology, intensity and distribution characteristics according to the reflection or diffraction signals of the plurality of ultrasonic detection images, and determining crack defect parameters of the Christmas tree based on the crack signal morphology, intensity and distribution characteristics.

[0058] S24: determining whether there is abnormal signal fracture in the plurality of ultrasonic detection images; if there is abnormal signal fracture, determining welding defect parameters of the Christmas tree in combination with the Christmas tree wall thickness data.

[0059] Specifically, before defect location, the collected ultrasonic detection images need to be preprocessed. These preprocessing operations may include denoising, smoothing, contrast enhancement, etc. Denoising can be achieved through filtering algorithms, while smoothing and contrast enhancement can be achieved through methods such as histogram equalization. On the preprocessed image, it is necessary to extract possible defect areas. These areas usually manifest as signal anomalies, reflection changes, or interference.

[0060] like Figure 3 As shown, in ultrasonic images, corrosion defects usually appear as reduced thickness in local areas. By analyzing the echo signal intensity and spacing changes in ultrasonic images, the degree of corrosion can be quantitatively evaluated and the location and size of corrosion defects can be determined.

[0061] Crack defects usually appear as obvious signal reflection or diffraction in ultrasonic images. By analyzing the crack signal morphology, intensity and distribution characteristics in ultrasonic images, the location, length and morphology of the crack can be determined, and its impact on the Christmas tree structure can be determined.

[0062] Welding defects are usually manifested as abnormal changes in signals, such as signal breakage, attenuation, scattering, etc. Combined with the wall thickness data of the Christmas tree, the thickness changes in the welding area and the surrounding area can be compared to determine whether there are welding defects.

[0063] It should be noted that the thickness of the valve neck of the Christmas tree is the thinnest part of the Christmas tree body, so the measured value of the thickness is directly related to the pressure bearing capacity of the Christmas tree. When judging corrosion and welding defects, the wall thickness needs to be considered as a defect judgment factor. The structural strength of each valve neck of the Christmas tree is checked through ultrasonic thickness measurement data. When the design pressure of the Christmas tree P≤0.4KS, the calculation formula for the minimum allowable wall thickness is:

[0064]

[0065] Where l is the minimum wall thickness, D is the radius of the valve neck cylinder, P is the design pressure, S is the allowable material stress, and k is the load combination coefficient, which is generally taken as 1.0.

[0066] The wall thickness margin can be determined based on the minimum allowable wall thickness and the wall thickness data measured on site. When the wall thickness margin meets the design requirements, the wall thickness is judged to meet the usage requirements. The actual bearing pressure is further evaluated in the finite element model of the Christmas tree based on the measured wall thickness to determine the force level.

[0067] S3: Based on the finite element model of the Christmas tree and the defect parameters, determine the stress state and corrosion state of the preset key parts of the Christmas tree. Specifically, S3 includes the following steps:

[0068] S31: Add defect parameters to the Christmas tree finite element model, and perform strength analysis and force analysis through the Christmas tree finite element model.

[0069] S32: Based on the results of strength analysis and force analysis, determine the stress state and corrosion state of the Christmas tree body, flange connections and valves.

[0070] S4: Determine the safety level of the Christmas tree according to the stress state and corrosion state of the preset key parts of the Christmas tree. Specifically, S4 includes the following steps:

[0071] S41: According to the maximum stress of the Christmas tree at the corrosion position, a stress coefficient is obtained according to the maximum stress and a preset stress threshold, and the Christmas tree corrosion grade is determined according to the stress coefficient.

[0072] S42: determining a stress load coefficient of the preset key part according to the stress state of the preset key part of the Christmas tree, and determining a damage level of the preset key part according to the stress load coefficient.

[0073] S43: Determine the safety level of the Christmas tree based on the quantitative analysis method according to the corrosion level of the Christmas tree and the damage level of the preset key parts. Wherein, S43 includes the following steps:

[0074] S431: Determine the weight coefficients of the Christmas tree corrosion level and the damage level of the preset key parts.

[0075] S432: Determine the quantitative evaluation index of the corrosion level and the damage level according to the preset evaluation rules and weight coefficients.

[0076] S433: Determine the safety level of the Christmas tree based on the quantitative evaluation index.

[0077] Specifically, in the safety level evaluation of the Christmas tree, according to relevant research, the key parts of the oil well are mainly the Christmas tree body, flange connections and valves, among which the valve is the most important component. The corrosion, crack and welding defect scores of the Christmas tree body, flange connections and valves are obtained through expert scoring, and the corresponding safety performance impact weight values ​​are further obtained. The corresponding results are shown in Table 1.

[0078] Table 1 Corresponding weights of Christmas tree safety performance

[0079]

[0080]

[0081] The maximum stress at the corrosion location is simulated in the finite element model of the Christmas tree. Assuming the stress is f, the corresponding design strength of the corrosion location is f re , then the stress coefficient The following rules are set: when σ≥2, the stress coefficient is 1, when 1.5>σ≥2, the stress coefficient is 0.7, when 1.2>σ≥1.5, the stress coefficient is 0.5, when 1>σ≥1.2, the stress coefficient is 0.2, and when σ>1, the stress coefficient is 0. A stress coefficient of 0 means that the strength at this time does not meet the design strength standard.

[0082] Similarly, the stress conditions of the corresponding parts are analyzed according to the crack position, crack length, crack depth and crack area in the finite element model of the Christmas tree, and the stress coefficient is calculated according to the design stress standard. The comprehensive scoring quantitative table of the Christmas tree safety performance can be obtained as shown in Table 2:

[0083] Table 2 Comprehensive scoring table of safety performance of Christmas trees

[0084]

[0085] The safety level of the Christmas tree is evaluated based on the quantitative score.

[0086] Among them, the safety level can be divided into four levels, one to four, according to the different safety levels to design inspection and maintenance plans, such as level one is the highest safety factor level, then the inspection frequency is 2 hours, to ensure the smooth communication between the operator and the monitoring center; if the safety factor is four, it means that the safety level is low, need to pay close attention to the working condition of the oil production tree, the inspection frequency is 10 minutes, and additional sensor types are added to observe a variety of parameters, timely eliminate safety hazards, after the operation is completed, replace the key parts with large wear and tear, etc.

[0087] In order to better implement the Christmas tree safety evaluation method based on phased array ultrasonic detection in the embodiment of the present invention, on the basis of the Christmas tree safety evaluation method based on phased array ultrasonic detection, correspondingly, Figure 4 As shown, the present invention also provides a Christmas tree safety evaluation system 1 based on phased array ultrasonic detection, comprising:

[0088] The model building module 101 is used to obtain structural parameters of the Christmas tree and build a finite element model of the Christmas tree according to the structural parameters.

[0089] The defect acquisition module 102 is used to acquire phased array ultrasonic detection data of the Christmas tree and determine the defect parameters of the Christmas tree according to the detection data.

[0090] The analysis module 103 is used to determine the stress state and corrosion state of the preset key parts of the Christmas tree based on the finite element model of the Christmas tree and the defect parameters.

[0091] The evaluation module 104 is used to determine the safety level of the Christmas tree according to the stress state and corrosion state of the preset key parts of the Christmas tree.

[0092] It should be noted here that the corresponding system 1 provided in the above embodiment can implement the technical solutions described in the above method embodiments. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above method embodiments, which will not be repeated here.

[0093] The advantages and positive effects of the present invention are:

[0094] The method provided by the present invention obtains defect detection data through phased array ultrasonic detection technology, can accurately, quickly and sensitively monitor defect parameters, and uses the Christmas tree model to perform stress analysis and state simulation on the Christmas tree according to the defect parameters, so as to more intuitively observe the working state of the Christmas tree and quantitatively analyze the working conditions of the Christmas tree; quantitatively analyze the safety of the Christmas tree according to the stress state and corrosion state of preset key parts of the Christmas tree, determine the safety level of the Christmas tree, and provide theoretical guidance for on-site hierarchical management and control of the Christmas tree, thereby ensuring the safety of oil and gas development.

[0095] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A Christmas tree safety assessment method based on phased array ultrasonic testing, characterized in that: The following steps are included: S1: Acquire structural parameters of the Christmas tree, and establish a finite element model of the Christmas tree according to the structural parameters; S2: Acquire phased array ultrasonic testing data of the Christmas tree, and determine defect parameters of the Christmas tree according to the testing data; S3: determining the stress state and corrosion state of the preset key parts of the Christmas tree based on the finite element model of the Christmas tree and the defect parameters; S4: Determine the safety level of the Christmas tree according to the stress state and corrosion state of the preset key parts of the Christmas tree.

2. The method for safety assessment of Christmas trees based on phased array ultrasonic testing according to claim 1, characterized in that: In S1, the structural parameters of the Christmas tree include but are not limited to geometric parameters, material parameters, connection parameters and load parameters of the Christmas tree.

3. The method for safety assessment of Christmas trees based on phased array ultrasonic testing according to claim 2, characterized in that: In S1, the type of the finite element unit is selected according to the geometric parameters; the material properties of each of the finite element units are determined according to the material parameters; the connection relationship between the finite element units is established according to the connection parameters; and the stress condition of the Christmas tree during operation is simulated according to the load parameters and preset boundary conditions.

4. A Christmas tree safety assessment method based on phased array ultrasonic testing according to any one of claims 1 to 3, characterized in that: In S2, the defect parameters include corrosion defect parameters, crack defect parameters and welding defect parameters, the corrosion defect parameters include corrosion position, corrosion depth, corrosion area and corrosion type; the crack defect parameters include crack position, crack length, crack depth and crack area; the welding defect parameters include weld size and welding defect type.

5. The method for safety assessment of Christmas trees based on phased array ultrasonic testing according to claim 4, characterized in that: The S2 comprises the following steps, S21: Acquire multiple ultrasonic detection images of the Christmas tree and the Christmas tree wall thickness data; S22: determining the corrosion defect parameters of the Christmas tree according to the Christmas tree wall thickness data and the echo signal strength and spacing in the plurality of ultrasonic detection images; S23: extracting crack signal morphology, intensity and distribution characteristics according to the reflection or diffraction signals of the plurality of ultrasonic detection images, and determining the crack defect parameters of the Christmas tree based on the crack signal morphology, intensity and distribution characteristics; S24: determining whether there is abnormal signal fracture in the plurality of ultrasonic detection images; if there is abnormal signal fracture, determining the welding defect parameter of the Christmas tree in combination with the Christmas tree wall thickness data.

6. A Christmas tree safety assessment method based on phased array ultrasonic testing according to any one of claims 1 to 3, characterized in that: The S3 comprises the following steps, S31: adding the defect parameters to the Christmas tree finite element model, and performing strength analysis and force analysis through the Christmas tree finite element model; S32: Determine the stress state and corrosion state of the Christmas tree body, flange connection and valve according to the results of the strength analysis and the stress analysis.

7. A Christmas tree safety assessment method based on phased array ultrasonic testing according to any one of claims 1 to 3, characterized in that: The S4 comprises the following steps, S41: according to the maximum stress of the Christmas tree at the corrosion position, a stress coefficient is obtained according to the maximum stress and a preset stress threshold, and the Christmas tree corrosion level is determined according to the stress coefficient; S42: determining a stress load coefficient of the preset key part according to the stress state of the preset key part of the Christmas tree, and determining a damage level of the preset key part according to the stress load coefficient; S43: Determine the safety level of the Christmas tree according to the corrosion level of the Christmas tree and the damage level of the preset key parts based on a quantitative analysis method.

8. The method for safety assessment of Christmas trees based on phased array ultrasonic testing according to claim 7, characterized in that: The S43 The following steps are included: S431: Determine the weight coefficient of the Christmas tree corrosion level and the preset key part damage level; S432: Determine the quantitative evaluation index of the corrosion level and the damage level according to the preset evaluation rules and the weight coefficient; S433: Determine the safety level of the Christmas tree based on the quantitative evaluation index.

9. A Christmas tree safety assessment system based on phased array ultrasonic detection, used to run the Christmas tree safety assessment method based on phased array ultrasonic detection according to any one of claims 1 to 8, characterized in that: include, A model building module, used to obtain structural parameters of the Christmas tree and build a finite element model of the Christmas tree according to the structural parameters; A defect acquisition module, used to acquire phased array ultrasonic detection data of the Christmas tree, and determine defect parameters of the Christmas tree according to the detection data; An analysis module, used to determine the stress state and corrosion state of the preset key parts of the Christmas tree based on the finite element model of the Christmas tree and the defect parameters; An evaluation module is used to determine the safety level of the Christmas tree according to the stress state and corrosion state of preset key parts of the Christmas tree.

10. A computer-readable storage medium storing a computer algorithm, characterized in that: When the computer algorithm is executed by a processor, the data processing according to any one of claims 1 to 8 is realized.

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