Deformed pipeline maintenance judgment method and system, electronic equipment and storage medium

Abstract

The invention discloses a deformed pipeline maintenance judgment method and system. The method comprises the following core steps: when a sunken deformation defect exists, judging whether to maintain immediately or not according to the maximum depth of sunken deformation, the measured maximum stress at the deformation defect and the actual operation age limit and the operation condition of a pipeline; when the elliptical deformation defect exists, judging whether to maintain immediately or not according to the calculated maximum deformation, ellipticity and the position of the pipe section where the defect is located, the measured maximum circumferential stress near the long axis of the elliptical deformation defect and the actual operation age limit and the operation condition of the pipeline; and when the pipeline does not have a buckling deformation defect but has local elliptical or sunken deformation and is accompanied by certain bending deformation, judging whether to maintain immediately according to the measured circumferential stress and axial stress of the elliptical deformation or sunken deformation, the curvature radius value of the pipeline and the actual operation age limit and operation condition of the pipeline. According to the method, multiple defect types can be maintained and judged, and the service life of buckling deformation at the defect position can be predicted.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas pipeline repair and maintenance, and in particular to a method, system, electronic equipment and storage medium for determining repair of a deformed pipeline. Background Art

[0002] Oil and gas pipelines need to be laid for long-distance transportation. Due to factors such as improper backfilling during construction of oil and gas pipelines or interference from external forces during operation, oil and gas pipelines usually produce local depressions, ovals, wrinkles, buckling, bulging and other deformations. Pipeline deformation defects found by deformation internal detectors are usually verified and re-inspected by excavation.

[0003] The current industry standard SY / T 6996 involves depth-based and strain-based evaluation methods in the evaluation of dent-type deformation defects. Both methods determine whether repair is needed based on the appearance size of the dent deformation. In the industry standard, the criteria for determining whether repair is needed are also determined based on experience. This type of determination method will cause two problems: excessive repair of deformation defects that do not require repair or failure to repair dangerous defects that require repair in a timely manner. In addition, the current standard does not have a repair determination method for deformation defects such as ellipse, wrinkle, buckling, and bulging.

[0004] There are also evaluation methods for pipeline dent deformation in the prior art. For example, Chinese patent CN112115572B discloses a safety evaluation method for pipeline dent defects. By establishing a model to simulate the process of pipeline dent defects during operation, the defect parameters corresponding to the maximum damage amount are obtained, which are the defect parameters before pipeline rebound and the defect parameters after rebound, respectively, which are defined as monitoring thresholds and repair thresholds. Finally, the two thresholds are corrected with the actual operating pressure of the pipeline. During the actual evaluation, the actual defect parameters of the pipeline are compared with the corrected monitoring thresholds and repair thresholds, and the safety level of the pipeline can be easily obtained. This method first requires obtaining a real three-dimensional model of the pipeline dent defect, and involves more professional work such as model building, analysis and solution, which is difficult to apply on site; and this type of solution is also unable to make effective maintenance judgments for deformations such as ellipse and buckling.

[0005] Therefore, there is an urgent need for a method for repair judgment of deformed pipelines, which does not require the establishment of a complex model to simulate the process of pipeline defect generation, and can not only make repair judgments for concave deformation, but also for elliptical deformation and buckling deformation.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The purpose of the present invention is to provide a method and system for repair determination of deformed pipelines, which does not require the establishment of a complex model to simulate the process of pipeline defect generation, and can not only perform repair determination on concave deformation, but also perform repair determination on elliptical deformation and / or buckling deformation.

[0008] Another object of the present invention is to provide a method and system for determining the repair of a deformed pipeline, which can further predict the life of the deformed part before buckling deformation occurs when there is concave deformation or elliptical deformation and no immediate repair is required.

[0009] To achieve the above-mentioned object, according to a first aspect of the present invention, a method for determining whether to repair a deformed pipeline is provided. After excavation of the pipeline, a maintenance determination is performed, which comprises the following steps: A. judging whether to repair immediately according to the distance between the edge of the deformation defect and the edge of the pipeline weld, whether there are two or more deformation defects or the distance between the edges of two or more deformation defects, and whether there is a crack or metal loss at the deformation defect; B. judging whether to repair immediately according to the maximum depth of the concave deformation, the maximum stress at the deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline when there is a concave deformation defect; C. judging whether to repair immediately according to the maximum deformation amount, ovality, the pipe section position where the defect is located, the maximum hoop stress near the long axis of the elliptical deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline when there is an elliptical deformation defect; D. judging whether to repair immediately according to the hoop stress and axial stress of the elliptical deformation or concave deformation obtained by measurement, the value of the pipeline curvature radius, and the actual operating years and operating conditions of the pipeline when there is no buckling deformation defect in the pipeline, but a local elliptical or concave deformation occurs with a certain bending deformation.

[0010] Furthermore, in the above technical solution, the method may also include the following steps: E. When it is determined in step D that no immediate maintenance is required, the buckling deformation life is predicted by calculating the obtained stress fluctuation number data.

[0011] Furthermore, in the above technical solution, in step A, when the distance between the edge of the deformation defect and the edge of the pipeline weld is less than or equal to 10 times the pipeline wall thickness, it is determined that immediate repair is required; otherwise, when there are more than two deformation defects or the distance between the edges of more than two deformation defects is less than or equal to 100 times the pipeline wall thickness, it is determined that immediate repair is required; otherwise, when there are cracks or metal loss at the deformation defect, it is determined that immediate repair is required.

[0012] Further, in the above technical solution, step B can be specifically as follows: when the maximum depth of the concave deformation is ≥6%D, where D is the pipe diameter, it is determined that immediate repair is required; otherwise, the safety stress σ at the deformation defect is calculated. s, and the maximum stress σ at the deformation defect is measured by multi-division method. When σ / σ s ≥k, it is judged that maintenance should be carried out immediately. s <k, it is judged that no immediate maintenance is needed, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1.

[0013] Furthermore, in the above technical solution, the multi-division method may adopt the binary method, the quarter method or the octave method; and the measuring equipment may adopt the dual-probe electromagnetic ultrasonic measurement.

[0014] Furthermore, in the above technical solution, the safety stress σ at the deformation defect is s The specific calculation method is as follows:

[0015] If the defect is in the straight pipe section:

[0016]

[0017] Among them, MAOP is the maximum allowable operating pressure of the pipeline at the defect, D is the outer diameter of the pipeline at that location, and δ is the wall thickness of the pipeline at that location;

[0018] If the defect is located at the bend section:

[0019]

[0020] Where m is the correction coefficient and R is the radius of curvature of the curved pipe section.

[0021] Further, in the above technical solution, step C can be specifically as follows: when the maximum deformation A ≥ 6%, it is determined that immediate maintenance is required; otherwise, it is determined whether the ovality B meets the immediate maintenance conditions, and when the elliptical deformation defect is located in the straight pipe section and the ovality B ≤ 1%, it is determined that no immediate maintenance is required, or, when the elliptical deformation defect is located in the curved pipe section and the elliptical degree B ≤ 2.5%, it is determined that no immediate maintenance is required; otherwise, the maximum hoop stress σ near the major axis of the elliptical deformation defect and the safety stress value σ at the vertex of the major axis of the ellipse are further calculated. s ratio.

[0022] Furthermore, in the above technical solution, when σ / σ s ≥k, it is judged that maintenance should be carried out immediately. s <k, it is judged that no immediate maintenance is needed, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1.

[0023] Furthermore, in the above technical solution, the safety stress value σ at the vertex of the major axis of the ellipse s The specific calculation method is as follows:

[0024] If the defect is in the straight pipe section:

[0025]

[0026] Among them, MAOP is the maximum allowable operating pressure of the pipeline at the defect, D min is the minimum outer diameter of the elliptical deformation, D max is the maximum outer diameter at the elliptical deformation point, and δ is the pipe wall thickness at that point;

[0027] If the defect is located at the bend section:

[0028]

[0029] Among them, m is the correction coefficient, R is the radius of curvature of the curved pipe section, and D is the outer diameter of the pipe before deformation.

[0030] Further, in the above technical solution, step D may be specifically as follows: when the local elliptical or concave deformation is judged to not require immediate repair, and when the pipe curvature radius R obtained by measurement is ≤ 200D, the hoop stress σ of the elliptical deformation or concave deformation is measured respectively. h and axial stress σ z ;

[0031] when Then it is determined that immediate repair is required;

[0032] when It is judged that no immediate maintenance is required;

[0033] Wherein, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1.

[0034] Furthermore, in the above technical solution, the number of stress fluctuations in step E is used to characterize the buckling deformation life N, and the calculation method can be specifically as follows:

[0035]

[0036] in, K2=1+50B;

[0037] in,

[0038] In the formula, A is the buckling deformation life adjustment factor, which is determined according to the service life of the pipeline; σ b is the tensile strength of the pipeline material, MPa; K1 is the concave deformation factor, dimensionless; K2 is the elliptical deformation factor, dimensionless; h is the maximum depth of the concave deformation, mm; δ is the pipe wall thickness, mm; D is the outer diameter of the pipeline, mm; B is the ellipticity of the pipeline; σ cr is the critical stress of buckling deformation, MPa; σ h is the maximum hoop stress, MPa; K3 is the strength factor, MPa, which is between 800-1700 according to the pipeline model; εcr is the critical strain, according to the tensile strength of the pipeline material σ b The value is taken in different intervals; n is the strain hardening exponent, which is between 0.2-0.6 and obtained through measurement.

[0039] According to a second aspect of the present invention, the present invention provides a deformation pipeline maintenance judgment system, which performs maintenance judgment after pipeline excavation, including: a deformation maintenance initial judgment module, which is used to judge whether to perform maintenance immediately according to the distance between the edge of the deformation defect and the edge of the pipeline weld, whether there are two or more deformation defects or the distance between the edges of two or more deformation defects, and whether there are cracks or metal loss at the deformation defect; a concave maintenance judgment module, which is used to judge whether to perform maintenance immediately according to the maximum depth of the concave deformation, the maximum stress at the deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline when a concave deformation defect exists; The elliptical maintenance judgment module is used to determine whether to perform immediate maintenance when there is an elliptical deformation defect based on the calculated maximum deformation, ellipticity, the location of the pipe section where the defect is located, the measured maximum annular stress near the long axis of the elliptical deformation defect, and the actual operating life and operating conditions of the pipeline; the buckling maintenance judgment module is used to determine whether to perform immediate maintenance when the pipeline has not yet suffered from buckling deformation defects but has local elliptical or concave deformation accompanied by a certain bending deformation, based on the measured annular stress and axial stress of the elliptical deformation or concave deformation, the value of the pipeline curvature radius, and the actual operating life and operating conditions of the pipeline.

[0040] Furthermore, in the above technical solution, the system may also include: a buckling life prediction module, which is used to predict the buckling deformation life by calculating the obtained stress fluctuation number data when the buckling repair judgment module determines that no immediate repair is required.

[0041] According to a third aspect of the present invention, the present invention provides an electronic device for determining repair of a deformed pipeline, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes a method for determining repair of a deformed pipeline as described in any one of the above technical solutions.

[0042] According to a fourth aspect of the present invention, the present invention provides a non-transitory computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute a deformed pipeline maintenance determination method such as any one of the above technical solutions.

[0043] Compared with the prior art, the present invention has one or more of the following beneficial effects:

[0044] 1) The present invention does not need to establish a complex model to simulate the process of pipeline defect generation, and can not only make repair judgments for concave deformation, but also make repair judgments for elliptical deformation and / or buckling deformation;

[0045] 2) The present invention can further predict the life of the deformed part before buckling deformation occurs when there is concave deformation or elliptical deformation but no buckling deformation occurs and no immediate maintenance is required. By predicting the life of the pipeline with buckling deformation, the location of the buckling deformation hidden danger can be effectively monitored and the prediction results can be recorded, which is conducive to the timeliness of subsequent maintenance;

[0046] 3) The present invention can determine whether maintenance is needed based on the stress parameters of the pipe, avoiding the problem of excessive maintenance or untimely maintenance caused by the judgment method based on empirical values, and provides a basis for the maintenance of partial deformation defects such as concave, elliptical, and buckling;

[0047] 4) The method of the present invention is simple to operate. By measuring the deformation defects after excavation, the stress between the two probes is measured by dual-probe electromagnetic ultrasonic stress detection, and after combining with other measured values, no professional modeling and complex theoretical calculation process are required, so as to quickly determine whether the deformation defects need to be repaired;

[0048] 5) The present invention takes into account the actual operating life and operating conditions of the pipeline with respect to deformation defects, and makes a more accurate judgment on whether the deformation defects require immediate repair.

[0049] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a flow chart of the deformed pipeline maintenance determination method of the present invention.

[0051] Figure 2 It is a flow chart of a specific determination method for three deformation defects in the deformation pipeline maintenance determination method of the present invention.

[0052] Figure 3 It is a schematic diagram of dichotomy stress measurement for concave deformation in the deformed pipeline maintenance determination method of the present invention.

[0053] Figure 4 It is a schematic diagram of the stress measurement of the quartering method for the concave deformation in the deformed pipeline maintenance determination method of the present invention.

[0054] Figure 5It is a schematic diagram of stress measurement using the eight-point method for concave deformation in the deformed pipeline maintenance determination method of the present invention.

[0055] Figure 6 It is a structural schematic diagram of the deformed pipeline maintenance determination system of the present invention.

[0056] Figure 7 It is a hardware structure diagram of the electronic device for determining the repair of a deformed pipeline according to the present invention. DETAILED DESCRIPTION

[0057] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0058] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0059] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both the below and above directions. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0060] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0061] The method, system, electronic device and storage medium of the present invention are described in more detail below by way of specific embodiments. It should be understood that the embodiments are merely exemplary and the present invention is not limited thereto.

[0062] Example 1

[0063] like Figure 1 As shown, this embodiment provides a method for determining repair of a deformed pipeline, which is applicable to defect repair determination after pipeline excavation, and includes the following steps:

[0064] Step S101, judging whether to repair immediately according to the distance between the edge of the deformation defect and the edge of the pipeline weld, whether there are two or more deformation defects or two or more distances between the edges of the deformation defects, and whether there are cracks or metal loss at the deformation defect. Figure 2 As shown, first, peel off the anti-corrosion layer at the deformation defect of the pipeline, measure the distance between the edge of the deformation defect and the edge of the pipeline weld, if the distance is ≤10δ (δ is the pipe wall thickness), it is judged that the deformation defect needs to be repaired immediately; secondly, judge whether there are multiple types of deformations in the deformation defect, if there are more than two deformation defects at the same time or the distance between the edges of more than two deformation defects is ≤100δ, it is judged that the deformation defect needs to be repaired immediately; thirdly, use conventional non-destructive testing methods such as magnetic powder and ultrasound to detect whether there are cracks or metal loss defects at the deformation defect. If there are cracks or metal loss defects, it is judged that the deformation defect needs to be repaired immediately.

[0065] Step S102: When there is a concave deformation defect, determine whether to perform immediate maintenance based on the maximum depth of the concave deformation, the maximum stress at the deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline. Figure 2 First, measure the maximum depth of the concave deformation. When the maximum depth of the concave deformation is ≥6%D, in order to avoid the jamming of the pipe cleaner and the internal detector, it is determined that immediate maintenance is required; secondly, because the annular stress of the pipeline is greater than the axial stress when the pipeline is in operation, the annular stress of the undeformed pipeline is the largest. After the pipeline is concave and deformed, the direction of the maximum stress may change due to the irregular shape of the concave. Therefore, this embodiment adopts a multi-point measurement method to measure the maximum stress σ of the concave deformation defect. The measurement equipment of this embodiment preferably adopts dual-probe electromagnetic ultrasonic measurement.

[0066] Figure 3 This is a schematic diagram of the dichotomy stress measurement, where only the annular stress and axial stress of the pipe at the deformation location are measured. Figure 3 As shown, when a concave deformation defect 1 appears on the pipe 100, probes are arranged and installed at the circumferential positions 11 and 12, and probes are arranged and installed at the axial positions 21 and 22 for measurement. Figure 4 Figure 1 is a schematic diagram of stress measurement using the quartering method. In addition to measuring the annular stress and axial stress of the pipe at the deformation location, the stress at the 45° angle between the two is also measured. 11 and 12 are probe installation positions for detecting annular stress, 21 and 22 are probe installation positions for detecting axial stress, 31 and 32 are probe installation positions for detecting stress at a 45° angle between the annular and axial directions, and 41 and 42 are probe installation positions for detecting stress at a 135° angle between the annular and axial directions. Figure 5Figure 1 is a schematic diagram of stress measurement using the eight-point method, where 11 and 12 are probe installation positions for detecting circumferential stress, 21 and 22 are probe installation positions for detecting axial stress, 31 and 32 are probe installation positions for detecting stress in the direction of 45° between the circumferential and axial angles, 41 and 42 are probe installation positions for detecting stress in the direction of 135° between the circumferential and axial angles, 51 and 52 are probe installation positions for detecting stress in the direction of 22.5° between the circumferential and axial angles, 61 and 62 are probe installation positions for detecting stress in the direction of 67.5° between the circumferential and axial angles, 71 and 72 are probe installation positions for detecting stress in the direction of 112.5° between the circumferential and axial angles, and 81 and 82 are probe installation positions for detecting stress in the direction of 157.5° between the circumferential and axial angles.

[0067] Furthermore, when the maximum depth of the concave deformation is less than 6%D, the safety stress σ at the deformation defect is calculated s , the maximum stress σ at the deformation defect is measured by the aforementioned multi-partition method. When σ / σ s ≥k, it is judged that maintenance should be carried out immediately. s <k, it is judged that no immediate maintenance is needed, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1. Safety stress at the deformation defect σ s The specific calculation method can be as follows:

[0068] If the defect is in the straight pipe section:

[0069]

[0070] Among them, MAOP is the maximum allowable operating pressure of the pipeline at the defect, D is the outer diameter of the pipeline at that location, and δ is the wall thickness of the pipeline at that location;

[0071] If the defect is located at the bend section:

[0072]

[0073] Where m is the correction coefficient and R is the radius of curvature of the curved pipe section.

[0074] Step S103: When there is an elliptical deformation defect, determine whether to repair it immediately based on the calculated maximum deformation, ellipticity, the location of the pipe section where the defect is located, the measured maximum hoop stress near the long axis of the elliptical deformation defect, and the actual operating years and operating conditions of the pipeline. Specifically, first measure the maximum outer diameter D of the pipeline at the elliptical deformation defect. max and minimum outer diameter D min .

[0075] Calculate the ellipticity of an elliptical deformation defect:

[0076] Where D is the outer diameter of the undeformed pipe;

[0077] Calculate the maximum deformation of the elliptical deformation defect:

[0078]

[0079] Case 1: When A≥6%, in order to avoid the pipe cleaner and the internal detector from getting stuck, it is judged that immediate maintenance is needed; Case 2: When the elliptical deformation defect is located in the straight pipe section, B≤1%, it is judged that no immediate maintenance is needed; When the elliptical deformation defect is located in the curved pipe section, B≤2.5%, it is judged that no immediate maintenance is needed; Case 3: B>1% (elliptical deformation defect is located in the straight pipe section) or B>2.5% (elliptical deformation defect is located in the curved pipe section), and A<6%, when the pipeline undergoes elliptical deformation, the maximum annular stress is located near the major axis of the ellipse under the action of the internal pressure of the pipeline. The dual-probe electromagnetic ultrasonic stress detection system of this embodiment is used to measure the maximum annular stress σ near the major axis of the elliptical deformation defect, and the safe stress value σ at the vertex of the major axis of the ellipse is calculated at the same time. s When σ / σ s ≥k, it is judged that maintenance should be carried out immediately. s <k, it is judged that no immediate maintenance is needed, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1. Safety stress value σ at the vertex of the major axis of the ellipse s The specific calculation method can be as follows:

[0080] If the defect is in the straight pipe section:

[0081]

[0082] Among them, MAOP is the maximum allowable operating pressure of the pipeline at the defect, D min is the minimum outer diameter of the elliptical deformation, D max is the maximum outer diameter at the elliptical deformation point, and δ is the pipe wall thickness at that point;

[0083] If the defect is located at the bend section:

[0084]

[0085] Among them, m is the correction coefficient, R is the radius of curvature of the curved pipe section, and D is the outer diameter of the pipe before deformation.

[0086] Step S104, when the pipeline has not yet undergone buckling deformation defects, but has undergone local elliptical or concave deformation accompanied by a certain bending deformation, determine whether to perform immediate maintenance based on the measured hoop stress and axial stress of the elliptical deformation or concave deformation, the value of the pipeline curvature radius, and the actual operating years and operating conditions of the pipeline. Specifically, when the pipeline undergoes buckling deformation, the structure has become unstable and requires immediate maintenance. Before buckling deformation, the pipeline generally undergoes local elliptical or concave deformation, accompanied by bending deformation. Buckling deformation occurs when the bending deformation reaches a certain value. When it is determined that immediate maintenance is not required based on the aforementioned elliptical deformation defect or concave deformation defect, and when the pipeline curvature radius R≤200D is measured through internal detection, the hoop stress σ of the elliptical deformation or concave deformation is measured respectively. h and axial stress σ z .

[0087] when Then it is determined that immediate repair is required;

[0088] when It is judged that no immediate maintenance is required;

[0089] Wherein, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1.

[0090] Step S105, when in step S104, buckling deformation has not occurred and it is determined that no immediate maintenance is required, the buckling deformation life is predicted by calculating the obtained stress fluctuation number data. This embodiment predicts the buckling deformation life of the deformed part when elliptical and concave deformations have occurred but it is evaluated that no immediate maintenance is required. It can effectively monitor the location of the buckling deformation hidden danger and record the prediction results, which is conducive to the timeliness of subsequent maintenance. Specifically, this embodiment uses the stress fluctuation number to characterize the buckling deformation life N. The inventors have found that the calculation of the stress fluctuation number is closely related to the characteristics of the pipeline material, the structural dimensions of the pipeline, and the stress, strain and other indicators of the buckling deformation. Through experiments and calculation and fitting of finite element software, the calculation method obtained is specifically as follows:

[0091]

[0092] in, K2=1+50B;

[0093] in,

[0094] In the calculation formula of step S105, N is the buckling deformation life, that is, the number of stress fluctuations; A is the buckling deformation life adjustment factor, which is taken according to the operating years of the pipeline (operating years <5 years, take 1, operating years 5-10 years, take 2, operating years 10-15 years, take 3, operating years 10-20 years, take 4, operating years >20 years, take 5); σ b is the tensile strength of the pipeline material, MPa; K1 is the concave deformation factor, dimensionless; K2 is the elliptical deformation factor, dimensionless; h is the maximum depth of the concave deformation, mm; δ is the pipe wall thickness, mm; D is the outer diameter of the pipeline, mm; B is the ellipticity of the pipeline; σ cr is the critical stress of buckling deformation, MPa; σ h is the maximum hoop stress, MPa; K3 is the strength factor, MPa, which is between 800-1700 according to the pipeline model (X42 is 800, X46 is 1000, X52 is 1200, X56 is 1300, X60 is 1400, X65 is 1500, X70 is 1600, and X80 is 1700); ε cr is the critical strain, according to the tensile strength of the pipeline material σ b The values ​​of different intervals (σ b <552Mpa, take 0.01,552Mpa≤σ b <793Mpa, take 0.009, 793Mpa≤σ b <896Mpa, take 0.008); n is the strain hardening exponent, which is between 0.2-0.6 and obtained by measurement.

[0095] For example: a X52 pipe pipeline has been in operation for 8 years, with an operating pressure of 10 MPa, D = 355.6 mm, δ = 10 mm, σ b =460MPa, n=0.2, K3=1200MPa, there is a depression with a maximum depth of h=10mm on the pipe, and an ellipticity of 0.9%. By calculation, we can get σ cr =590MPa,σ A =2994MPa, K2=1.45, K1=2.89, N=1263. That is, the pipeline deformation can withstand 1263 stress fluctuations. Without considering the changes in the external load of the pipeline (earthquake, rolling, etc.), the internal pressure change of more than 10% is considered a stress fluctuation. Under normal operation of the pipeline, the internal pressure fluctuates about 80-150 times per year. Therefore, the buckling deformation life of the pipeline at this location is between 8.4 years and 15.8 years.

[0096] In this embodiment, there is no need to establish a complex model to simulate the process of pipeline defect generation, and maintenance judgment can be made not only for concave deformation, but also for elliptical deformation and / or buckling deformation. In the case where there is concave deformation or elliptical deformation and buckling deformation has not occurred and no immediate maintenance is required, the life of the deformed part where buckling deformation occurs can be further predicted. By predicting the pipeline life for buckling deformation, the location of buckling deformation hidden dangers can be effectively monitored and the prediction results can be recorded, which is conducive to the timeliness of subsequent maintenance. In this embodiment, whether maintenance is required can be determined based on the stress parameters of the pipe, avoiding the problem of excessive maintenance or untimely maintenance caused by the judgment method based on empirical values, and providing a basis for the maintenance of some deformation defects such as concave, elliptical, and buckling. The method of this embodiment is simple to operate. By measuring the deformation defect after excavation, the stress between the two probes is measured by dual-probe electromagnetic ultrasonic stress detection, and after combining other measured values, no professional modeling and complex theoretical calculation process are required, which is convenient for quickly judging whether the deformation defect needs maintenance. In this embodiment, the actual operating life and operating conditions of the pipeline are taken into consideration, and the judgment on whether the deformation defect needs immediate maintenance is more accurate.

[0097] Example 2

[0098] Combination Figure 6 As shown, this embodiment provides a deformation pipeline maintenance judgment system, which is a system embodiment corresponding to the method of embodiment 1, including a deformation maintenance initial judgment module 201, a depression maintenance judgment module 202, an ellipse maintenance judgment module 203 and a buckling maintenance judgment module 204. Among them, the deformation repair preliminary judgment module 201 is used to judge whether to repair immediately according to the distance between the edge of the deformation defect and the edge of the pipeline weld, whether there are more than two deformation defects or the distance between the edges of more than two deformation defects, and whether there is a crack or metal loss at the deformation defect; the depression repair judgment module 202 is used to judge whether to repair immediately when there is a depression deformation defect according to the maximum depth of the depression deformation, the maximum stress at the deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline; the elliptical repair judgment module 203 is used to judge whether to repair immediately when there is an elliptical deformation defect according to the maximum deformation amount, ellipticity, the position of the pipe section where the defect is located, the maximum hoop stress near the long axis of the elliptical deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline; the buckling repair judgment module 204 is used to judge whether to repair immediately according to the hoop stress and axial stress of the elliptical deformation or the depression deformation obtained by measurement, the value of the pipeline curvature radius, and the actual operating years and operating conditions of the pipeline when there is no buckling deformation defect in the pipeline, but local elliptical or concave deformation occurs with a certain bending deformation.

[0099] Further, preferably but not restrictively, the system of this embodiment may also include a buckling life prediction module 205, which is used to predict the buckling deformation life by calculating the obtained stress fluctuation number data when the buckling repair judgment module determines that no immediate repair is required.

[0100] This embodiment corresponds to the deformed pipeline maintenance determination method of Embodiment 1, and thus can achieve the same technical effect as Embodiment 1.

[0101] Example 3

[0102] This embodiment provides a non-transitory (non-volatile) computer storage medium, which stores computer executable instructions. The computer executable instructions can execute the method in the above-mentioned embodiment 1 and achieve the same technical effect. The method specifically includes the following steps: A. judging whether to perform maintenance immediately according to the distance between the edge of the deformation defect and the edge of the pipeline weld, whether there are two or more deformation defects or the distance between the edges of two or more deformation defects, and whether there are cracks or metal loss at the deformation defect; B. judging whether to perform maintenance immediately according to the maximum depth of the concave deformation, the maximum stress at the deformation defect obtained by measurement, and the actual service life and service status of the pipeline when there is a concave deformation defect; C. judging whether to perform maintenance immediately according to the maximum deformation amount, ovality, the pipe section position where the defect is located, the maximum hoop stress near the long axis of the elliptical deformation defect obtained by measurement, and the actual service life and service status of the pipeline when there is an elliptical deformation defect; D. judging whether to perform maintenance immediately according to the hoop stress and axial stress of the elliptical deformation or concave deformation obtained by measurement, the value of the pipeline curvature radius, and the actual service life and service status of the pipeline when there is no buckling deformation defect in the pipeline, but local elliptical or concave deformation occurs and is accompanied by a certain bending deformation; E. judging whether to perform maintenance immediately according to the hoop stress and axial stress of the elliptical deformation or concave deformation obtained by measurement, the value of the pipeline curvature radius, and the actual service life and service status of the pipeline when it is judged in step D that no immediate maintenance is required, predicting the buckling deformation life by calculating the stress fluctuation number data obtained.

[0103] Example 4

[0104] This embodiment provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the methods described in the above aspects and achieves the same technical effects.

[0105] Example 5

[0106] Figure 76 is a hardware structure diagram of the electronic device for determining the repair of a deformed pipeline in this embodiment. The device includes one or more processors 610 and a memory 620. Taking one processor 610 as an example, the device may also include: an input device 630 and an output device 640.

[0107] The processor 610 , the memory 620 , the input device 630 , and the output device 640 may be connected via a bus or in other ways.

[0108] The memory 620 is a non-transitory computer-readable storage medium that can be used to store non-transitory software programs, non-transitory computer executable programs, and modules. The processor 610 executes various functional applications and data processing of the electronic device by running the non-transitory software programs, instructions, and modules stored in the memory 620, that is, the processing method of the above method embodiment is implemented.

[0109] The memory 620 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data, etc. In addition, the memory 620 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 620 may optionally include a memory remotely arranged relative to the processor 610, and these remote memories may be connected to the processing device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0110] The input device 630 can receive input digital or character information and generate signal input. The output device 640 can include a display device such as a display screen.

[0111] The one or more modules are stored in the memory 620, and when executed by the one or more processors 610, the following steps are performed: A. judging whether to perform repair immediately according to the distance between the edge of the deformation defect and the edge of the pipeline weld, whether there are two or more deformation defects or the distance between the edges of two or more deformation defects, and whether there are cracks or metal loss at the deformation defect; B. judging whether to perform repair immediately according to the maximum depth of the concave deformation, the maximum stress at the deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline when there is an elliptical deformation defect; C. judging whether to perform repair immediately according to the maximum stress obtained by calculation when there is an elliptical deformation defect; The maximum deformation, ovality, location of the pipe section where the defect is located, the maximum hoop stress near the long axis of the elliptical deformation defect obtained by measurement, and the actual service life and operating conditions of the pipeline are used to determine whether immediate maintenance is required; D. When the pipeline has not yet developed a buckling deformation defect, but has a local elliptical or concave deformation accompanied by a certain bending deformation, determine whether immediate maintenance is required based on the measured hoop stress and axial stress of the elliptical or concave deformation, the value of the pipeline curvature radius, and the actual service life and operating conditions of the pipeline; E. When it is determined in step D that no immediate maintenance is required, the buckling deformation life is predicted by calculating the stress fluctuation number data obtained.

[0112] The above product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the methods provided by other embodiments of the present invention.

[0113] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0114] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0115] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A method for determining the maintenance of a deformed pipeline, characterized in that: After the pipeline is excavated, the maintenance decision is made, including the following steps: A. Determine whether to repair immediately based on the distance between the edge of the deformation defect and the edge of the pipeline weld, whether there are two or more deformation defects or the distance between the edges of two or more deformation defects, and whether there are cracks or metal loss at the deformation defect; B. When there is a concave deformation defect, determine whether to repair it immediately based on the maximum depth of the concave deformation, the maximum stress at the deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline; C. When there is an elliptical deformation defect, determine whether to repair it immediately based on the calculated maximum deformation, ellipticity, the location of the pipe section where the defect is located, the measured maximum hoop stress near the long axis of the elliptical deformation defect, and the actual operating years and operating conditions of the pipeline; D. When the pipeline has not yet developed buckling deformation defects, but has local elliptical or concave deformation accompanied by a certain degree of bending deformation, determine whether to perform immediate maintenance based on the measured annular stress and axial stress of the elliptical or concave deformation, the value of the pipeline curvature radius, and the actual operating years and operating conditions of the pipeline.

2. The method for determining the repair of a deformed pipeline according to claim 1, characterized in that: The method further comprises the steps of: E. When it is determined in step D that no immediate maintenance is required, the buckling deformation life is predicted by calculating the stress fluctuation number data obtained.

3. The method for determining the repair of a deformed pipeline according to claim 1, characterized in that: In the step A, when the distance between the edge of the deformation defect and the edge of the pipeline weld is less than or equal to 10 times the pipeline wall thickness, it is determined that immediate repair is required; otherwise, when there are more than two deformation defects or the distance between the edges of more than two deformation defects is less than or equal to 100 times the pipeline wall thickness, it is determined that immediate repair is required; otherwise, when there are cracks or metal loss at the deformation defect, it is determined that immediate repair is required.

4. The method for determining the repair of a deformed pipeline according to claim 1, characterized in that: The step B is specifically as follows: when the maximum depth of the concave deformation is ≥6%D, where D is the pipe diameter, it is determined that repair is required immediately; otherwise, the safety stress σ at the deformation defect is calculated. s , and the maximum stress σ at the deformation defect is measured by multi-division method. When σ / σ s ≥k, it is judged that maintenance should be carried out immediately. s <k, it is judged that no immediate maintenance is needed, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1.

5. The method for determining the repair of a deformed pipeline according to claim 4, characterized in that: The multi-section method adopts the dichotomy method, the quarter method or the octave method; the measuring equipment adopts the dual-probe electromagnetic ultrasonic measurement.

6. The method for determining the repair of a deformed pipeline according to claim 4, characterized in that: The safety stress σ at the deformation defect s The specific calculation method is as follows: If the defect is in the straight pipe section: Among them, MAOP is the maximum allowable operating pressure of the pipeline at the defect, D is the outer diameter of the pipeline at that location, and δ is the wall thickness of the pipeline at that location; If the defect is located at the bend section: Where m is the correction coefficient and R is the radius of curvature of the curved pipe section.

7. The method for determining the repair of a deformed pipeline according to claim 1, characterized in that: The step C is specifically as follows: when the maximum deformation A ≥ 6%, it is determined that immediate maintenance is required; otherwise, it is determined whether the ovality B meets the immediate maintenance conditions, and when the elliptical deformation defect is located in the straight pipe section and the ovality B ≤ 1%, it is determined that no immediate maintenance is required, or, when the elliptical deformation defect is located in the curved pipe section and the ovality B ≤ 2.5%, it is determined that no immediate maintenance is required; otherwise, the maximum hoop stress σ near the major axis of the elliptical deformation defect and the safety stress value σ at the vertex of the major axis of the ellipse are further calculated. s ratio.

8. The method for determining the repair of a deformed pipeline according to claim 7, characterized in that: When σ / σ s ≥k, it is judged that maintenance should be carried out immediately. s <k, it is judged that no immediate maintenance is needed, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1.

9. The method for determining the repair of a deformed pipeline according to claim 7, characterized in that: Safety stress value σ at the vertex of the major axis of the ellipse s The specific calculation method is as follows: If the defect is in the straight pipe section: Among them, MAOP is the maximum allowable operating pressure of the pipeline at the defect, D min is the minimum outer diameter of the elliptical deformation, D max is the maximum outer diameter at the elliptical deformation point, and δ is the pipe wall thickness at that point; If the defect is located at the bend section: Among them, m is the correction coefficient, R is the radius of curvature of the curved pipe section, and D is the outer diameter of the pipe before deformation.

10. The method for determining the repair of a deformed pipeline according to claim 1, characterized in that: The step D is specifically as follows: when the local elliptical or concave deformation is judged not to require immediate repair, and the pipe curvature radius R obtained by measurement is ≤ 200D, the hoop stress σ of the elliptical deformation or concave deformation is measured respectively. h and axial stress σ z ; when Then it is determined that immediate repair is required; when It is judged that no immediate maintenance is required; Wherein, k is a value set according to the actual operating life and operating conditions of the pipeline, 0<k≤1.

11. The method for determining the repair of a deformed pipeline according to claim 2, characterized in that: The stress fluctuation times in step E are used to characterize the buckling deformation life N, and the specific calculation method is: in, K2=1+50B; in, In the formula, A is the buckling deformation life adjustment factor, which is determined according to the service life of the pipeline; σ b is the tensile strength of the pipeline material, MPa; K1 is the concave deformation factor, dimensionless; K2 is the elliptical deformation factor, dimensionless; h is the maximum depth of the concave deformation, mm; δ is the pipe wall thickness, mm; D is the outer diameter of the pipeline, mm; B is the ellipticity of the pipeline; σ cr is the critical stress of buckling deformation, MPa; σ h is the maximum hoop stress, MPa; K3 is the strength factor, MPa, which is between 800-1700 according to the pipeline model; ε cr is the critical strain, according to the tensile strength of the pipeline material σ b The value is taken in different intervals; n is the strain hardening exponent, which is between 0.2-0.6 and obtained through measurement.

12. A deformed pipeline maintenance determination system, characterized in that: After the pipeline is excavated, maintenance decisions are made, including: The deformation repair preliminary judgment module is used to determine whether to repair immediately based on the distance between the edge of the deformation defect and the edge of the pipeline weld, whether there are two or more deformation defects or the distance between the edges of two or more deformation defects, and whether there are cracks or metal loss at the deformation defect; A dent repair judgment module is used to determine whether to immediately repair a dent when a dent is present, based on the maximum depth of the dent, the maximum stress at the deformation defect obtained by measurement, and the actual operating years and operating conditions of the pipeline. The ellipse repair judgment module is used to determine whether to repair immediately when there is an ellipse deformation defect based on the calculated maximum deformation, ellipticity, the pipe section location where the defect is located, the measured maximum hoop stress near the long axis of the ellipse deformation defect, and the actual operating years and operating conditions of the pipeline; The buckling repair judgment module is used to determine whether to repair immediately when the pipeline has not yet developed buckling deformation defects but has local elliptical or concave deformation accompanied by a certain bending deformation, based on the measured annular stress and axial stress of the elliptical deformation or concave deformation, the value of the pipeline curvature radius, and the actual operating years and operating conditions of the pipeline.

13. The deformed pipeline repair determination system according to claim 12, characterized in that: Also includes: The buckling life prediction module is used to predict the buckling deformation life by calculating the stress fluctuation number data when the buckling repair judgment module determines that no immediate repair is required.

14. An electronic device for determining the repair of a deformed pipeline, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the deformed pipeline maintenance determination method according to any one of claims 1 to 11.

15. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable the computer to execute the deformed pipeline maintenance determination method according to any one of claims 1 to 11.

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