Pipe inner wall pigging damage simulation experiment device and method and terminal thereof

Abstract

The invention discloses a pipe inner wall pigging damage simulation experiment device and method and a terminal, and relates to the technical field of petroleum and natural gas pipeline pigging testing, the pipe inner wall pigging damage simulation experiment device comprises a guide rail, and a support is further provided with a contact stress detection section and a main test section which are connected; the guide rail is provided with a movable sliding block in sliding connection, the movable sliding block is provided with a pipe cleaner, and the movable sliding block is used for driving the pipe cleaner to move on the contact stress detection section and the main test section; a deformation stress strain gauge is arranged in the contact stress detection section; a to-be-tested pipeline slice test piece matched with the pipe cleaner in size is fixed on the main test section, the to-be-tested pipeline slice test piece is a pipeline part sectioned in the axial direction of the to-be-tested pipeline slice test piece, and the to-be-tested pipeline slice test piece is arranged in the length direction of the main test section; fluid containing solid particles is sprayed and coated on the inner sides of the main test section and the to-be-tested pipeline slice test piece. According to the invention, on the premise of considering various influence factors in the whole pipe cleaning process, a technical means for efficiently, comprehensively and accurately carrying out pipe cleaning damage experiment simulation on the inner wall of the pipe is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of pigging and testing for oil and gas pipelines, and particularly relates to a device and method for simulating pigging damage on the inner wall of a pipeline and a terminal thereof. Background Art

[0002] With the further development of oil and gas resources, the role of gathering and transportation pipelines in the oil and gas industry is becoming increasingly important. At the same time, the safety maintenance of pipeline transportation has gradually attracted attention.

[0003] Currently, using devices such as pigs or internal detectors to conduct pigging and detection on pipelines has become an essential process in pipeline safety operation management. When a pipeline is built, it is necessary to use a pig to remove the accumulated liquid in the pipeline and impurities left by pipeline construction, and operate an internal detector to conduct baseline detection. During the daily operation of the pipeline, it is necessary to use a pig to remove dirt such as wax deposits and accumulated liquid formed by the long-term transportation medium inside the pipeline. At the same time, it is also necessary to regularly conduct pigging detection using intelligent pigs in order to detect different degrees of damage to the pipeline caused by some internal (corrosion and cracks in the pipeline) or external (geological disasters such as earthquakes and landslides) reasons, and promptly discover and handle these damages to avoid the occurrence of serious accidents.

[0004] The pigging process is to contact and seal the inner wall of the pipeline through the interference fit between the pig and the inner wall of the pipeline, form a pressure difference to provide power, and generate a friction and cutting process during contact to remove impurities such as free water, dirt, and solid deposits on the inner wall of the pipeline. During this process, partial wear and scratches will inevitably occur on the inner wall of the pipeline. Research shows that although the wear and damage on the inner wall of the pipeline will not directly cause functional damage to the pipeline, they will induce and accelerate the generation and development of corrosion inside the pipeline. Some scratches and wear on the inner wall may quickly develop into pitting pits, and mechanical damage and cracks may continue to form intergranular stress corrosion cracks, especially for some pipelines with corrosion-resistant inner coatings, corrosion-resistant alloy linings, and sulfur-containing pipelines, which will pose serious safety risks. Therefore, understanding the damage condition during the pigging process of the inner wall of the pipeline is of great significance for the safe and stable operation of the pipeline.

[0005] The damage that may be incurred by the inner wall of a pipeline during the cleaning process is affected by many factors, including the inner wall, the material of the cleaning device, the mutual movement conditions of the cleaning device (speed, surface condition, impact size, pipeline position and contact stress, etc.), the pipeline structure and fluid medium characteristics, etc., and is usually studied and evaluated using experimental schemes. At present, the commonly used friction and wear tester can only simulate the high-frequency and repeated friction process between the test pieces. It is not very targeted when used to simulate the pipeline cleaning process and cannot guarantee the accuracy of the experimental results; the full-scale pulling test uses a full-scale pipeline and cleaning device, which cannot simulate and verify the operation of the cleaning device when passing through the bend, and the test efficiency is low. It is mainly used in the performance test of the detector. The process of replacing the test pipe section is complicated, time-consuming and costly; the hydraulic driven cleaning experimental device has unfavorable factors such as high requirements for experimental equipment, complex process operation and difficult data detection, high cost and susceptibility to external conditions. The existing public technology and patents cannot provide a technical means to efficiently, comprehensively and accurately carry out the simulation of the inner wall cleaning damage experiment under the premise of considering various influencing factors of the whole cleaning process.

[0006] In summary, there is an urgent need for an experimental device and method that can efficiently, comprehensively and accurately complete pipeline inner wall cleaning damage experiments and evaluations. Summary of the invention

[0007] The present invention aims to solve the deficiencies of the prior art and to provide a pipe inner wall cleaning damage simulation experimental device and method and terminal thereof, which are used to efficiently, comprehensively and accurately carry out pipe inner wall cleaning damage experimental simulation technical means under the premise of considering various influencing factors of the whole cleaning process.

[0008] The present invention is achieved through the following technical solutions:

[0009] A pipe inner wall cleaning damage simulation experimental device comprises a guide rail located on a bracket, wherein the bracket is also provided with a contact stress detection section and a main test section connected thereto;

[0010] The guide rail is provided with a slidingly connected moving slider, the moving slider is provided with a pipe cleaning device, and the moving slider is used to drive the pipe cleaning device to move on the contact stress detection section and the main test section;

[0011] The contact stress detection section is provided with a deformation stress strain gauge, and the deformation stress strain gauge is used to detect the vertical compressive stress of the pig on the contact stress detection section;

[0012] The main test section is fixed with a pipe slice specimen to be tested that matches the size of the pipe cleaner. The pipe slice specimen to be tested is a pipe section cut along its own axial direction. The pipe slice specimen to be tested is arranged along the length direction of the main test section.

[0013] The surfaces of the main test section and the pipe slice specimen to be tested are sprayed and coated with a fluid containing solid particles.

[0014] Compared with the prior art, the existing public technologies and patents cannot provide a technical means for efficiently, comprehensively and accurately conducting experimental simulations of pipe inner wall cleaning damage under the premise of considering various influencing factors of the entire cleaning process. The present invention provides a pipe inner wall cleaning damage simulation experimental device to solve the problem of the lack of technical means for efficiently, comprehensively and accurately conducting experimental simulations of pipe inner wall cleaning damage under the premise of considering various influencing factors of the entire cleaning process. The present invention can be used to identify the risk points of possible damage in the entire process of pipeline cleaning, and design indoor cleaning simulation experiments including multiple influencing factors such as pipe inner wall material, cleaning device material, cleaning device speed, and bending at different angles, so as to achieve the purpose of efficiently, comprehensively and accurately conducting experimental simulation evaluation of damage in the entire process of pipe inner wall cleaning, and provide experimental research support for the research of the cleaning process, the design of cleaning process measures and the optimization and determination of the inner wall material. The specific scheme includes a moving slider for carrying the pipe cleaner and a guide rail for sliding connection with the moving slider. The bracket is also distributed with a connected contact stress detection section and a main test section. The contact stress detection section is a smooth steel surface with a built-in deformation stress strain gauge, which can collect and record the vertical compressive stress of the pipe cleaner when it is stationary and passing normally. Therefore, the compressive stress of the pipe cleaner can be adjusted according to the detected pressure value; a pipe slice specimen to be tested that is compatible with the size of the pipe cleaner is fixed on the main test section. The pipe slice specimen to be tested is clamped and fixed by a clamping device on one side of the guide rail. The pipe slice specimen to be tested is a pipe section cut along its own axial direction, that is, an opening is left on its lower side to avoid the guide rail, which is convenient for the pipe cleaner to enter. The pipe slice specimen to be tested is arranged along the length direction of the guide rail; the main test section is provided with a contact surface environment adjustment device, which is sprayed and coated with a fluid containing solid particles on the pumping surface, that is, the nozzle continuously covers the contact medium (clean water, sand-containing liquid, oil and ultrasonic detection coupling agent, etc.) determined by the experimental conditions on the surface of the test section to create the contact surface environment required for the pipe cleaning simulation experiment. Therefore, through the above scheme, by designing an indoor pipe cleaning simulation experiment with multiple influencing factors including pipe inner wall material, pipe cleaning device material, pipe cleaning device speed, and bending pipes at different angles, the purpose of efficiently, comprehensively and accurately conducting experimental simulation evaluation of damage of the entire pipe inner wall cleaning process is achieved, which provides experimental research support for the study of the pipe cleaning process, the design of pipe cleaning process measures and the optimization of pipe inner wall materials.

[0015] In a further solution, the front end of the contact stress detection section is connected with a front transition section, the rear end of the main test section is connected with a rear transition section, the front transition section has a downhill surface, and the rear transition section has an uphill surface; there is a smooth transition between the front transition section and the contact stress detection section, and between the main test section and the rear transition section. The front transition section and the rear transition section are used to simulate the process of the pig passing in and out of the pipeline, and the smooth transition at the turning point is used to prevent the pig from jumping when passing through the turning point.

[0016] In a further solution, the heights of the front transition section, the contact stress detection section, the main test section and the rear transition section are adjustable.

[0017] In a further solution, a tension and compression sensor for detecting the friction force suffered by the pig during operation is also provided on the moving slider.

[0018] In a further solution, a clamp for clamping the test pipe slice specimen to be tested is provided on the main test section.

[0019] In a further solution, the front end of the moving slider is connected to one side of a fixed disk through a connecting rod, the other side of the fixed disk is connected to the pig, and a force sensor for detecting the pressure between the end of the pig and the inner side of the test pipe slice specimen to be tested is also provided on the moving slider. The connecting rod and the moving slider are connected by bolts, and the fixed disk and the pig are connected by bolts.

[0020] In a further solution, an experimental method for an experimental device for simulating pigging damage on the inner wall of a pipe includes the following steps:

[0021] S1: Establish a simulation model according to the structural parameters of the pig and the pipeline;

[0022] S2: Simulate the operation process of the pig according to the operation parameters of the pig and its working conditions;

[0023] S3: During the operation process of the pig, according to the change of the speed of the pig in the pipeline, and sort the operation speeds from large to small in sequence, and then record the positions of the first X operation speeds as V-1, V-2, V-3... V-X; by comparing the pipeline elevation mileage, obtain multiple pipeline elbow positions, denoted as B-1, B-2, B-3... B-Y; both X and Y are integers greater than 0;

[0024] The above positions are uniformly judged as the risk points of inner wall damage during the pigging process;

[0025] S4: Subsequently, using the stress simulation model and adopting the pig interference amount required in the actual pigging process, the velocity at each damage risk point is sequentially taken as the running velocity of the pig, and the force condition between the pig and the inner wall of the pipe during the operation of the pig in the pipe is locally simulated and calculated at the risk points;

[0026] S5: After the simulation is completed again, several stress values between the pig and the inner side of the pipe are obtained. By comparison, the maximum stress between the pig and the inner wall of the pipe is obtained and denoted as σ 应力最大位置 , and the running velocity corresponding to this stress is denoted as V 应力最大最大位置 ;

[0027] The maximum running velocity of the pig is obtained by comparison and denoted as V 速度最大位置 , and the stress corresponding to this point is denoted as σ 速度最大位置 ;

[0028] The velocity at the maximum elbow angle at the low-lying part of the V-shaped elbow of the pipe where the pig is located is denoted as V 低洼角度最大位置 , and the stress corresponding to this point is denoted as σ 低洼角度最大位置 ;

[0029] The velocity at the maximum elbow angle at the high part of the A-shaped elbow of the pipe where the pig is located is denoted as V 高处角度最大位置 , and the stress corresponding to this point is denoted as σ 高处角度最大位置 ;

[0030] S6: Subsequently, V 应力最大最大位置 , V 速度最大位置 , V 低洼角度最大位置 and V 高处角度最大位置 are sequentially set as the running velocities of the moving slider entering the main test section, and the respective corresponding stress values are set as the vertical compressive stress of the moving slider on the contact stress detection section to conduct indoor simulation tests respectively.

[0031] A further solution is that the step S4 further includes the following specific steps:

[0032] According to the physical parameters, operating parameters, risk point positions, and the calculated running velocity of the pig, combined with the elevation-mileage schematic diagram of the pigging pipeline system, using Ansys software and based on the finite volume method, a simulation prediction is carried out on the inner wall damage risk points, and the stress σ perpendicular to the inner wall of the pipe when the pig passes through and contacts the inner wall of the pipe is calculated.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] The present invention provides a simulation experimental device for pigging damage on the inner wall of a pipe, aiming to solve the problem of the lack of technical means for efficiently, comprehensively, and accurately conducting simulation experiments on pigging damage on the inner wall of a pipe considering various influencing factors in the whole pigging process. By using the present invention, the risk points of possible damage in the whole process of pipeline pigging can be identified, and indoor pigging simulation experiments including various influencing factors such as the material of the inner wall of the pipe, the material of the pigging tool, the speed of the pigging tool, and passing through elbows at different angles can be designed, so as to achieve the purpose of efficiently, comprehensively, and accurately conducting simulation evaluation of the damage in the whole process of pigging on the inner wall of the pipe, and provide experimental research support for the research of the pigging process, the design of pigging process measures, and the optimization and determination of the inner wall material of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0036] Figure 1 is a partial structural schematic diagram of a simulation experimental device provided by the present invention;

[0037] Figure 2 is a side view of a simulation experimental device provided by the present invention;

[0038] Figure 3 is a schematic diagram of the installation structure of a pigging tool provided by the present invention.

[0039] Marks in the drawings and corresponding component names:

[0040] 1 - Guide rail, 2 - Moving slider, 3 - Pigging tool, 4 - Force sensor, 5 - Fixed disk, 6 - Connecting rod, 7 - Bolt, 8 - Motor, 9 - Specimen of pipeline slice to be experimented, 10 - Support. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the purpose, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and the drawings. The illustrative embodiments and descriptions thereof of the present invention are only used to explain the present invention and do not limit the present invention.

[0042] Embodiment 1:

[0043] This Embodiment 1 provides a simulation experimental device for pigging damage on the inner wall of a pipe, as Figures 1 - 3 shown.

[0044] A guide rail 1 is arranged on the horizontal support 10, and a moving slider 2 is connected to the guide rail 1. The moving slider 2 can be bolted to fix the pigging tool 3, and different types of pigging tools 3 (steel brushes, leather cups, straight plates, etc.) can be fixedly centered.

[0045] A pipeline specimen fixing platform is arranged in the middle of the support 10. The platform is divided into 4 experimental areas from front to back. Area 1 is the front transition section, Area 2 is the contact stress detection section, Area 3 is the main experimental section, and Area 4 is the rear transition section.

[0046] Both ends of the pipeline specimen fixing platform are the front and rear transition sections of Areas 1 and 4. The transition section is a steel inclined plane with an adjustable slope. The length is 300 mm, and the height of the slope top can be adjusted within the range of 0 - 50 mm. The bottom height of the inclined plane should be adjusted to be the same as the heights of the static load test section and the main experimental pipe section for smooth transition.

[0047] Area 2, the contact stress detection section, has a smooth steel surface and is internally equipped with deformation stress and strain gauges, which can collect and record the vertical compressive stress when the pigging tool 3 is stationary and passes normally. The height of Area 2 can be adjusted as a whole, and the height of Area 2 should be the same as the heights of the front transition pipe of Area 1 and the main experimental section of Area 3 for smooth transition.

[0048] Area 3, the main experimental section, can fix the pipeline slice specimen 9 with a length less than 0.5 m to be tested through a steel bolt gripper. The overall height of Area 3 can be adjusted within the range of 0 - 50 mm, which is the same as the height of Area 4, the rear transition section, for smooth transition.

[0049] The experimental pipeline slice specimen is axially cut from a pipeline with the same material as the actual pigging process. The arc length should be greater than 30 mm and less than 150 mm. The specimen length is less than 1 m and should be greater than 10 cm. The cutting position is determined according to specific experimental conditions and can include special positions such as welds.

[0050] In Area 3, the main experimental section, a contact surface environment adjustment device is set up. By pumping the contact surface medium, the contact medium (clean water, sand - containing liquid, oil, ultrasonic testing coupling agent, etc.) determined by the experimental conditions is continuously covered on the surface of the experimental section in Area 3 through a nozzle to create the contact surface environment required for the pigging simulation experiment. A baffle is set around the platform, and a water pool is set below to collect the experimental waste liquid.

[0051] The tension - compression sensor is connected to the connecting shaft of the pigging tool 3 fixed to the moving slider 2, and can obtain the friction force data when the pigging tool 3 is running.

[0052] A high - speed microscope photographing camera is set on the side of the experimental platform, which can photograph and record the deformation process of the pigging tool 3 and the contact process between the pigging tool 3 and the pipe wall during the process of the pigging tool 3 passing through the main experimental pipe section.

[0053] The front end of the movable slider 2 is connected to one side of the fixed disk 5 through a connecting rod 6, and the other side of the fixed disk 5 is connected to the pipe cleaner 3. The movable slider 2 is also provided with a force sensor 4 for detecting the pressure between the end of the pipe cleaner 3 and the inner side of the pipe slice specimen 9 to be tested. The connecting rod 6 and the movable slider 2 are connected by bolts, and the fixed disk 5 and the pipe cleaner 3 are connected by bolts.

[0054] Specific experimental methods:

[0055] The material, pipe diameter, etc. of the pipe cleaner 3 are determined according to the actual pipe cleaning working conditions. The pipe cleaner 3 is a full-size pipe cleaner 3 installed and fixed on the movable slider 2 .

[0056] The material of the inner wall of the pipeline is determined, and a pipeline with the same diameter as the pipe cleaner 3 is cut to obtain the sliced ​​specimen to be tested.

[0057] According to different cleaning process characteristics, the contact surface characteristics between the cleaning device 3 and the inner wall of the pipeline are determined, and the corresponding wet friction (clean water, sand-containing water, ultrasonic coupling medium, etc.) and dry friction surface characteristics of the test piece experimental platform are determined by using a nozzle.

[0058] During the simulation experiment, the structural and physical parameters of the pipeline body (pipe length, pipe diameter, wall thickness, etc.), the structural and physical parameters of the pig 3 (pipe diameter, length, pig 3 type, etc.) and the operating parameters (pipeline operating pressure, flow, temperature, etc.) are obtained.

[0059] According to the physical parameters and operating parameters, the Olga software is used to simulate and predict the specific pigging conditions, and the operating speed of the pig 3 in the pipeline is set. According to the speed change and the bend of the pipeline, the first X operating speeds with the largest operating speeds are taken and marked respectively; and at the bend position of the pipeline, since the speed change is large, it will also be a potential damage risk point, so several bend positions can also be marked; the above marked points are used as possible inner wall damage risk points during the pigging process.

[0060] After obtaining the above damage risk points, according to the physical parameters and operating parameters, the positions of the risk points and the calculated running speeds of the pig 3, a stress simulation model is used, and the pig interference required in the actual pigging process is adopted. The speed at each damage risk point is used as the pig running speed in turn. Combined with the elevation-mileage schematic diagram of the pigging pipeline system, the inner wall damage risk points are simulated and predicted by the Ansys software based on the finite volume method, and the stress value between the pig 3 and the inner side of the pipeline when it contacts the inner wall of the pipe when passing through is calculated; and the following four simulation conditions are obtained:

[0061] (1) By comparison, the maximum stress between the pig and the inner wall of the pipe is obtained, denoted as σ 应力最大位置 The running speed corresponding to this stress is recorded as V 应力最大最大位置 ;

[0062] (2) Compare to obtain the maximum running speed of the pig, denoted as V 速度最大位置 , and the corresponding stress at this point is denoted as σ 速度最大位置 ;

[0063] (3) Denote the speed at the maximum elbow angle at the low-lying part of the V-shaped elbow of the pipeline where the pig (3) is located as V 低洼角度最大位置 , and the corresponding stress at this point is denoted as σ 低洼角度最大位置 ;

[0064] (4) Denote the speed at the maximum elbow angle at the high part of the A-shaped elbow of the pipeline where the pig (3) is located as V 高处角度最大位置 , and the corresponding stress at this point is denoted as σ 高处角度最大位置 ;

[0065] After obtaining the above four conditions, conduct indoor simulation tests on the above four conditions respectively, that is, set the corresponding speed as the running speed of the moving slider 2 entering the main test section, and set the corresponding stress as the vertical compressive stress of the moving slider 2 on the contact stress detection section. Therefore, through the indoor simulation tests of the above four conditions, after comparing the results, the position with the maximum damage can be obtained.

[0066] Example 2:

[0067] Based on Example 1, this Example 2 provides an experimental method for a pipe inner wall pigging damage simulation experimental device, including the following specific operation methods:

[0068] Obtain the structural physical parameters (pipe length, pipe diameter, wall thickness, etc.) of the simulated object pipeline body, the structural physical parameters (pipe diameter, length, type of pig 3, etc.) of the pig 3, and the operating parameters (pipeline operating pressure, flow rate, temperature, etc.) during the simulated pigging experiment.

[0069] According to the physical parameters and operating parameters, use olga software to simulate and predict the running speed of the pig 3 in the pipeline under specific pigging working conditions.

[0070] Open PVTSIM software, select SRK in the Equation of State in the title bar, click New Plus Fluid in Fluid Management to enter the Enter New Fluid interface, and input the gas source component information and gas quality data.

[0071] Click Flash in Simulations to enter the Flash interface, select the Saturate water radio box, input the gas source pressure and temperature, and complete the addition of saturated water for the gas quality components.

[0072] Click on OLGA in Interfaces to enter the PVT tables to OLGA interface. Enter a minimum pressure of 0.01 bara, a maximum pressure of 200 bara, a minimum temperature of -50 °C, and a maximum temperature of 100 °C in Pressure and Temperature. Click on Output File to set the output path for the tab file, and click OK to complete the output of the component file.

[0073] Open the OLGA software, select Basic in Categories, and click Create to complete the creation of the model file.

[0074] In the Model Browser interface, click on Structure and set materials such as steel, insulation layer, anti-corrosion layer, and soil according to the actual situation. Click on MATERIAL to set the heat capacity, thermal conductivity, and density of the materials respectively. Click on WALL to set the pipe shell, assemble the materials that have been set in MATERIAL, and complete the thickness setting of each layer in THICKNESS after assembly.

[0075] Click on FILES in Case Definition, click on the button next to PVTFILE to enter the File order interface, and click on Browse to select the save path of the component file to complete the input of the component file.

[0076] Click on INTEGRATION in Case Definition, enter the simulation time in the ENDTIME box, and set the maximum and minimum iteration step sizes in the MAXDT and MINDT boxes.

[0077] Drag and drop the Mass node in Components to create a gas source node, drag and drop the Pressure node to create a distribution node, and drag and drop Flowpath to create a pipeline component to connect the Mass node and the Pressure node.

[0078] Click on the gas source node to set the gas source parameters. Set the gas source temperature in TEMPERATURE in the General box, and select the input component in the FLUID box. Enter the gas source flow rate in the STDFLOWRATE box in Standard conditions, select GAS in the PHASE drop-down option box. If there is free water, set the liquid-gas ratio in WGR.

[0079] Click on the distribution node to set the parameters, set the node pressure in PRESSURE, and select the input component in the FLUID box.

[0080] Double-click on the pipeline component to enter the Flowpath geometry data setting interface. Input the pipe length, elevation, pipe diameter, and wall thickness data for each pipe section of the pipeline, and select the already entered shell data in Wall to complete the pipeline information entry.

[0081] Click on Flow Component, right-click on FLOWPATH, and select Add. Set the component addition position in Position under Positions in the expansion box. Click on Positions, set the pipe section where the component is added in the PIPE box, and select the specific position of the pipe section where the component is located in SECTION.

[0082] Click on Flow Component, right-click on FLOWPATH, and select Add. Add the pig cleaning element 3 in FA-models in the expansion box. Click on the pig cleaning element 3 to enter the pig cleaning element 3 setting interface. Set the input time of the pig cleaning element 3 in INSERTTIME and the input position of the pig cleaning element 3 in LAUNCHPOSITION. Set parameters such as the mass, diameter, and friction coefficient of the pig cleaning element 3 in Properties.

[0083] Click on Output in Flow Component to set the output parameters. Click on Position in TRENDDATA, delete the values in PIPE and SECTION, so as to output the parameters of the entire pipeline. Select the observation data of the pig cleaning element 3 such as the speed UPIG of the pig cleaning element 3, the position ZPIG of the pig cleaning element 3 in the pipeline, and the pressure difference DPPIG before and after the pig cleaning element 3 in the VARIABLE in the General box.

[0084] After the settings are completed, click Verify to verify the model validity. After verification is correct, click Run Batch to perform simulation calculations. After the calculations are completed, click Trend Plot to output the image results of the operation data of the pig cleaning element 3.

[0085] Select 5 elbow positions (A, B, C, D, E) with relatively high speeds during the whole process of pipeline pig cleaning as the possible risk points of pipe inner wall damage during the whole process of pig cleaning, and obtain the running speed V( A、B、C、D、E ) of the pig cleaning element 3 at each point, m / s.

[0086] The control module sets the speed of the servo motor 8 driving the slider 2 and the pig cleaning element 3 to be V when they contact the pipeline slice specimen 9 to be tested, and maintains this speed until the pig cleaning element 3 passes through the main experimental pipe section and enters the post-transition pipe section.

[0087] Based on the physical parameters, operating parameters, the location of risk points, and the calculated running speed of the pig 3, combined with the elevation-mileage schematic diagram of the pigging pipeline system, the inner wall damage risk points are simulated and predicted by Ansys software based on the finite volume method.

[0088] In the Ansys Workbench software, select LS-DYNA in the analysis systems on the left and drag it to the middle workbench to create an independent system.

[0089] In the independent LS-DYNA toolbar, select "Engineering Data", add the materials used for model establishment, and set the property parameters of the materials, including the density, Young's modulus, Poisson's ratio, and yield strength of the pipeline material; the density, Young's modulus, material constants of the Mooney-Rivlin parameters, C01, and the incompressibility parameter of the pigging material. After setting, return to the project window.

[0090] Right-click on "Geometry" and edit the geometry in DesignModeler. Select a plane for sketching, draw the pipeline diameter and axis according to the dimensions, and use functions such as extrusion, rotation, and sweeping to create a three-dimensional pipeline geometry. When creating, select thin / surface, select the pipeline surface, and create the pipeline wall thickness according to the retention direction.

[0091] Using the same method as in step 3, establish a new coordinate and plane at the pipeline inlet, draw a 1 / 4 cross-section of the pig 3, and use rotation to rotate it around the central axis to form a geometry. Set the diameter of the pig 3 according to the interference amount of the pig 3.

[0092] In "Model", select the geometries created in steps 3 and 4 respectively, and assign the material parameters established in step 2 to the pipeline and pigging materials.

[0093] Insert contact regions and geometric body interaction behaviors in the connection. The contacting geometric body is set as the pigging material, and the target geometric body is the pipeline. Define the friction contact type, set the friction coefficient, the contact behavior is symmetric, and select the generalized Lagrangian formula for calculation.

[0094] Use the explicit method for linear mesh division. The mesh size is adaptively adjusted, and the size resolution is 2 to obtain a higher mesh quality.

[0095] In "Settings", add fixed supports to the outer wall surface and both ends of the pipeline, and set a pressure load along the pipeline direction at the rear end of the pig 3. The load data is judged according to the pressure difference and can be adjusted according to the simulation results.

[0096] Perform analysis settings, with the end time of the setting step being 0.4 s, the solver type being only structural analysis, the solver precision being single precision, the formula using Lagrangian coefficient calculation, the enhanced composite damage model being used in composite control, and stress and stress files of flexible components being selected in output control.

[0097] Insert result types in "6 Solve", such as the deformation, stress, contact parameters of the target geometry, and other custom results, and judge risk points during the pigging process. The normal contact stress σ between the pig 3 and the inner wall of the pipeline f ( A、B、C、D、E ), MPa;

[0098] Compare the normal contact stress σ f ( A、B、C、D、E ) The position with the largest value is the location with the greatest risk of inner wall damage during the entire pipeline pigging process.

[0099] Set the speed of the experimental moving slider 2 to the position with the greatest risk V.

[0100] Adjust the height of the contact stress detection section in Area 2 to ensure that the stress perpendicular to the inner wall of the pipe collected when the pig passes through the contact stress detection pipe section is equal to σ at the position with the greatest risk, MPa.

[0101] Cut the pipeline that meets the experimental conditions, machine and manufacture experimental specimens that meet the test conditions, and fix them to the main experimental section in Area 3.

[0102] Fix the pig 3 that meets the test conditions to the moving slider 2.

[0103] Adjust Areas 1, 2, 3, and 4 to ensure that the heights of each area are the same and the transition is smooth.

[0104] Adjust the contact surface environment adjustment device and set the contact surface conditions during the experiment.

[0105] The servo motor 8 is connected to the sprocket. The servo motor 8 rotates at high speed, driving the moving slider 2 and the pig 3 to accelerate forward and move in a straight line, simulating the sliding of the pig 3 in the pipeline. When the moving slider 2 and the pig 3 move to the position of the specimen experimental platform, the moving speed reaches the preset speed (1, 3, 5, 8...). The pig 3 makes contact with the experimental specimen fixed between the front transition pipeline and the main experimental pipeline through the front transition pipeline, simulating the friction, cutting, and other damage processes of the pig 3 on the inner wall of the pipe. After passing through the rear transition pipe section, the servo motor 8 immediately starts to decelerate, that is, in the second half of the track, the speed is reduced to zero.

[0106] During the experiment, the servo motor 8 can be controlled through the control box, the speed of the driving sprocket can be adjusted, and at the same time, the running speed of the pig 3 can be adjusted to realize the simulation experiment of the pig 3 under multiple working conditions.

[0107] The tension and compression sensor is connected to the connecting shaft of the pigging tool 3 fixed to the moving slider 2, and the friction data received by the pigging tool 3 during operation can be obtained.

[0108] A high-speed microscope photographing camera is arranged on the side of the experimental platform, which can photograph and record the pigging tool 3 passing through the main experimental pipe section, and record the deformation process of the pigging tool 3 and the contact process between the pigging tool 3 and the pipe wall.

[0109] Embodiment 3:

[0110] In some exemplary embodiments, the present embodiment further provides a pipe inner wall pigging damage simulation experimental device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it realizes the experimental method of a pipe inner wall pigging damage simulation experimental device, which is the minimum technical solution for achieving the purpose of "efficiently, comprehensively, and accurately carrying out the pipe inner wall pigging damage experimental simulation technology means under the premise of considering various influencing factors in the whole pigging process" as in Embodiment 1.

[0111] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0112] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be realized by computer program instructions, and the combination of the processes and / or blocks in the flowchart and / or block diagram can also be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0113] These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device realizes the functions in Figure 1 one process or multiple processes and / or blocks Figure 1The functions specified in one or more boxes.

[0114] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide for implementing in the process Figure 1 One process or multiple processes and / or boxes Figure 1 The steps of the functions specified in one or more boxes.

[0115] Those of ordinary skill in the art can understand that all or part of the steps in implementing the above facts and methods can be completed by instructing relevant hardware through a program. The program involved or the said program can be stored in a computer-readable storage medium. When the program is executed, it includes the following steps: At this time, the corresponding method steps are introduced. The storage medium can be ROM / RAM, magnetic disk, optical disk, etc.

[0116] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipe inner wall cleaning damage simulation experimental device, It is characterized in that It comprises a guide rail (1) located on a bracket (10), wherein the bracket (10) is also provided with a contact stress detection section and a main test section connected to each other; The guide rail (1) is provided with a slidingly connected moving slider (2), the moving slider (2) is provided with a pipe cleaning device (3), and the moving slider (2) is used to drive the pipe cleaning device (3) to move on the contact stress detection section and the main test section; The contact stress detection section is provided with a deformation stress strain gauge, and the deformation stress strain gauge is used to detect the vertical compressive stress of the pipe cleaning device (3) on the contact stress detection section; A pipe slice specimen (9) to be tested and having a size matching that of the pipe cleaner (3) is fixed on the main test section. The pipe slice specimen (9) to be tested is a pipe section cut along its own axial direction. The pipe slice specimen (9) to be tested is arranged along the length direction of the main test section. The surfaces of the main test section and the pipe slice specimen (9) to be tested are sprayed and coated with a fluid containing solid particles.

2. A pipe inner wall cleaning damage simulation experimental device according to claim 1, It is characterized in that The front end of the contact stress detection section is provided with a connected front transition section, and the rear end of the main test section is provided with a connected rear transition section, the front transition section has a downslope surface, and the rear transition section has an upslope surface; there is a smooth transition between the front transition section and the contact stress detection section, and between the main test section and the rear transition section.

3. A pipe inner wall cleaning damage simulation experimental device according to claim 1, It is characterized in that The heights of the front transition section, the contact stress detection section, the main test section and the rear transition section are adjustable.

4. A pipe inner wall cleaning damage simulation experimental device according to claim 1, It is characterized in that The movable slider (2) is also provided with a tension and compression sensor for detecting the friction force applied to the pipe cleaning device (3) during operation.

5. The pipe inner wall cleaning damage simulation experimental device according to claim 1, It is characterized in that The main test section is provided with a clamp for clamping the pipe slice specimen (9) to be tested.

6. A pipe inner wall cleaning damage simulation experimental device according to claim 1, It is characterized in that The front end of the movable slider (2) is connected to one side of a fixed plate (5) via a connecting rod (7), and the other side of the fixed plate (5) is connected to the pipe cleaner (3). The movable slider (2) is also provided with a force sensor (4) for detecting the pressure between the end of the pipe cleaner (3) and the inner side of the pipe slice specimen (9) to be tested.

7. An experimental method for a pipe inner wall cleaning damage simulation experimental device according to any one of claims 1 to 6, It is characterized in that The following steps are involved: S1: establishing a simulation model according to the structural parameters of the pipe cleaner (3) and the pipeline; S2: simulating the operation process of the pipeline cleaning device (3) according to the operation parameters and working conditions of the pipeline cleaning device (3); S3: During the operation of the pig (3), according to the speed change of the pig (3) in the pipeline, sort the running speeds from large to small in sequence, and then record the positions of the top X running speeds as V-1, V-2, V-3... V-X respectively; by comparing the pipeline elevation mileage, obtain multiple pipeline elbow positions, denoted as B-1, B-2, B-3... B-Y; both X and Y are integers greater than 0; Unify the above positions as the risk points of inner wall damage during the pigging process; S4: Subsequently, using the stress simulation model and the interference amount of the pig required in the actual pigging process, take the speed at each damage risk point as the running speed of the pig (3) in sequence, and locally simulate and calculate the force condition between the pig and the inner wall of the pipeline when the pig runs in the pipeline at the risk points; S5: After the second simulation is completed, obtain the stress values between several pigs (3) and the inner side of the pipeline, and obtain the maximum stress between the pig and the inner wall of the pipeline by comparison, denoted as σ 应力最大位置 , and the operating speed corresponding to this stress is denoted as V 应力最大最大位置 ; Compare to obtain the maximum running speed of the pig, denoted as V 速度最大位置 , and the corresponding stress at this point is denoted as σ 速度最大位置 ; The velocity of the pig (3) at the maximum elbow angle in the low-lying area of the pipeline V-shaped elbow is denoted as V 低洼角度最大位置 , and the corresponding stress at this point is denoted as σ 低洼角度最大位置 ; The speed of the pig (3) at the maximum elbow angle at the high point of the pipeline A-shaped elbow is denoted as V 高处角度最大位置 , and the corresponding stress at this point is denoted as σ 高处角度最大位置 ; S6: Subsequently, set V 应力最大最大位置 , V 速度最大位置 , V 低洼角度最大位置 and V 高处角度最大位置 as the running speeds of the moving slider (2) entering the main test section in sequence, and set the respective corresponding stress values as the vertical compressive stresses of the moving slider (2) in the contact stress detection section to conduct indoor simulation tests respectively.

8. The experimental method of a pipe inner wall pigging damage simulation experimental device according to claim 7, characterized in that, The step S4 further includes the following specific steps: Based on the physical parameters, operating parameters, risk point positions and the calculated running speed of the pig, combined with the elevation-mileage schematic diagram of the pigging pipeline system, use Ansys software and based on the finite volume method, conduct simulation prediction on the inner wall damage risk points, and calculate the stress σ perpendicular to the inner wall of the pipe when the pig passes and contacts the inner wall of the pipe.

9. A terminal, characterized in that, comprises 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 can execute the experimental method of a pipe inner wall pigging damage simulation experimental device according to any one of claims 7 and 8.

10. A storage medium storing a computer program, characterized in that, the computer program realizes the experimental method of a pipe inner wall pigging damage simulation experimental device according to any one of claims 7 and 8 when executed by a processor.

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