Test sample tube and test method for in-place subsea pipe riser ultrasonic inner detector loop

Abstract

The invention discloses an in-place subsea pipe riser ultrasonic inner detector loop test sample pipe and a test method. The sample pipe comprises a plurality of defective pipes; the defective pipe is a standard pipe with a defect set, and the standard pipe is made of a steel pipeline which is consistent with the seabed riser in material and size; the number of the defective tubes is consistent with the number of the selected defective samples; the sample tube is mounted in the loop to carry out a test verification test; the pipeline testing method comprises the following steps: S1, mounting a defective pipe; s2, loop pipe cleaning operation is carried out; s3, sending / recycling the inner detector; s4, analyzing detection data and the like. The test sample tube is reasonable in structural design and is verified and applied by a loop ultrasonic detector.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline ultrasonic loop detection defect sample pipe processing, and in particular relates to an in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe and a test method. Background Art

[0002] Long-distance pipelines have become an important means of transporting energy such as oil and natural gas. In order to ensure the safe operation of long-distance pipelines, they must be inspected regularly so that problems can be discovered in time and measures can be taken to prevent major accidents. At present, conventional pipeline in-pipeline detection methods include magnetic flux leakage detection and ultrasonic detection. Among them, magnetic flux leakage detection is the most widely used and mature, but magnetic flux leakage detection is only applicable to the detection of material surfaces and near surfaces, and has poor anti-interference ability and low spatial resolution. Therefore, the measured pipe wall cannot be too thick. Compared with other detection methods, ultrasonic detection not only has high detection accuracy, but also can be applied to pipelines of different diameters and complex environments (submarine pipelines). It has become the research focus in the field of pipeline in-pipeline detection in recent years.

[0003] Chinese patent document with publication number 104634623 discloses a method for processing and manufacturing metal loss defects in pipeline girth welds, which discloses a method for processing girth weld metal loss defects. This method is based on the production of sample pipes using magnetic flux leakage detection technology and cannot meet the requirements of ultrasonic internal detectors for defective sample pipes.

[0004] Chinese patent document with publication number 102950444 discloses a method for processing and manufacturing metal defects in pipeline spiral welds. This method is also based on the production of sample pipes using leakage magnetic detection technology, and cannot meet the requirements of ultrasonic internal detectors for defective sample pipes.

[0005] At present, the technical means for making sample pipes for magnetic flux leakage detection technology are relatively mature, but the magnetic flux leakage detection test sample pipe is not suitable for the test sample pipe of the ultrasonic internal detector as a loop. There is currently no mature processing method to learn from, which limits the development of ultrasonic internal detection in loop testing, resulting in the inability to verify the probability of ultrasonic internal detectors identifying defects of different types and sizes, and it is impossible to establish a defect size determination model for steel pipes. Therefore, the processing and production of submarine pipeline ultrasonic loop detection defects is a difficult problem that needs to be solved urgently. Summary of the invention

[0006] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a test sample pipe and a test method for an ultrasonic internal detector loop of an in-situ sea pipeline riser.

[0007] The present invention is achieved through the following technical solutions:

[0008] A test sample tube for an ultrasonic internal detector loop of an in-situ sea pipe riser, the sample tube comprising a plurality of defective tubes; the defective tubes are standard tubes manufactured with defect sets, the standard tubes are made of steel pipes with the same material and size as the seabed riser; the number of the defective tubes is consistent with the number of selected defective samples; the sample tubes are installed in a loop to carry out test verification experiments.

[0009] In the above technical solution, the defect characteristics include corrosion pits, circumferential grooves, common defects, pinhole corrosion and axial grooves.

[0010] In the above technical solution, the corrosion pit is an artificial defect that simulates pitting corrosion. According to the length, width and depth of the defect, a total of 21 defects of different sizes are set.

[0011] In the above technical solution, the annular groove is an artificial defect that simulates annular cracks. It is a groove opened in the radial direction. According to the length, width and depth of the groove, a total of 7 defects of different sizes are set.

[0012] In the above technical solution, the common defect is an artificial defect that simulates uniform corrosion. According to the length, width and depth of the defect, a total of 7 defects of different sizes are set.

[0013] In the above technical solution, the pinhole corrosion is an artificial defect that simulates pinhole corrosion, and a total of 4 defects of different sizes are set according to the length, width and depth.

[0014] In the above technical solution, the axial slot is an artificial defect simulating an axial crack, which is a slot along the axial direction of the tube. According to the length, width and depth of the slot, a total of 25 defects of different sizes are set.

[0015] In the above technical solution, all defects of the defective tube are marked with defect information, and the defect information includes defect number, defect type, defect position, defect length, defect width, defect depth, axial distance of the defect from the ball end, defect design clock orientation and defect type;

[0016] In the above technical solution, the defect number is a permanent number for the defect of the defective pipe, which is marked in sequence with Arabic numerals; the defect type includes regular and irregular, regular refers to regular artificial defects, and irregular refers to irregular defects; the defect position includes inside and outside, inside refers to the inner wall defect of the pipe, and outside refers to the outer wall defect of the pipe; the outer wall defect of the pipe is a defect made on the outer wall by mechanical processing, and is processed by a CNC boring machine; the inner wall defect of the pipe is a defect made on the inner wall by mechanical processing, specifically, the standard pipe is first cut into two halves along the axial direction The pipe is then processed by a CNC boring machine. After the processing is completed, it is welded to form a complete defective pipe; the defect length refers to the value of the defect in the axial direction of the pipe, in mm; the defect width refers to the value of the defect in the radial direction of the pipe, in mm; the defect depth refers to the value of the defect in the wall thickness direction of the pipe, in mm; the axial distance of the defect from the launching end refers to the distance from the center of the defect to the launching end of the pipe, in mm; the design clock position of the defect refers to the angle between the center of the defect and the top of the pipe, the top of the pipe is 180 degrees, and the angle is counterclockwise from small to large, in degrees.

[0017] A pipeline testing method using an in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe comprises the following steps:

[0018] S1. Installation of defective pipes

[0019] Install the defective pipe in the test loop and connect it with bolts. The inlet of the defective pipe should be on the side of the launching end. The test loop is a test system built on land, which is consistent with the offshore structure and has the same size. The test loop includes a special structure of riser, expansion elbow and horizontal pipe;

[0020] S2. Loop cleaning operation

[0021] First, a foam pipe cleaner is used for cleaning. After the foam pipe cleaner completes the work, a mechanical diameter measuring pipe cleaner is used to determine the circumferential deformation. Finally, a wire brush pipe cleaner is used to clean the inner surface.

[0022] S3, sending / retrieving internal detector

[0023] After checking the internal detector and confirming that it is functioning properly, start the sending operation and place the internal detector in the ball-issuing tube to allow it to enter smoothly. The running speed of the internal detector is always maintained at 1m / s to 2m / s. When the internal detector reaches the ball-issuing end, control the pressure at the ball-receiving end to allow it to enter the ball-receiving end smoothly. When the pressure at the ball-receiving end is consistent with the external pressure, open the cover plate at the ball-receiving end and take out the internal detector.

[0024] S4. Detection data analysis

[0025] Read the detection information of the internal detector, describe the defects according to the detection defect information, compare the map of defective tubes, and analyze the detection accuracy, positioning accuracy, and defect detection rate of the internal detection.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides a loop test sample pipe and a test method for an ultrasonic internal detector of an in-situ sea pipeline riser. The test sample pipe has a reasonable structural design and has been verified and applied by a loop ultrasonic detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of a defect set in the present invention.

[0029] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0031] Example 1

[0032] A test sample tube for an ultrasonic internal detector loop of an in-situ sea pipeline riser, the sample tube comprising a plurality of defective tubes; the defective tubes are standard tubes manufactured with defect sets, the standard tubes are made of steel pipes with the same material and size as the seabed riser; the number of the defective tubes is consistent with the number of selected defective samples; the sample tubes are installed in a loop to carry out test verification experiments.

[0033] The defect set includes five types of defect characteristics, totaling 64 different defects;

[0034] All defects of this embodiment are shown in Figure 1 .

[0035] The defect characteristics include corrosion pits, circumferential grooves, common defects, pinhole corrosion and axial grooves;

[0036] The corrosion pit is an artificial defect that simulates pitting corrosion. According to the length, width and depth of the defect, a total of 21 defects of different sizes are set;

[0037] The circumferential groove is an artificial defect that simulates the circumferential crack. It is a groove in the radial direction. According to the length, width and depth of the groove, a total of 7 defects of different sizes are set;

[0038] The common defect is an artificial defect that simulates uniform corrosion. According to the length, width and depth of the defect, a total of 7 defects of different sizes are set;

[0039] The pinhole corrosion is an artificial defect that simulates pinhole corrosion. According to the length, width and depth, there are 4 different size defects.

[0040] The axial slot is an artificial defect that simulates an axial crack. It is a slot along the axial direction of the tube. According to the length, width and depth of the slot, a total of 25 defects of different sizes are set;

[0041] All defects of the defective tube are marked with defect information, and the defect information includes defect number, defect type, defect location (inside / outside), defect length (mm), defect width (mm), defect depth (mm), axial distance of the defect from the ball end (mm), defect design clock orientation (degrees), and defect type;

[0042] The defect number is a permanent number for the defect of the defective tube, and is marked in Arabic numerals in sequence, 1, 2, 3...64;

[0043] The defect type includes regular and irregular, regular refers to regular artificial manufacturing defects, irregular refers to irregular defects, and the defect type of the present application is a regular artificial manufacturing defect;

[0044] The defect location includes inner and outer, inner refers to the inner wall defect of the pipeline, and outer refers to the outer wall defect of the pipeline;

[0045] The defects on the outer wall of the pipeline are made on the outer wall by mechanical processing, and are processed by a CNC boring machine;

[0046] The inner wall defect of the pipeline is a defect made on the inner wall by mechanical processing. Specifically, the standard pipe is first cut into two half pipes along the axial direction, and then processed by a CNC boring machine. After the processing is completed, it is welded to form a complete defective pipe;

[0047] The defect length refers to the value of the defect in the axial direction of the pipeline, in mm;

[0048] The defect width refers to the value of the defect in the radial direction of the pipeline, in mm;

[0049] The defect depth refers to the value of the defect in the direction of pipe wall thickness, in mm;

[0050] The axial distance between the defect and the launch end refers to the distance between the center of the defect and the launch end of the pipeline, in mm;

[0051] The defect design clock orientation refers to the angle between the defect center and the tube top, the tube top is 180 degrees, and the angle increases counterclockwise from small to large, and the unit is degree.

[0052] The defect information of this embodiment is shown in Table 2 below:

[0053]

[0054] Example 2

[0055] A pipeline testing method for using the ultrasonic internal detector loop test sample pipe of an in-situ submarine pipeline riser described in Example 1 comprises the following steps:

[0056] S1. Installation of defective pipes

[0057] Install the defective pipe in the test loop and connect it with bolts. The inlet of the defective pipe should be on the side of the launching end. The test loop is a test system built on land, which is consistent with the offshore structure and has the same size, including special structure risers, expansion elbows, horizontal pipes, and also includes the bending radius of the risers and the bending angle of the expansion elbows;

[0058] S2. Loop cleaning operation

[0059] First, a foam pipe cleaner is used. After the foam pipe cleaner completes the operation, a mechanical diameter measuring pipe cleaner is used to determine the circumferential deformation. Finally, a wire brush pipe cleaner is used to clean the inner surface.

[0060] S3, sending / retrieving internal detector

[0061] Check the mechanical part, sealing mechanism, universal joint and power supply part of the pipe cleaner. After confirming that the functions of all parts are intact, start the sending operation, place the internal detector in the ball-issuing tube, open the sending process control valve, control the ball-issuing pressure, and make the internal detector enter the main process smoothly. During the whole detection process, the detector running speed is always maintained at 1m / s-2m / s. When the internal detector reaches the ball-issuing end, control the pressure at the ball-receiving end, open the recovery process control valve, make the internal detector enter the ball-receiving end smoothly, close the recovery process valve, open the overflow pipeline, and when the pressure at the ball-receiving end is consistent with the external pressure, open the ball-receiving end cover and take out the internal detector;

[0062] S4. Detection data analysis

[0063] Read the detection information of the internal detector, describe the defects according to the detection defect information, compare the map of defective tubes, and analyze the detection accuracy, positioning accuracy, and defect detection rate of the internal detection.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0065] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0066] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A test sample tube for ultrasonic internal detector of an in-situ sea pipeline riser loop, characterized in that: The sample pipe includes a plurality of defective pipes; the defective pipe is a standard pipe manufactured with a defect set, and the standard pipe is made of a steel pipe with the same material and size as the submarine riser; the number of the defective pipes is consistent with the number of selected defective samples; the sample pipe is installed in a loop to carry out test verification experiments.

2. The in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe according to claim 1, characterized in that: The defect characteristics include corrosion pits, circumferential grooves, common defects, pinhole corrosion and axial grooves.

3. The in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe according to claim 2, characterized in that: The corrosion pit is an artificial defect that simulates pitting corrosion. According to the length, width and depth of the defect, a total of 21 defects of different sizes are set.

4. The in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe according to claim 2, characterized in that: The circumferential groove is an artificial defect that simulates a circumferential crack. It is a groove opened in the radial direction. According to the length, width and depth of the groove, a total of 7 defects of different sizes are set.

5. The in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe according to claim 2, characterized in that: The common defect is an artificial defect that simulates uniform corrosion. According to the length, width and depth of the defect, 7 defects of different sizes are set.

6. The in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe according to claim 2, characterized in that: The pinhole corrosion is an artificial defect that simulates pinhole corrosion. According to the length, width and depth, 4 defects of different sizes are set.

7. The in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe according to claim 2, characterized in that: The axial slot is an artificial defect that simulates an axial crack. The slot is made along the axial direction of the tube. A total of 25 defects of different sizes are set according to the length, width and depth of the slot.

8. The in-situ sea pipeline riser ultrasonic internal detector loop test sample pipe according to claim 1, characterized in that: All defects of the defective tube are marked with defect information, and the defect information includes defect number, defect type, defect position, defect length, defect width, defect depth, axial distance of the defect from the launching end, defect design clock orientation and defect type;.

9. The in-situ submarine pipeline riser ultrasonic internal detector loop test sample pipe according to claim 8, characterized in that: The defect number is a permanent number for the defect of the defective tube, and is marked in Arabic numerals in sequence; The defect types include regular and irregular, regular refers to regular artificial defects, and irregular refers to irregular defects; The defect location includes inner and outer, inner refers to the inner wall defect of the pipeline, and outer refers to the outer wall defect of the pipeline; The defects on the outer wall of the pipeline are made on the outer wall by mechanical processing, and are processed by a CNC boring machine; The inner wall defect of the pipeline is a defect made on the inner wall by mechanical processing. Specifically, the standard pipe is first cut into two half pipes along the axial direction, and then processed by a CNC boring machine. After the processing is completed, it is welded to form a complete defective pipe; The defect length refers to the value of the defect in the axial direction of the pipeline, in mm; The defect width refers to the value of the defect in the radial direction of the pipeline, in mm; The defect depth refers to the value of the defect in the direction of pipe wall thickness, in mm; The axial distance between the defect and the launch end refers to the distance between the center of the defect and the launch end of the pipeline, in mm; The defect design clock orientation refers to the angle between the defect center and the tube top, the tube top is 180 degrees, and the angle increases counterclockwise from small to large, and the unit is degree.

10. A pipeline testing method using the in-situ submarine pipeline riser ultrasonic internal detector loop test sample pipe according to any one of claims 1 to 9, comprising the following steps: S1. Installation of defective pipes Install the defective pipe in the test loop and connect it with bolts. The inlet of the defective pipe should be on the side of the launching end. The test loop is a test system built on land, which is consistent with the offshore structure and has the same size. The test loop includes a special structure of riser, expansion elbow and horizontal pipe; S2. Loop cleaning operation First, a foam pipe cleaner is used for cleaning. After the foam pipe cleaner completes the work, a mechanical diameter measuring pipe cleaner is used to determine the circumferential deformation. Finally, a wire brush pipe cleaner is used to clean the inner surface. S3, sending / retrieving internal detector Check the internal detector and confirm that it is functioning properly before starting the sending operation. Place the internal detector in the ball launching tube to ensure that it enters smoothly. The running speed of the internal detector is always maintained at 1m / s to 2m / s. When the inner detector reaches the ball-issuing end, the pressure at the ball-receiving end is controlled to allow the inner detector to enter the ball-receiving end smoothly. When the pressure at the ball-receiving end is consistent with the external pressure, the cover plate at the ball-receiving end is opened to take out the inner detector. S4. Detection data analysis Read the detection information of the internal detector, describe the defects according to the detection defect information, compare the map of defective tubes, and analyze the detection accuracy, positioning accuracy, and defect detection rate of the internal detection.

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