Verification device for detector in pipeline

Abstract

The utility model provides a pipeline internal detector verification device which comprises a detection loop, a water supply pipeline, a pressure supply pipeline, a ball serving pipeline and a ball receiving pipeline, the detection loop is provided with an internal detector inlet and an internal detector outlet, the internal detector inlet is connected with the ball serving pipeline, and the internal detector outlet is connected with the ball receiving pipeline. And an outlet of the inner detector is respectively connected with a water supply pipeline, a pressure supply pipeline and a ball serving pipeline. The detection loop is sequentially provided with a trafficability detection pipeline, a detection verification pipeline and a positioning precision verification pipeline at the pipeline position from the inner detector inlet to the inner detector outlet. The beneficial effects of the utility model are that the scheme can effectively verify the real size of the performance of the internal detector, analyzes the positioning and attitude of the internal detector based on experimental research, establishes a positioning and attitude mathematical model, provides a plurality of references for the design of the internal detector, effectively reduces the blocking risk of the internal detector, and improves the reliability of the internal detector. And the verification effect of the detection precision and the positioning precision of the inner detector is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas field development, and more specifically to a pipeline internal detector verification device. Background Art

[0002] The length of China's long-distance oil and gas pipelines has approached 1 million kilometers. To ensure the safe operation of long-distance pipelines, regular internal inspections of long-distance pipelines need to be carried out in accordance with national and enterprise management requirements for long-distance pipelines. In the prior art, internal inspections are carried out using internal detectors. Currently, in the verification methods of internal detectors, blockage tests, detection accuracy tests, and positioning accuracy tests are used. The above methods are all carried out in the form of towing tests. However, the towing test cannot simulate the real fluid state, so it is impossible to simulate some special structures of long-distance pipelines, such as the riser structure, expansion bend structure, and variable diameter structure of submarine oil and gas transportation pipelines. The above technical problems increase the high risk of special structures.

[0003] Therefore, there is an urgent need for a test platform with the same size, medium, and working conditions as the long-distance pipeline to verify the performance of the internal detector through this platform and provide a verification method. Summary of the Utility Model

[0004] The utility model overcomes the deficiencies in the prior art and provides a pipeline internal detector verification device.

[0005] The purpose of the utility model is achieved by the following technical solutions.

[0006] A pipeline internal detector verification device includes: a detection loop, a water supply pipeline, a pressure supply pipeline, a ball sending pipeline, and a ball receiving pipeline. An internal detector inlet and an internal detector outlet are provided on the detection loop. The internal detector inlet is connected to the ball sending pipeline, and the internal detector outlet is respectively connected to the water supply pipeline, the pressure supply pipeline, and the ball sending pipeline. On the pipeline position of the detection loop from the internal detector inlet to the internal detector outlet, a passability inspection pipeline, a detection verification pipeline, and a positioning accuracy verification pipeline are sequentially arranged.

[0007] The passability inspection pipeline includes a riser section, an expansion pipe section, and a U-shaped pipe section. The two ends of the riser section are respectively connected to the detection loop and the expansion pipe section. The expansion pipe section is connected to the U-shaped pipe section, and the U-shaped pipe section is connected to the detection loop.

[0008] One or more planar corrosion structures, longitudinal scratch structures, and axial scratch structures are provided on the detection verification pipeline.

[0009] Positioning marks are provided in the positioning accuracy verification pipeline. The positioning marks include circumferential positioning marks and axial positioning marks. The number of longitudinal positioning marks and axial positioning marks is one or more.

[0010] A tee joint is provided at the inlet of the internal detector, and the tee joint is respectively connected to the detection loop and the ball sending pipeline.

[0011] A water tank is provided on the water supply pipeline, and the water tank is connected to the water source end.

[0012] An air tank and an air compressor are provided on the pressure supply pipeline.

[0013] A first valve and a ball sending cylinder are provided on the ball sending pipeline, and a second valve and a ball receiving cylinder are provided on the ball receiving pipeline.

[0014] A verification method for a pipeline internal detector verification device includes the following steps;

[0015] S1. Conduct a passability test on the internal detector. Model the internal detector and the pipeline through modeling software, simulate the common movement conditions of the internal detector, determine that the simulated internal detector can pass through the expansion elbow of the size to be detected as a cylinder, and then carry out an operation test. Detect the pressure value at the ball sending end when the internal detector is running in the pipeline. When the pressure value is stable, it indicates that the internal detector is running normally;

[0016] When the pressure suddenly increases and continues to increase, it indicates that the internal detector is blocked. At the initial stage of blockage, increase the medium pressure at the ball sending end to slowly increase the pressure to 70% of the pipeline working pressure, and judge whether the blockage is removed. If the blockage is still not removed, then reduce the pressure at the ball sending end and reload it to 80% of the pipeline working pressure, and judge whether the blockage is removed. If the blockage is still not removed, then reduce the pressure at the ball sending end to reload the pressure to 90% of the working pressure, and judge whether the blockage is removed. If the blockage is still not removed, then use the reverse push method to return the internal detector along the original path, and the reverse push pressure gradually increases in a gradient of 80%, 90%, and 100%; if the internal detector cannot be taken out by reverse push, then remove the pipeline and take out the internal detector by mechanical traction from the pipe end;

[0017] S2. Conduct a detection accuracy test on the internal detector. According to the defect types and quantities detected by the internal detector in the detection verification pipeline, compare with the defect types and quantities set in the detection verification pipeline, and calculate the detection probability;

[0018] S3. Conduct a positioning accuracy test on the internal detector. Compare the detection data of the internal detector on the positioning accuracy verification pipeline with the data of the circumferential positioning marks and axial positioning marks set in the positioning accuracy verification pipeline. Calculate the absolute difference between the angle of the circumferential positioning mark data detected by the internal detector from the pipe top 0° and the actual angle to obtain the circumferential positioning accuracy; calculate the absolute difference between the distance of the axial positioning mark data detected by the internal detector from the pipe end and the actual distance to obtain the axial positioning accuracy.

[0019] The beneficial effects of the present utility model are:

[0020] This solution can effectively verify the actual size of the internal detector's performance. Based on experimental research, the positioning and attitude of the internal detector are analyzed, a mathematical model of positioning and attitude is established, which provides many references for the design of the internal detector, effectively reducing the risk of blockage of the internal detector and greatly improving the verification effect of the inspection accuracy and positioning accuracy of the internal detector. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the U-shaped pipe section of the passability inspection pipeline;

[0023] Figure 3 is a schematic structural diagram of the detection verification pipeline;

[0024] Figure 4 is a schematic structural diagram of the positioning accuracy verification pipeline;

[0025] In the figure: 1, detection loop; 2, passability inspection pipeline; 3, detection verification pipeline; 4, positioning accuracy verification pipeline; 5, water tank; 6, air tank; 7, air compressor; 8, first valve; 9, ball launcher; 10, second valve; 11, ball receiver; 12, tee joint; 13, planar corrosion structure; 14, longitudinal scratch structure; 15, axial scratch structure; 16, circumferential positioning mark; 17, axial positioning mark. Detailed Implementation Manner

[0026] Embodiment

[0027] A pipeline internal detector verification device includes: a detection loop 1, a water supply pipeline, a pressure supply pipeline, a ball launching pipeline, and a ball receiving pipeline. An internal detector inlet and an internal detector outlet are provided on the detection loop 1. The internal detector inlet is connected to the ball launching pipeline, and the internal detector outlet is respectively connected to the water supply pipeline, the pressure supply pipeline, and the ball launching pipeline. The pipeline positions of the detection loop 1 from the internal detector inlet to the internal detector outlet are successively provided with a passability inspection pipeline 2, a detection verification pipeline 3, and a positioning accuracy verification pipeline 4.

[0028] The passability inspection pipeline 2 is a U-shaped pipeline structure, and each straight pipe is connected by an expansion elbow.

[0029] The passability inspection pipeline 2 includes a riser section, an expansion pipe section, and a U-shaped pipe section. The two ends of the riser section are respectively connected to the detection loop 1 and the expansion pipe section. The expansion pipe section is connected to the U-shaped pipe section, and the U-shaped pipe section is connected to the detection loop 1.

[0030] One or more planar corrosion structures 13, longitudinal scratch structures 14, and axial scratch structures 15 are respectively provided on the detection verification pipeline 3.

[0031] The positioning accuracy verification pipeline 4 is provided with positioning marks, which include circumferential positioning marks 16 and axial positioning marks 17, and the number of longitudinal positioning marks and axial positioning marks 17 is one or more.

[0032] A tee joint 12 is provided at the inner detector inlet, and the tee joint 12 is respectively communicated with the detection loop 1 and the ball sending pipeline.

[0033] A water tank 5 is provided on the water supply pipeline, and the water tank 5 is communicated with the water source end.

[0034] An air tank 6 and an air compressor 7 are provided on the pressure supply pipeline.

[0035] A first valve 8 and a ball sending cylinder 9 are provided on the ball sending pipeline, and a second valve 10 and a ball receiving cylinder 11 are provided on the ball receiving pipeline.

[0036] The working principle of this solution is as follows. As Figure 1 shown, the inner detector is sent out through the ball sending cylinder 9, enters the detection loop 1 through the first valve 8 and the tee joint 12 for detection tests, and then is recovered by the ball receiving cylinder 11 through the second valve 10. The water supply pipeline and the pressure supply pipeline are used to provide the water flow and pressure of the detection loop 1, so that the pressure, flow rate, medium, and temperature of the detection loop 1 are consistent with the target inspection pipeline. Among them, the water supply pipeline supplies water through the water tank 5, and the water tank 5 is also connected to the water source to achieve the purpose of supplying water to the water tank 5. The air compressor 7 provides pressure for the air tank 6, and the air tank 6 supplies pressure to the detection loop 1.

[0037] Furthermore, the inner detector sequentially passes through the passability inspection pipeline 2, the detection verification pipeline 3, and the positioning accuracy verification pipeline 4 to perform passability tests, detection accuracy tests, and positioning accuracy tests respectively.

[0038] As Figure 2 shown, the passability inspection pipeline 2 tests the single elbow bending ability of the inner detector through the expansion pipe section. In the test, the minimum elbow radius matching the inner detector model is selected as the test pipe section, which can be replaced according to the actual test. The U-shaped pipe section is used to test the minimum straight pipe section length between consecutive elbows. In the test, the minimum straight pipe section between elbows matching the inner detector model is selected as the test pipe section.

[0039] As Figure 3 shown, a planar corrosion structure 13, a longitudinal scratch structure 14, and an axial scratch structure 15 are provided on the detection verification pipeline 3. The inner detector detects the above structures, and finally, by comparing the detection data with the actual data, the function of the detection accuracy test is achieved. The above defect structures can be set on the inner wall or outer wall of the pipe body as needed.

[0040] Preferably, in this embodiment, the number of planar corrosion structures 13, longitudinal scratch structures 14, and axial scratch structures 15 is 3 each. Among them, the dimensions of the planar corrosion structure 13 in length * width * depth are 50 * 50 * 5 mm, 20 * 20 * 3 mm, and 10 * 10 * 2 mm. The dimensions of the longitudinal scratch structure 14 in length * width * depth are 50 * 5 * 5, 30 * 3 * 3, and 20 * 2 * 2 mm. The dimensions of the axial scratch structure 15 in length * width * depth are 50 * 5 * 5, 30 * 3 * 3, and 20 * 2 * 2 mm.

[0041] As Figure 4 shown, the positioning accuracy verification pipeline 4 uses an internal detector to detect the circumferential positioning marks 16 and axial positioning marks 17, and compares the detection data with the actual data to achieve positioning accuracy verification.

[0042] Preferably, in this embodiment, the number of both the circumferential positioning marks 16 and axial positioning marks 17 is 3.

[0043] A verification method for a pipeline internal detector verification device includes the following steps;

[0044] S1. Conduct a passability test on the internal detector. Use modeling software to model the internal detector and the pipeline, simulate the common movement conditions of the internal detector, determine that the simulated internal detector can pass through the expansion elbow with the size to be detected as a cylinder, and then conduct an operation test. Detect the pressure value at the ball sending end when the internal detector is running in the pipeline. When the pressure value is stable, it indicates that the internal detector is running normally;

[0045] When the pressure suddenly increases and continues to increase, it indicates that the internal detector is blocked. At the initial stage of blockage, increase the medium pressure at the ball sending end to slowly increase the pressure to 70% of the pipeline working pressure, and judge whether it is unblocked. If it is still not unblocked, then reduce the pressure at the ball sending end and reload it to 80% of the pipeline working pressure, and judge whether it is unblocked. If it is still not unblocked, then reduce the pressure at the ball sending end and reload the pressure to 90% of the working pressure, and judge whether it is unblocked. If it is still not unblocked, then use the reverse push method to return the internal detector along the original path, and the reverse push pressure gradually increases in a gradient of 80%, 90%, and 100%; if the internal detector cannot be taken out by reverse push, then remove the pipeline and take out the internal detector by mechanical traction from the pipe end.

[0046] Furthermore, in this embodiment, the modeling software used is SolidWorks.

[0047] S2. Conduct a detection accuracy test on the internal detector. According to the defect types and quantities detected by the internal detector for the detection verification pipeline 3, compare the defect types and quantities set in the detection verification pipeline 3, and calculate the detection probability;

[0048] S3. Conduct a positioning accuracy test on the internal detector. Compare the detection data of the positioning accuracy verification pipeline 4 obtained by the internal detector with the data of the circumferential positioning mark 16 and the axial positioning mark 17 set in the positioning accuracy verification pipeline 4. Calculate the absolute difference between the angle obtained by comparing the data of the circumferential positioning mark 16 detected by the internal detector with 0° from the pipe top and the actual angle to obtain the circumferential positioning accuracy; calculate the absolute difference between the distance from the data of the axial positioning mark 17 detected by the internal detector to the pipe end and the actual distance to obtain the axial positioning accuracy.

[0049] The above has described the embodiments of the present invention in detail, but the above content is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. Any equal changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A pipeline internal detector verification device, characterized in that, Comprising: A detection loop, a water supply pipeline, a pressure supply pipeline, a ball sending pipeline, and a ball receiving pipeline. An internal detector inlet and an internal detector outlet are provided on the detection loop. The internal detector inlet is connected to the ball sending pipeline. The internal detector outlet is respectively connected to the water supply pipeline, the pressure supply pipeline, and the ball sending pipeline. A passability inspection pipeline, a detection verification pipeline, and a positioning accuracy verification pipeline are sequentially arranged at the pipeline position of the detection loop from the internal detector inlet to the internal detector outlet.

2. The pipeline internal detector verification device according to claim 1, characterized in that: The passability inspection pipeline includes a riser pipe section, an expansion pipe section, and a U-shaped pipe section. The two ends of the riser pipe section are respectively connected to the detection loop and the expansion pipe section. The expansion pipe section is connected to the U-shaped pipe section. The U-shaped pipe section is connected to the detection loop.

3. The pipeline internal detector verification device according to claim 1, characterized in that: One or more planar corrosion structures, longitudinal scratch structures, and axial scratch structures are provided on the detection verification pipeline.

4. A pipeline internal detector verification device according to claim 1, characterized in that: Positioning marks are provided in the positioning accuracy verification pipeline. The positioning marks include circumferential positioning marks and axial positioning marks. The number of the longitudinal positioning marks and the axial positioning marks is one or more.

5. The verification device for in-pipe detector according to claim 1, wherein: A three-way joint is provided on the internal detector inlet. The three-way joint is respectively communicated with the detection loop and the ball sending pipeline.

6. The pipeline internal detector verification device according to claim 1, wherein: A water tank is provided on the water supply pipeline. The water tank is communicated with the water source end.

7. A pipeline internal detector verification device according to claim 1, characterized in that: An air tank and an air compressor are provided on the pressure supply pipeline.

8. A pipeline internal detector verification device according to claim 1, characterized in that: A first valve and a ball sending cylinder are provided on the ball sending pipeline. A second valve and a ball receiving cylinder are provided on the ball receiving pipeline.

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