A distributed magnetic anomaly detection and identification method for steel pipelines
An identification method and magnetic anomaly technology, applied in the direction of material magnetic variables, etc., can solve problems such as poor effect, missed detection and wrong detection, etc., and achieve the effect of improving applicability, solving missed detection, and expanding data volume
Active Publication Date: 2022-06-28
中海石油技术检测有限公司
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Problems solved by technology
At present, when the above-mentioned detection technology is applied, the magnetic anomaly of the pipeline is usually determined according to the change of the normal component of the magnetic field along the direction of the pipeline or the value of the magnetic field modulus.
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[0030] In order to further understand the content of the invention, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:
[0031] Referring to the attached drawings, a method for detecting and identifying distributed magnetic anomalies in steel pipes adopts the following steps:
[0032] Step 1: Use a magnetometer to measure the magnetic field strength along the pipeline to obtain a three-component change curve of the distributed magnetic force. The magnetometer is provided with at least three three-component magnetic probes ①, ②, ③, ④ that are arrayed laterally along the pipeline.
[0033] After exporting the raw data obtained from the measurement, a map can be obtained, and the map can be converted into tabular data by using software, for example, matlab software can be used to convert the map into tabular data.
[0034] Step 2: Combine and subtract the magnetic three-compon...
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The invention discloses a method for detecting and identifying distributed magnetic anomalies in steel pipelines. The following steps are adopted: Step 1: Use a magnetometer to measure the magnetic field strength along the direction of the pipeline to obtain a distributed magnetic three-component change curve. The magnetometer is equipped with at least three A three-component magnetic probe along the transverse array; Step 2: Combining and subtracting the magnetic three-component data measured by any two three-component magnetic probes to obtain the three-component horizontal gradient curve of the distributed magnetic field; Step 3: Comparing the three-component magnetic field The horizontal gradient curve is corrected and denoised to obtain valid data; Step 4: Calculate the combined magnetic anomaly; Step 5: Determine the abnormal position; Step 6: Determine the non-stress abnormal position; Step 7: Obtain the stress abnormal position and combine the combined The abnormal eigenvalue of the magnetic anomaly quantity gives the evaluation of the danger level. The invention can quickly determine the abnormal position of the force and magnetism of the pipeline in a complicated environment, and the detection rate of the force and magnetism abnormality is higher than 90%.
Description
technical field [0001] The invention relates to the technical field of pipeline detection, in particular to a distributed magnetic anomaly detection and identification method for steel pipelines. Background technique [0002] Long-distance pipeline transportation has the characteristics of less one-time investment, good sealing, cost saving, and high degree of automation. It is suitable for transporting flammable and explosive oil and natural gas. my country's submarine pipelines have been laid and operated for more than 30 years. With the increase in the service life of the submarine pipelines, some submarine pipelines have entered the later stage of frequent accidents. The main reasons for the failure of the submarine pipelines are: internal and external corrosion and third-party damage. In recent years, with the application of the detection technology inside the subsea pipeline, the frequent occurrence of subsea pipeline accidents due to internal and external corrosion ha...
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IPC IPC(8): G01N27/85
CPCG01N27/85
Inventor 王怀江曲杰陈刚崔矿庆蔡永桥卢进陈秋华倪剑
Owner 中海石油技术检测有限公司