Parallel pipeline interference elimination method in buried pipeline AC/DC stray current detection

A stray current and interference elimination technology, applied in the detection field, can solve problems such as the buried pipeline is not fixed, cannot be separated, and the distance between the magnetometer probe and the pipeline is unknown.

Active Publication Date: 2020-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to detect stray currents in pipelines needs to consider the following issues: (1) The buried depth of buried pipelines is not fixed, so the distance between the magnetometer probe and the pipeline is unknown, and the detection signal needs to be used to determine the buried depth of the pipeline at the detected position
(4) At present, the types of interference sources in pipelines are increasing, and there are DC interference, power frequency AC interference, and low-frequency alternating current interference, etc., and the existing methods of using magnetometer probes for pipeline current detection generally only involve DC interference and cannot After the AC-DC mixed interference is tested synchronously, the two types of interference are separated to evaluate the impact of different types of interference sources on the pipeline. Therefore, the mixed AC-DC interference of buried pipelines should be detected and separated
[0004] The invention patent with the application number of 201110097516.9 "Measurement method of buried pipeline depth, stray current magnitude and geomagnetic azimuth angle", this invention ignores the influence of other electromagnetic field vertical ground components during measurement. In practice, the geomagnetic field exists perpendicular to the ground At the same time, there will be a component perpendicular to the ground in the external magnetic field interference, which makes the existing method have a large error in detecting the electromagnetic field generated by the stray current of the buried pipeline
And the invention does not involve the elimination method of stray current interference in parallel pipelines

Method used

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  • Parallel pipeline interference elimination method in buried pipeline AC/DC stray current detection
  • Parallel pipeline interference elimination method in buried pipeline AC/DC stray current detection
  • Parallel pipeline interference elimination method in buried pipeline AC/DC stray current detection

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Embodiment 1

[0081] The invention provides a method for eliminating interference of parallel pipelines in the detection of AC and DC stray currents of buried pipelines.

[0082] S1. Select the position where there are parallel buried pipelines to be detected;

[0083] S2. Each pipeline corresponds to three magnetometer probes, and the three magnetometer probes are arranged in a horizontal array at equal intervals on the surface where the corresponding buried pipeline is located;

[0084] Two parallel pipes, pipe one corresponds to probe one, probe two, probe three; pipe two corresponds to probe four, probe five, probe six;

[0085] S3. When there are AC and DC stray currents in the pipeline, the six probes respectively detect the magnetic fields at their respective positions;

[0086] S4, according to the result of S3 detection, obtain the vertical component size of external stable magnetic field interference, eliminate the vertical component influence of external stable magnetic field in...

Embodiment 2

[0093] see figure 1 , when placing the probe array, make the pipeline 1 be located directly below the middle of the horizontal connection line between probe 2 and probe 3, and the projection of the horizontal connection line between probe 2 and probe 3 on the horizontal plane and the projection of the central axis of pipeline 1 on the horizontal plane are perpendicular to each other; Probe 1 is located on the extension line of the horizontal connection between probe 2 and probe 3, and probe 1 is located on the side away from pipe 2;

[0094] The pipeline 2 is located directly below the middle of the horizontal connection line between the probe 4 and the probe 5, and the projection of the horizontal connection line between the probe 4 and the probe 5 on the horizontal plane and the projection of the central axis of the pipeline 2 on the horizontal plane are perpendicular to each other; the probe 6 is located between the probe 4 and the probe 5. The probe 5 is on the extension l...

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Abstract

The invention discloses a parallel pipeline interference elimination method in a buried pipeline AC / DC stray current detection. The parallel pipeline interference elimination method relates to the technical field of detection, and is characterized in that two sets of three-magnetic saturation magnetometer probe arrays are adopted for eliminating parallel pipeline magnetic field interference and external stable magnetic field interference during detection of AC and DC mixed stray currents in the pipeline, thus the method for precisely detecting stray currents in a lower pipe of parallel pipelines. The parallel pipeline interference elimination method has the beneficial effects that the two sets of three-magnetic saturation magnetometer probe arrays are employed for detecting a magnetic field generated by the parallel pipeline currents, calculation and elimination of interference of the external stable magnetic field and the parallel pipeline current magnetic field are achieved, and on the basis, pipeline burial depth detection and current detection in the parallel pipelines can be achieved; furthermore, detection of AC and DC mixed stray currents in the pipelines is realized, and the AC and DC stray currents are separated, so as to evaluate interference conditions of the pipelines from an alternating-current interference source and a direct-current interference source respectively.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method for eliminating interference of parallel pipelines in the detection of AC and DC stray currents of buried pipelines. Background technique [0002] At present, buried pipelines are increasingly disturbed by AC and DC stray currents. The electrochemical corrosion of oil pipelines has caused huge economic losses and potential safety hazards. The effective detection of AC and DC stray currents in buried steel pipelines is related to pipelines. Important measures for safe operation. When the electromagnetic method is used to measure the stray current of the buried pipeline non-contact, the method of eliminating the external electromagnetic field is particularly important for the accurate detection of the stray current. [0003] For current detection in buried pipelines, there are some detection methods. The most direct detection method is to take a length of pipeline to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCG01V3/08
Inventor 王观军王强刘海波韩庆陈健飞王安泉陈丽娜
Owner CHINA PETROLEUM & CHEM CORP
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