A calculation method for the magnetic induction intensity of the self-leakage magnetic field of non-defective steel pipelines
A technology of magnetic induction intensity and calculation method, applied in the direction of the magnitude/direction of the magnetic field, can solve the problem of low reliability of pipeline defect identification
Active Publication Date: 2019-01-25
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
These detection methods can only qualitatively determine the location of the magnetic anomaly in the pipeline, resulting in low reliability in identifying pipeline defects
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[0050] The specific implementation will be described in detail below in conjunction with the accompanying drawings and calculation examples, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0051] A method for calculating the self-leakage magnetic field of a non-defective pipeline includes the following steps:
[0052] Step 1: Collection of basic pipeline data, mainly including pipeline material, pipe diameter, wall thickness, operating pressure, buried depth of pipeline, length of pipeline, and saturation magnetization of pipeline. Under the condition that the pipe specification is known, consult the table below to determine the yield strength of the pipe.
[0053] Table 1 Yield strength values of main pipeline steels
[0054]
[0055] Step 2, the measurement of the geomagnetic field, using a magnetic sensor to measure the ...
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The invention provides a method for calculating the magnetic induction intensity of a natural leakage magnetic field of a non defective steel pipeline, and belongs to the technical field of petroleum and natural gas pipeline detection. The calculating method includes five steps of: firstly collecting pipeline basic data; secondly measuring a geomagnetic field of the environment where the pipeline is; thirdly calculating the magnetization intensity of the pipeline by using a stress magnetization model and obtaining the magnetization intensity of any position on the pipeline; fourthly calculating natural leakage magnetic field three components of the pipeline by using a natural leakage magnetic field model, and obtaining the three component values of the magnetic induction intensity of the natural leakage magnetic field of the non defective steel pipeline; and fifthly calculating a total amount of the magnetic induction intensity of the natural leakage magnetic field of the pipeline based on the determination of the natural leakage magnetic field three components. The calculating method of the invention is simple and practical, accurately calculates the total amount and the three components of the magnetic induction intensity of the natural leakage magnetic field of the non defective steel pipeline, provides theoretical supports for the quantitative judgment of the pipeline magnetic abnormality, and improves the reliability of defect identification.
Description
technical field [0001] The patent of the invention relates to the technical field of non-destructive testing of oil and natural gas pipelines, in particular to a method for calculating the magnetic induction intensity of the self-leakage magnetic field of non-defective pipelines for magnetic testing of steel pipelines. Background technique [0002] At present, with the continuous advancement of oil and natural gas pipeline construction, the total mileage of my country's land pipelines has exceeded 120,000 kilometers. The detection of pipeline position, direction and defect position is of great significance to ensure the safe and efficient operation of pipelines and the development of national economy in our country. [0003] Commonly used pipeline nondestructive testing methods include radiographic testing, ultrasonic testing, magnetic particle testing, and magnetic flux leakage testing. These detection technologies are all passive detection technologies, which require forc...
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IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 李长俊陈超廖柯熹贾文龙吴瑕
Owner SOUTHWEST PETROLEUM UNIV