Investigating the Characteristic of Weak Magnetic Stress Internal Detection Signals of Long-Distance Oil and Gas Pipeline Under Demagnetization Effect

Liu, Bin; He, Zhi Min; Zhang, Baoping; Lian, Zheng; Yang, Lü; Liu, Tong

doi:10.1109/tim.2021.3112782

Cited by 6 publications

(2 citation statements)

References 44 publications

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“…It considers that the probability of the occurrence of rock burst is the butterfly-shaped plastic zone shape caused by deviatoric stress field. This can also be demonstrated from the actual size of TSF; in fact, TSF is unlikely to become the dominant factor in most cases, which has been already demonstrated in [52]. In addition, this study also preliminarily discovered the fractal characteristics of acoustic emission events distribution before sample failure.…”

Section: Discussionsupporting

confidence: 66%

The Formative Factors of a Rock Burst Based on Energy Calculations and the Experimental Verification of Butterfly-Shaped Plastic Zones

Zhang,

Feng,

Ren

et al. 2023

Fractal Fract

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The research on the formation factors of rock burst is one of the main research directions of rock mechanics in recent years, which is helpful to solve the problem of rock burst accidents. So, in this study, the calculation method of energy released during rock burst is first obtained by using different medium models, and then, the formation factors of rock bursts are obtained by comparing the calculation energy with the actual accident energy. The method of energy calculation utilizes the difference between elastoplastic and pure elastic models to innovatively quantify the specific values of energy released before and after the occurrence of the rock burst. It is considered that the stress and plastic zone state before the occurrence of rock burst have an important influence on the occurrence of the accident and are one of the formation factors, while the deviatoric stress field and butterfly-shaped plastic zone create conditions for greater energy release. In addition, the trigger stress constitutes another formation factor. The plastic zone state before rock failure is verified by the experimental test; the location distribution shape of acoustic emission (AE) events during the later stage of compression failure is approximately the same as theoretical result. The results also preliminarily indicated the fractal characteristics of acoustic emission events distribution before sample failure. The study obtained the formative factors of rock burst accident, which provides a new ideas and references for the research on the formation of rock bursts.

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Section: Discussionsupporting

confidence: 66%

The Formative Factors of a Rock Burst Based on Energy Calculations and the Experimental Verification of Butterfly-Shaped Plastic Zones

Zhang,

Feng,

Ren

et al. 2023

Fractal Fract

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“…Therefore, the uniform magnetic charge model leads to a large error in the calculation of the leakage signal and the quantitative analysis of detection results. With the decrease in defect size and the increase in lift-off value, the error increases [19][20][21]. The research of Zhong [22,23] shows that the magnetic charge density on the defect also presents a non-uniform distribution law similar to the charge, and the number of magnetic charges distributed on the edge of the defect side is far greater than the center of the defect side, but this conclusion still lacks reliable theoretical support.…”

Section: Introductionmentioning

confidence: 99%

Study of MFL signal identification in pipelines based on non-uniform magnetic charge distribution patterns

Liu¹,

Lian²,

Liu³

et al. 2023

Meas. Sci. Technol.

Self Cite

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Magnetic flux leakage (MFL), a pipeline internal detection, is the mainstream technology for international oil and gas pipeline safety maintenance. To address the problem of large errors in the assessment of defects in pipeline inspection by existing theoretical analysis models, this paper introduces the charge density parameter to establish a mathematical model of non-uniform magnetic charge for pipeline leakage detection and calculates the non-uniform distribution pattern of magnetic charge on the defect side wall. The contour plot method is proposed to visually analyze the size of defects. To compare the error between uniform and non-uniform models, and verify the correctness of the theoretical model, experiments were systematically conducted on the X70 pipeline with internal MFL technology. The results show that: the magnetic charge distribution curve is symmetrically shaped at the center of the defect, with a valley at the center and two peaks at the defect edge. As the defect depth and width increase, the magnetic charge density increases sharply near the surface and edge. The peak-to-valley spacing and peak-to-valley values in the contour map of the magnetic flux leakage signal can directly reflect the location and size of defects. The signal characteristic values follow the trend of a first-order decreasing exponential function as the value of the lift-off increases. The first-order derivative of the signal characteristic value tends to decrease and then increase as the mesh size decreases, and the extreme point of the derivative curve is the best mesh size.

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Research on magnetic memory inspection signal characteristics of multi-parameter coupling pipeline welds

Liu,

Wang,

et al. 2024

NDT & E International

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Investigating the Characteristic of Weak Magnetic Stress Internal Detection Signals of Long-Distance Oil and Gas Pipeline Under Demagnetization Effect

Cited by 6 publications

References 44 publications

The Formative Factors of a Rock Burst Based on Energy Calculations and the Experimental Verification of Butterfly-Shaped Plastic Zones

The Formative Factors of a Rock Burst Based on Energy Calculations and the Experimental Verification of Butterfly-Shaped Plastic Zones

Study of MFL signal identification in pipelines based on non-uniform magnetic charge distribution patterns

Research on magnetic memory inspection signal characteristics of multi-parameter coupling pipeline welds

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