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Optimization of magnetic anomaly detection with single-axis sensor for pig locating in low latitude areas

Petroleum 2019年第4期5卷 417-423页

作者： Wei Xu Zhiyong Guo Zhongxiang Liu Peng Zhang Yanxi Zhou School of Mechatronic Engineering Southwest Petroleum UniversityChengdu610500China

When a pig mounted with permanent magnets gets stuck in the pipeline,it can be located by detecting the magnetic anomalies on the ground using a single-axis magnetic *** order to collect the magnetic anomaly efficiently through single-axis magnetic sensor,a geometric detection model and calculation method for singleaxis magnetic anomaly detection is established in this *** distribution of magnetic inclination and declination of the measuring points is *** results indicate that the magnetic inclination of all measuring points vary within a small range of 2°,and this value is highly dependent on the magnetic sensor which is configured aboveground around the geomagnetic ***,the magnetic declination at different points of detection surface is subject to the geomagnetic components and the Y-axis component of the magnetic field of *** magnetic declinations distribute irregularly and vary in a wide ***,to achieve a high-efficiency detection with the single-axis sensor,the sensor shall be placed in such a manner that the magnetic inclination thereof coincides with the geomagnetic *** magnetic declination of the sensor can be calculated using s,the superposed Y-axis component induced by the permanent magnets,and the corresponding formula given in this *** article demonstrates the feasibility of locating a blocked pig in the pipeline based on the single-axis magnetic anomaly *** will have a practical significance in guiding the engineering detection.

关键词： Pig blockage Pig locating Single-axis magnetic anomaly magnetic anomaly detection Optimized installation of sensor

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Geometric modeling of underground ferromagnetic pipelines for magnetic dipole reconstruction-based magnetic anomaly detection

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Petroleum 2020年第2期6卷 189-197页

作者： Dandan Zhao Zhiyong Guo Jian Du Zhongxiang Liu Wei Xu Gaofei Liu School of Mechatronic Engineering Southwest Petroleum UniversityChengdu610500China China Petroleum Pipeline Insptection Technologies Co. LtdLangfang065000China

To aid the magnetic anomaly detection(MAD)of underground ferromagnetic pipelines,this paper proposes a geometric modeling method based on the magnetic dipole reconstruction method(MDRM).First,the numerical modeling of basic pipe components such as straight sections,bends and elbows,and tee joints are discussed and the relevant mathematical formulations for these components are ***,after analyzing the function of MDRM and various element division strategies,the sectional division and blocked division methods are introduced and applied to the appropriate pipeline components to determine the volume and center coordinates of each element,establishing the general models for the three typical pipeline components *** resulting volume and center coordinates of each component are the fundamental parameters for determining the MAD forwarding of underground ferromagnetic pipelines using the ***,based on the combination and transformation of the basic pipeline components considered,the visualized geometric models of typical pipeline layouts including parallel pipelines,pipelines with elbows,and a pipeline with a tee joint are *** results demonstrate the feasibility of the proposed method of geometric modeling for the MDRM,which can be further applied to the finite element modeling of these and other components when analyzing MAD ***,the models with output parameters proposed in this paper establish a foundation for the inversion of MAD.

关键词： magnetic anomaly detection magnetic dipole reconstruction Segmentation method Pipeline detection Geometric modeling

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Construction and experimental verification research of a magnetic detection system for submarine pipelines based on a two-part towed platform

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Journal of Ocean Engineering and Science 2023年第2期8卷 169-180页

作者： Mianjin Wang Shikun Pang Kefan Jin Xiaofeng Liang Hongdong Wang Hong Yi MOE Key Laboratory of Marine Intelligent Equipment and System Shanghai Jiao Tong UniversityShanghai 200240China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

With the acceleration of the investigation and development of marine resources,the detection and location of submarine pipelines have become a necessary part of modern marine *** pipelines are a typical weak magnetic anomaly target,and their magnetic anomaly detection can only be realized within a certain *** present,a towfish or an autonomous underwater vehicle(AUV)is mainly used as the platform to equip magnetometers close to the submarine pipelines for magnetic anomaly ***,the mother ship directly affects the towfish,thus causing control *** AUV cannot detect in real time,which affects the magnetic anomaly detection and creates problems regarding detection ***,a two-part towed platform has convenient control,thus reducing the interference of the towed mother ship and real-time *** the platform can maintain constant altitude sailing through the controller,the data accuracy in the actual magnetic anomaly detection can be *** the basis of a two-part towed platform,a magnetic detection system with constant altitude sailing ability for submarine pipelines was constructed in this *** addition,experimental verification was *** experimental verification research shows that the constant altitude sailing experiment of the two-part towed platform verifies that the platform has good constant altitude sailing ability in both a hydrostatic environment and the actual marine ***,the offshore magnetic anomaly detection experiment of submarine pipelines verifies the stable measurement function of the magnetic field and the function of the system to detect magnetic anomaly of submarine pipelines.

关键词： Submarine pipelines Two-part towed platform Constant altitude sailing magnetic anomaly detection Stable measurement

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