A sensor for distinguishing corrosion defects on the inner and outer surfaces of pipelines

Abstract

The invention provides a sensor for distinguishing whether corrosion defects belong to the inner surface of a pipeline or the outer surface of the pipeline. The input end of an amplification filter circuit is connected with a detection coil of a detection probe, the signal generating output end of an integration signal generating and processing circuit is connected with an exciting coil of the detection probe, the signal processing input end of the integration signal generating and processing circuit is connected with the output end of the amplification filter circuit, a data storage circuit is connected with the signal processing output end of the integration signal generating and processing circuit, the amplification filter circuit, the integration signal generating and processing circuit and a power supply battery pack are arranged in a shielding box, the eddy-current effect can be produced in the wall pipe of the oil and gas pipeline under the action of an alternating-current excited electromagnetic field sent out by the exciting coil, and therefore electromagnetic induction signals received by the detection coil on the portions, with the corrosion defects, of the inner surface of the pipeline can be different from signals on other portions, electromagnetic induction signals received by the detection coil on different portions of the pipeline are recorded and compared, the distinguishing of the detects on the inner surface of the pipeline and the outer surface of the pipeline can be achieved, and the sensor has the advantages of being small in size, high in detection accuracy and the like.

Description

technical field [0001] The invention relates to the technical field of electromagnetic measurement of oil and gas pipelines, in particular to a sensor for distinguishing corrosion defects on the inner and outer surfaces of pipelines. Background technique [0002] Oil and gas pipelines, as oil and natural gas transmission facilities, are affected by the external environment and the corrosion of oil and gas transported in the pipeline. Corrosion defects may appear on the inner and outer surfaces of the pipeline, which threatens the safety of oil and gas pipelines. It is necessary to conduct defect detection in time and decide to take measures based on the detection results. Appropriate pipeline maintenance measures. The commonly used oil and gas pipeline defect detection method is to use the oil and gas pipeline defect magnetic flux leakage internal detection method. The detector moves with the oil and gas transmission medium in the oil and gas pipeline to detect and store pip...

AI Technical Summary

Problems solved by technology

The magnetic flux leakage detection sensor can effectively detect the corrosion defects of the pipeline wall, but it cannot distinguish whether the defects are on the inner surface or the outer surface of the pipeline, and the maintenance strategies adopted for the inner and outer surface defects of the pipeline are different. Therefore, it is necessary to distinguish Whether the oil and gas pipeline defect is on the inner surface or the outer surface of the pipeline

[0003] Chinese patent application 201110210589.4 discloses a device for detecting defects on the inner and outer surfaces of pipelines based on far-field eddy currents. The device uses magnetoresistive devices to receive far-field eddy current signals reflecting defects on the inner and outer surfaces of pipelines in the far-field area. The data processing module is aimed at the magnetic resistance devices. For the output electrical signal, use the excitation signal provided by the excitation module as a reference signal to calculate the phase difference, and obtain the data reflecting the defects on the inner and outer surfaces of the pipeline. This patented method can effectively detect the defects on the inner and outer surfaces of the pipeline, but it cannot distinguish whether the defects are on the inner surface of the pipeline or outer surface

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