Detector for measuring petroleum pipeline base metal defects

Abstract

A detector for measuring petroleum pipeline base metal defects comprises three groups of probes, each group of probes comprises six arrays, each array comprises a transmitting coil T, a shielding coilB and a main receiving coil R, the six arrays share one transmitting coil, and six shielding coils with opposite winding directions are arranged at a certain distance from the transmitting coil, so that direct coupling signals can be effectively counteracted, and signals from the base metal are enhanced. the positions and the number of turns of the transmitting coil, the shielding coil and the main receiving coil are obtained according to the principle of a three-coil system of an induction logging instrument in the petroleum logging theory, an eddy current field can be directly excited in base metal by penetrating through a coating, and changes of measurement signals received by the receiving coil are analyzed, so that the number, positions and sizes of defects can be judged. The detection process is free of contact and damage, potential safety hazards in the pipeline can be found to the maximum extent, pipeline safety accidents are effectively restrained, and the detector is more suitable for measuring petroleum pipeline base metal defects.

Description

technical field [0001] The invention relates to the fields of oil well logging technology and non-destructive testing, in particular to a detector for measuring metal defects of an oil pipeline matrix. Background technique [0002] With the development of the economy and the expansion of the production scale of enterprises, the demand for oil and natural gas energy has become increasingly prominent. Since oil and gas are transported by pipelines, pipelines are often affected by construction technology, environment and materials during use, resulting in different forms of damage to pipelines such as fatigue, corrosion, brittleness, etc., which have a great impact on the safe operation of pipelines. hazards. At present, the most effective way to prevent pipeline safety accidents is to use non-destructive testing technology to find hidden dangers in pipelines to the greatest extent. [0003] Existing pipeline non-destructive testing methods include radiographic testing, ultra...

AI Technical Summary

Problems solved by technology

Radiographic inspection is mainly to realize the quality inspection of various equipment and components through the analysis of object sound, electromagnetic waves and light. Its advantage is that it can intuitively and accurately display the comprehensive parameters in the pipeline, making the quality inspection results more accurate. A certain amount of radiation will be generated during the detection process, which will have adverse effects on the health of operators, construction workers and surrounding residents, which limits the application of radiographic testing in the non-destructive testing of oil pipelines; The pipeline to be tested emits ultrasonic waves, and an acoustic wave receiving device is installed around the pipeline, and the defect information is obtained by computer processing, analysis, and transformation. Its advantages are accurate detection results and fast speed. It is suitable for non-destructive testing of actual oil pipelines; the principle of magnetic particle testing is that after the iron pipeline is magnetized, it has a strong adsorption force to the magnetic powder. Using this feature, it can detect whether there are cracks in the iron pipeline. Its advantages are simple operation and low cost , its disadvantage is that it cannot detect non-magnetic materials, and it also has certain requirements for the smoothness of the pipeline surface; penetration testing uses fluorescent dyes to evenly brush on the clean pipeline surface, and then sprays the phase developing agent evenly on the pipeline surface, and irradiates it with ultraviolet light. The parts with cracks will show a special color, so that the existence of cracks on the surface of the pipeline can be judged. Its advantage is that it can detect pipelines of different materials, and the operation is more convenient. Cracks cannot be detected

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