Small diameter pipelines are widely distributed in oil and gas fields,but the traditional corrosion detection methods are difficult and expensive,and the corrosion degree can only be quantitatively evaluated after the sampling points are excavated.In order to make up for this deficiency,quantitative evaluation under trenchless condition is realized:the magnetic signal characteristics of leakage magnetic field near corrosion defects are obtained by analyzing the magnetic dipole model;the relationship between the depth and width of corrosion defects and the magnetic signal is obtained by finite element simulation;SY/T6151-2009"evaluation method for corrosion damage of steel pipeline",the defect width and depth parameters required for corrosion evaluation are combined with the magnetic dipole model theory to deduce the relationship between calculation and magnetic signal characteristic parameters,and a quantitative evaluation method for pipeline corrosion under trenchless condition by weak magnetic field detection is obtained,which is verified in an oil field pipeline project,and is suitable for Trenchless condition It provides a theoretical basis for the quantitative evaluation of pipeline corrosion detection.
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