Application of Electromagnetic Method in High-precision Detection of Ultra-deep Pipeline Crossing
With the development of oil and gas pipeline construction,the number of pipeline crossing is increasing.In order to ensure the safety of pipeline running,a lot of pipeline cross-ings need to be detected.The depth of crossing pipelines into the ground can usually reach more than ten meters or even tens of meters,but conventional buried metal pipeline meters can only accurately detect pipelines within five meters,other pipeline detection methods such as ground penetrating radar,high density direct current,artificial seismic wave,magnetic gradient are not suitable for wide application because of their high interference,low precision and high cost.By studying the classical electromagnetic method and combining its positioning technology with the shaft survey technology,this paper proposes the method of vertical profile detection for ultra-deep pipelines,and applies it in the high-precision detection construction of the pipeline crossing the Yangtze River where the ultra-deep pipeline crossing up to 60 meters is successfully detec-ted,with less than 2 meters both in the depth error and the horizontal position error of the pipe-line,satisfying customer's requirements.
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