定向钻穿越段中的埋地钢质管道是油气田长输管道易受损的部分,在回拖过程中管道经常会出现聚乙烯层的破裂是影响埋地长输管道安全运行及使用寿命的因素之一,特别是由管道回拖过程中补口材料的翘边断裂会造成腐蚀的问题,更值得深入研究。 Buried steel pipelines in the section of directional drilling are the vulnerable parts of the long-distance pipeline in the oil and gas field. The rupture of the polyethylene layer in the pipe during the dragging process is the factor that affects the safe operation and service life of the buried long-distance pipelines One of the problems, especially the problem of corrosion caused by the upturned edge of the filler material in the course of dragging backwards by the pipeline, deserves further study.