长输石油管道盗孔修复强度分析

Strength Analysis of Long Distance Oil Piping after Repair for Drilled Hole

在众多管道失效形式中,长输石油管道盗孔现象尤为普遍。这些被打孔盗油的管道需要修复或者更换。尽管目前管道修复提倡采用非焊接的方法,但这类非焊接的修复方法只适用于管壁未穿透的缺陷。在管壁被穿透的情况下,只能采用焊接的方法修复。现场焊接修复打孔管道的方式有两种:接管和补板。运用ANSYS软件对两种修复方法进行有限元分析,结果表明,接管或补板的存在使管道修复结构应力分布不均匀,出现了一定的应力集中;两种修复结构整体的极限载荷相近。文章给出了两种修复结构中,不同结构尺寸对于修复结果的影响,并且提出了修复建议,对于实际打孔管道修复有一定的参考价值。

In many types of pipeline failure, man-drilled hole in long-distance oil pipelines for oil-stealing is quite popular. The drilled pipes must be repaired or replaced. Currently, non-welding methods are recommended for repairing damaged pipelines, but they are only applied to non-penetration defects in the wall thickness. In the case of the penetration defects, welding is the only way to be applied. Two methods can be used to repair drilled pipes in practice, nozzles and filled plates. In this paper, two methods are simulated by using finite element analysis method with software ANSYS. The results showed that stress distribution of repaired pipelines is non-uniform due to existence of nozzles or filled plates, and local stress concentration is also observed. Limit loads of the two repair pipelines were similar. The effects of different dimensions of nozzles and filled plates on the repaired pipelines are presented. Finally, proposals are presented which could be useful for repairing man-drilled pipeline.