摘要
油管由于腐蚀会在局部区域形成腐蚀坑,不仅会降低油管的抗内压性能,严重时还会导致油管穿孔,甚至断裂。在内压爆破试验机上对旧油管的内压性能进行评价,并利用有限元分析软件和理论计算模型对油管的内压强度进行计算。结果表明,对于外表面多点腐蚀,深度最大的腐蚀坑决定了油管的剩余内压强度;内压强度只取决于腐蚀坑体积,与腐蚀坑形状无关;对于外表面多点腐蚀坑,采用腐蚀坑均匀排布法能较好地预测剩余内压强度。建议对旧油管的腐蚀坑尺寸进行测量,并采用腐蚀坑均匀排布法预测油管的剩余内压强度,提高油管重复利用可靠性。
Corrosion pit was formed as local corrosion.It will deteriorate the resistance to internal pressure,and even cause fracture of tubing.The property of internal pressure resistance was evaluated by hydraulic pressure testing machine,and the internal pressure strength of tubing was calculated by means of finite element analysis software and theoretical calculation model.Results show that the deepest corrosion pit outside the surface determines the internal pressure strength of tubing,internal pressure strength depends only on the corrosion pit in volume than in shape,and the residual internal pressure strength of tubing can be predicted by the method of corrosion pit uniform distribution.So the size of corrosion pit should be measured and the method of corrosion pit uniform distribution can be suggested to predict the residual internal pressure strength of tubing for improving the reuse reliability.
出处
《石油矿场机械》
2016年第2期10-15,共6页
Oil Field Equipment
关键词
油管
腐蚀
内压强度
有限元分析
tubing
corrosion
internal pressure strength
finite element analysis
