油田集输用塑料合金复合管管体爆裂分析  

Failure Analysis of Anticorrosion Plastic Alloy Composite Pipe for Oil Gathering and Transportation

作　　者：李循迹[1] 李厚补 常泽亮[1] 戚东涛 毛学强[1] 魏斌 

机构地区：[1]中国石油塔里木油田公司,新疆库尔勒841000 [2]中国石油集团石油管工程技术研究院,西安710077

出　　处：《失效分析与预防》2014年第5期275-279,共5页Failure Analysis and Prevention

基　　金：国家自然科学基金(51304236);中石油塔里木油田分公司技术合作开发项目(201013090129)

摘　　要：集油管线用塑料合金复合管在使用过程中发生了管体爆裂失效事故。为了探讨复合管的失效原因,采用红外光谱分析、差热-热重分析、VST等分析手段,研究了复合管用内衬塑料层和外结构层玻璃钢树脂基体的结构成分、热性能等。结果表明:复合管内衬材料添加剂含量较多或分散不均,而复合管玻璃钢基体树脂的玻璃化转变温度远低于标准要求。较低的固化度和偏高的树脂含量导致玻璃钢结构层力学性能下降,在长期服役过程中的老化及介质腐蚀共同作用下,复合管最终爆裂失效。An anticorrosion plastic alloy composite pipe for oil gathering and transportation failed during service. Investigations were performed to identify the possible failure causes of the pipe. Composition and thermal analysis of inner plastic alloy and outer GRP resin were systematically studied by using FTIR, TG-DSC, VST, etc. Results reveal that additives in failed plastic alloy may have not been stirred enough before extrusion or the content of additives may exceed their normal range. The glass transition temperature of GRP resin was much lower than that stated in standard. Hence, the lower state of cure for resin as well as the higher resin content of GRP layer makes the outer GRP structural layer have a relatively lower mechanical property, giving rise to the final failure of the composite pipe after serving for a long time under the co-effect of the aging and corrosion.

关 键 词：失效分析 固化度 玻璃化转变温度 塑料合金 

分 类 号：TE83[石油与天然气工程—油气储运工程]