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针对塔河油田原油集输管道进联合站弯管段发生开裂的问题,通过观察分析弯管段失效样的宏观形貌、化学组成、力学性能、金相组织、腐蚀产物形貌与成分,确定其开裂原因是:弯管材料的质量低,韧性和硬度不符合标准要求;输送介质中含水(大于60%)、含硫(1.64%),伴生气中含有一定量的H2S,且管道承受一定程度的低应力作用,在管输介质中腐蚀性成分和低应力的联合作用下,管道产生了硫化物应力腐蚀开裂;管输介质中高含量的Cl-,加速了管道的应力腐蚀开裂;弯管材料的硬度远高于标准要求,增加了其对应力腐蚀的敏感性。
In view of the cracking of the bent pipe section of the combined pipeline of crude oil gathering pipelines in Tahe Oilfield, the macroscopic morphology, chemical composition, mechanical properties, microstructure and morphologies and composition of the corrosion products were determined through observation and analysis The reasons for the cracking are as follows: the quality of elbow material is low, the toughness and hardness do not meet the standard requirements; the conveying medium contains more than 60% of water and sulfur (1.64%), the associated gas contains a certain amount of H2S, Degree of low-stress effect, the pipeline medium in the combination of corrosive components and low stress, the pipeline produced sulfide stress corrosion cracking; pipeline transport medium high content of Cl-, accelerated the pipeline stress corrosion cracking; elbow Material hardness is much higher than the standard requirements, increasing its sensitivity to stress corrosion.