P110油管应力腐蚀开裂失效的原因  

Reasons for Stress Corrosion Cracking Failure of P110 Tubing

作　　者：刘雄伟[1] 李芳[1,2] 龙武[1,2] 刘晓童[3] 杨志文 闫智伦 宫如波 陈迎锋 LIU Xiongwei;LI Fang;LONG Wu;LIU Xiaotong;YANG Zhiwen;YAN Zhilun;GONG Rubo;CHEN Yingfeng(Northwest Branch Company of Sinopec,Urumqi 830011,China;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs,Sinopec,Urumqi 830011,China;Safetech Research Institute(Beijing)Co.,Ltd.,Beijing 102200,China;School of Petroleum Engineering College University,Wuhan 430100,China)

机构地区：[1]中国石油化工股份有限公司西北油田分公司,乌鲁木齐830011 [2]中国石油化工集团公司碳酸盐岩缝洞型油藏提高采收率重点实验室,乌鲁木齐830011 [3]安科工程技术研究院(北京)有限供公司,北京102200 [4]长江大学石油工程学院,武汉430100

出　　处：《腐蚀与防护》2024年第7期108-113,共6页Corrosion & Protection

摘　　要：顺北油气田某110级油管发生开裂,通过分析开裂油管的服役环境、裂纹形貌、化学成分和力学性能等,并与同工况下未开裂油管进行对比,分析了此油管的开裂原因。结果表明:裂纹由外表面向内表面扩展,呈现树枝状分叉和不连续特征,是典型的硫化氢应力腐蚀开裂形貌;开裂油管对于抗硫化氢应力腐蚀开裂比较敏感,与未开裂油管相比,开裂油管组织为回火屈氏体,晶界比例高,位错密度大,材料硬度和强度较高易引起应力腐蚀开裂。油管在调质处理时,应尽量提高回火温度,降低材料的硬度和强度,以提高材料抗应力腐蚀开裂的能力。A 110-level oil pipe in Shunbei Oil and Gas Field cracked.By analyzing the service environment,crack morphology,chemical composition,and mechanical properties of the cracked oil pipe and comparing it with the uncracked oil pipe under the same working conditions,the cause of the cracking of this oil pipe was analyzed.The results show that the cracks propagated from the outer surface to the inner surface,exhibited dendritic branching and discontinuous characteristics,and were a typical morphology of hydrogen sulfide stress corrosion cracking.Cracked oil pipes were more sensitive to stress corrosion cracking caused by hydrogen sulfide.Compared with uncracked oil pipes,the tempered martensite structure of cracked oil pipes was more prone to stress corrosion cracking due to the high proportion of grain boundaries,high dislocation density,and high material hardness and strength.When quenching and tempering oil pipes,the tempering temperature should be increased as much as possible to reduce the hardness and strength of the material in order to improve the material's ability to resist stress corrosion and cracking.

关 键 词：P110油管 应力腐蚀开裂(SCC) 失效分析 

分 类 号：TE988[石油与天然气工程—石油机械设备]