摘要
为降低无磁钻铤失效事故,通过宏观形貌观察、渗透检验、理化性能试验、金相检测等试验,分析了宏观形貌、宏观裂纹、化学成分、冲击功、硬度、显微组织;采用扫描电子显微镜对失效部位的微观裂纹、断口和元素分布进行分析。结果表明,在外界腐蚀介质S和Cl元素以及应力的综合作用下,无磁钻铤表面萌生了应力腐蚀裂纹;随着腐蚀介质向裂纹尖端扩散,裂纹不断沿晶界扩展并最终导致管体开裂。
To reduce the failure of non-magnetic drill collars,through macroscopic morphology observation,penetration inspection,physical and chemical performance test,metallographic inspection,etc.,the macro morphology,macro cracks,chemical composition,impact energy,hardness and structure were evaluated respectively.Scanning electron microscopy(SEM)was used to analyze the microcracks,fractures and distribution of elements in the failure site.The results show that under the combined action of external corrosive media S and Cl elements and stress,stress corrosion cracks have sprung up on the surface of non-magnetic drill collars.With the corrosive media spreaded to the crack tip,the cracks continued to expand along the grain boundary,leading pipe body to crack eventually.
作者
靳权
李锐峰
栾晖
薛凯
蔡克
宋恩鹏
郝凤丹
JIN Quan;LI Ruifeng;LUAN Hui;XUE Kai;CAI Ke;SONG Enpeng;HAO Fengdan(CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Material Support Center of Tuha Petroleum Exploration and Development Corporation, Hami, Xinjiang 839009, China;PetroChina Changqing Oilfield Company,Xi′an,Shaanxi 710016, China;China Promotion Association for Special Equipment Safety and Energy Saving, Beijing 100013,China)
出处
《石油管材与仪器》
2022年第2期54-59,64,共7页
Petroleum Tubular Goods & Instruments
关键词
钻铤
失效
裂纹
表面
断口
应力腐蚀
drill collar
failure
crack
surface
fracture
stress corrosion
