摘要
某油田油气井中发生了30CrMoA HL级抽油杆杆体断裂事故。为了确定该抽油杆杆体的断裂原因,采用宏观形貌分析、磁粉检测、力学性能、金相分析、扫描电镜(SEM)及能谱分析等方法,对该断裂抽油杆杆体进行了分析。结果表明,该断裂抽油杆杆体的化学成分、拉伸试验和夏比冲击试验结果均符合SY/T 5029—2013标准的要求,失效抽油杆材料的金相组织为回火索氏体+贝氏体+少量铁素体,其组织晶粒度为9.0级。由于该抽油杆在使用中处于含有S和Cl^(-)的腐蚀环境中,并且服役时承受了拉-压交变载荷,另外抽油杆表面存在脱碳层,使其表层的残余应力转变为拉应力,因而该抽油杆发生了腐蚀疲劳和应力腐蚀断裂。在含H_(2)S和Cl^(-)等腐蚀介质的环境中,建议采用耐腐蚀抽油杆。
A 30CrMoA HL sucker rod fracture accident occurred in an oilfield.In order to find out the fracture reason,the failed 30CrMoA HL sucker rod was analyzed by means of macroanalysis,magnetic particle testing,chemical composition analysis,mechanical properties testing,metallographic analysis,scanning electron microscopy(SEM)and energy spectrum analysis.The results show that the chemical composition,tensile test and Charpy impact test results of the fractured sucker rod body meet the requirements of SY/T 5029—2013 standard.Its microstructure is tempered sorbite+bainite+a small amount of ferrite,and the grain size is 9.0.Due to the corrosion environment containing S and Cl^(-),the alternating tensile and compressive loads during the service process of the sucker rod,and also the decarburization layer on the surface of the sucker rod which transforms the residual stress on its surface into tensile stress,corrosion fatigue and stress corrosion fracture of the sucker rod occurred.It is suggested to use anticorrosive sucker rod in the environment with corrosive media such as H_(2)S and Cl^(-).
作者
赵金兰
仝珂
瞿婷婷
李小龙
ZHAO Jinlan;TONG Ke;QU Tingting;LI Xiaolong(Key Laboratory of Petroleum Tubular Goods and Equipment Quality Safety for State Market Regulation,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China)
出处
《石油管材与仪器》
2023年第6期77-81,共5页
Petroleum Tubular Goods & Instruments
