油井空心抽油杆杆头断裂失效分析
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摘要
描述了空心抽油杆杆头的结构和断裂位置并对外观进行了检查,分析了其断口形貌、硬度、化学成分和显微组织,并结合该空心抽油杆的服役条件,对杆头的机加工质量进行了解剖分析。结果表明,滚压螺纹加工在非等壁厚圆柱面上时,在外界承载的作用下,相对壁厚较小处螺纹牙底成为疲劳裂纹源,形成疲劳断裂,为断裂失效的主要原因。针对该失效原因,提出了相应的改进方法。
Structure and fracture position of a hollow sucker rods head were described and the appearance was examined. The fracture,hardness,chemical composition and microstructure were analyzed. The machine processing quality of the rod was detected based on its working condition. Results show that the fatigue crack is initiated on thinner wall of a minor diameter when the pin-thread was processed on an unequal thickness wall. Based on the fatigue cracking cause,some countermeasures were proposed.
Structure and fracture position of a hollow sucker rods head were described and the appearance was examined. The fracture,hardness,chemical composition and microstructure were analyzed. The machine processing quality of the rod was detected based on its working condition. Results show that the fatigue crack is initiated on thinner wall of a minor diameter when the pin-thread was processed on an unequal thickness wall. Based on the fatigue cracking cause,some countermeasures were proposed.
引文
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[2]赵晓,邢庆河,张士诚.空心抽油杆在油井举升中的应用[J].油气田地面工程,2006,25(7):5-6.Zhao Xiao,Xing Qinghe,Zhang Shicheng.Application of the hollow sucker rod in oil well lifting[J].Oil-Gas field Surface Engineering,2006,25(7):5-6.
[3]潘健生,周敬恩,王广生,等.热处理手册[M].北京:机械工业出版社,2009:110-111.
[4]SY/T 5550—2012,空心抽油杆[S].北京:石油工业出版社,2013.
[5]李家华,张颖,帅瑞铖,等.不同受热条件下高延性冷轧带肋钢筋的力学性能和晶粒度[J].金属热处理,2013,38(10):35-37.Li Jiahua,Zhang Ying,Shuai Ruicheng,et al.Mechanical properties and grain size of high ductility cold-rolled ribbed steel bar under different heating conditions[J].Heat Treatment of Metals,2013,38(10):35-37.
[6]张琪.采油工程原理与设计[M].东营:中国石油大学出版社,2006:144-146.