作者：刘辉1,2, 付春艳1,2, 周咏琳1,2, 李萍2, 刘晓嘉3
作者单位：1. 西南石油大学, 四川成都 610500;
2. 四川石油管理局安全环保质量监督检测研究院, 四川广汉 618300;
3. 四川石油管理局质量安全环保部, 四川成都 610051
关键词：钻杆; 失效分析; 疲劳断裂; 钻具组合
摘要：
对某油井连续发生12次刺穿断裂事故进行了调查,用力学试验、化学分析、金相、扫描电镜、能谱分析等手段并结合现场实际情况对刺穿钻杆进行了失效分析。结果表明,由空气钻井改用泥浆钻井时,由于只改变了钻井方式和钻头,未改变钻具组合而导致钻具与井壁之间的间隙过大,从而导致钻杆的疲劳断裂。
Failure analyses of drilling pipes
LIU Hui1,2, FU Chun-yan1,2, ZHOU Yong-lin1,2, LI Ping2, LIU Xiao-jia3
1. Southwest Petroleum University, Chengdu 610500, China;
2. Safety Environment Quality Surveillance and Inspection Research Institute of CNPC Sichuan Petroleum, Guanghan 618300, China;
3. Quality Safety and Environment Department of CNPC Sichuan Petroleum, Guanghan 618300, China
Abstract: The 12 continuous pier-cement fracture accidents were investigated, and failure analyses was conducted on pier-cement drilling pipes by means of mechanical analysis, chemical analysis, metallographic analysis, scanning electron microscopy (SEM), energy spectrum analysis according to the local situation. The result indicates that the fatigue fracture of drilling pipes is caused by the over wide clearance between the drilling tool combination and the well wall, and the over wide clearance is formed if only the drilling mode and bit are changed but the drilling tool combination not changed in the course from air drilling to mud drilling.
Keywords: Drilling pipe; Failure analysis; Fatigue fracture; Drilling tool combination
2008, 34(4): 119-121 收稿日期: 2007-12-7;收到修改稿日期: 2008-3-11
基金项目:
作者简介: 刘辉(1976-),女,工程师,主要从事理化性能检测工作。
参考文献
[1] 杨自林, 游华江, 蹇宗承.钻具失效事故的原因分析及对策[J].天然气工业, 2000, 20(3):57-59.
[2] 李伟华, 黄建欣.钻杆在定向孔中的疲劳破坏及造斜强度选择[J].煤田地质与勘探, 1995, 23(4):66-70.
[3] 周梦雄, 彭国良, 邱宇.石油钻杆裂纹分析[J]. 钢管, 2004, 33(5):11-13.
[4] 李连诗.钢管塑性变形原理[上册] [M].北京:冶金工业出版社, 1985:114-116.
[5] 吕建国, 桂暖银,胡远彪.钻杆失效理论分析方法初探[J]. 探矿工程, 2001(5):55-57.
[6] 孙智, 江利, 应鹏展.失效分析-基础与应用[M].北京:机械工业出版社, 2005.
[7] SY/T 5987-1994, 钻杆国外订货技术条件[S].1994.
[8] 上海交通大学.金属断口分析[M].北京:国防工业出版社, 1979.
