Current Situation of Research on Failure Analysis and FE Analysis of Drill Pipe Upset Transition Area

Under multiple influences by elements like medium corrosion,high temperature and high pressure,etc.,loading state of the oil drill pipe as being operated is so complicated that failures are caused frequently. Analysis and evaluation of failure of the drill pipe are helpful to reducing or postponing occurrence of such failure. Introduced here in the essay is the current situation of research on failure analysis and FE analysis of drill pipe upset transition area. It is emphasized that the research activities to be conducted next should focus on the characteristics,mechanism and causes of failure of the ultra-long Miu drill pipe,and using the 3-D FE technique to conduct systmatic mechanical analysis of the drill pipe upset transition area under the influence by the tension-bendingtorsion combined load.