Simulation Technology in Failure Analysis of Drill Pipe

Drill pipe failure accidents often occur in oil exploration and development process, especially in transition zone position. With the help of ANSYS software, established the analysis model based on the structure of drill pipe, and analyzed the stress state of the transition zone position. Analysis results show that the transition zone is the weakest position of the whole drill pipe. Length of transition zone Miu and transition zone chamfer radius R has significant influence on stress concentration factor Kt, which is in good agreement with the actual situation. At the same time, optimization of the Miu and R values based on the minimum Kt value of transition zone was finished. Simulation analysis not only helps analyze failure cause, prompts drill pipe structural optimization, improves research methods and saves a lot of financial resources.