Abstract:

The drilling pipes combined with broaching bit of large-diameter well are easily to fracture as intense longitudinal vibration,transverse vibration and torsional vibration accured during drilling down.Taking a large-diameter well drilling pipe fracture accident for example,after scientific analysis and successful treatment, this paper gives out some secure and practical plans about well accident prevention and processing measures to set up a good example using as a source of reference for dealing with similar situations.

Key words: large-diameter well, pipe fracture, accident