Research and Development of Pipe-end Upsetting Machine for Large-sized Oil Tubing and Casing

Briefed here in the paper are the development trend and limitation of the oil tubing and casing, and summarized are the research and development experience of the 12 MN/6 MN pre-stressed, 2-station pipe-end upsetting equipment for the large-sized oil tubing and casing, and the innovative features of the pipe-end upsetting technology. Also described are the main process parameters as affecting the quality of the steel tubular product with pipe-end upset. Furthermore based on the Deform-3D software, the FEA model of the pipe-end upsetting formation process is set up. Thanks to the said model, the effects on the load of the upsetting machine by such factors as the heating temperature for the pipe blank, the coefficient of the fraction between the die and the steel tube, and the upsetting speed of the punch are analyzed.