Recuperación de la forma tipo EU para incrementar la resistencia en la tubería de completación petrolera para la empresa Sertecpet S.A.

Abstract

The research proposes to evaluate the recovery of the initial geometry of the upsetting in a pipe type EU, to increase the resistance and to form threads with better characteristics in the company Sertecpet S.A. The zone of the upsetting type EU is studied by means of a thermo-mechanical numerical model in physical, thermal and mechanical conditions of a forming process of the material steel AISI 4140; the simulation was carried out on Solidworks, Ansys, LS-dyna. Determining an increase of 54% in the tensile strength, the resistance to external and internal pressure increased by 39% and 34% respectively, these results were calculated by experimental formulas used by the pipe manufacturer TENARIS and validated by the finite element method for a pipe built with 4140 steel. The laboratory tests allowed determining a visioplastic condition of the 4140 material. It is experimentally determined that the higher the temperature the lower the resistance, the maximum resistance obtained was 318.01 MPa at 850 °C. CADCAM software and CNC lathes from Sertecpet were used for the construction of the die for testing, this equipment allows us to perform hot forming tests in the strength of materials laboratory. The material used is AISI 4340 and it was observed that it is suitable for the matrices. Explicit and implicit numerical methods software is used to simulate the behavior of steel at different temperatures, this information allows us to design equipment to recover the outer diameter of the 3 ½ EU tube. It will allow us in the future to introduce variations in the different parameters of the process, such as the diameter and thickness of other pipes. It will be possible to see the effect of the substitution of the material used by one of different elastic-mechanical behavior; moreover, it will be possible to optimize the speeds for the upsetting, to calculate process stresses and to anticipate possible failures.