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Fea Analysis of Residual Stress for Heat Treatment of Oil Casing

Author: JiangXu
Tutor: LiGe
School: Inner Mongolia University of Science and Technology
Course: Engineering Mechanics
Keywords: Oil casing Heat treatment Residual stress Finite Element
CLC: TG156.3
Type: Master's thesis
Year: 2010
Downloads: 127
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Abstract


Oil casing is an important guarantee for well life and safety. Oil sets the working environment is very harsh, very strict requirements for the quality and performance of the oil casing. The oil casing residual stress generated during the heat treatment, and the presence of residual stress can seriously degrade the performance of the sleeve. Therefore, the effective control of the level of residual stress is to improve the the oil casing performance of an important means. In this paper, based on the heat transfer theory, using the finite element method, the use of large-scale nonlinear finite element analysis software ABAQUS finite element model of the oil casing heat treatment process, the calculation model full account of the factors of phase change material and the casing of the heat treatment process in the thermal boundary conditions. Using this model, the first simulation the variation of the residual stress of the whole process of the oil casing heat treatment (quenching, tempering and cooling process); Second, for different process parameters on the residual stress of the heat treatment process simulation, through a comparative analysis determine the effects of residual stress of the main factors to obtain the optimum solutions. On N80 level oil casing and BT100H-grade oil casing calculated: the cooling rate during quenching quenching residual stress influence decreases when the cooling rate increases, the residual stress of quenched. The thermal conductivity of the material itself can impact on the residual stress to some extent, by the the N80 grade and BT100H level comparison shows, the greater the thermal conductivity of the material, the smaller the residual stress produced by quenching. The tempering process, the the tempering temperature setting to reduce the residual stress, Tempering Time to reduce the residual stress effect is not obvious. The tempered air cooling process can be further reduced residual stress. By comparing the optimum solution: the N80 grade oil casing quenching temperature to 870 ° C, water spray flow rate of 700 m3 h external water spray flow rate of 300 m3 h cooling rate of 56 ° C / s, the water temperature constant at 40 ° C; tempering temperature of 660 ° C and a holding time of 3 600S; insulation placed in a natural air cooling to room temperature. For BT100H grade oil casing, the proposed with N80 grade oil casing process scheme similar. The simulation using a multi-step analysis, the calculation result of the quenching process as the initial state of the tempering process, and the calculation result of the tempering process as the initial state of the cooling process, so that the quenching, tempering and cooling of the three stages connected together to form a complete step, more in line with the actual situation in the field. The heat treatment process for oil casing to provide a reference.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > Heat treatment process > Hardening, surface hardening
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