石油钻杆摩擦焊及热处理工艺技术研究与应用
发布时间：2019-06-16 19:16
【摘要】：本文围绕石油钻杆摩擦焊及热处理工艺开展研究,为了保证摩擦焊接钻杆焊缝力学性能、硬度、金相组织等指标达到标准要求,着重从钻杆管体及接头的准备、摩擦焊接参数设计和热处理工艺设计等影响焊缝质量的因素入手,通过理论分析、试验论证以及现场检验,不断优化工艺技术方案,得出满足技术要求的摩擦焊接钻杆。研究表明,焊接需要的能量与管材壁厚以及焊接面积有关,较大的壁厚和焊接面积需要较大的能量,当理论计算的转动惯量介于2个级别之间时,优先选择高一级别的转动惯量。同时,对于相对较小壁厚和焊接面积的情况,采用高一级别转动惯量时,需要降低转速,以获得合理的缩短量。焊后热处理是提高钻杆冲击韧性的有效方法,其中退火工艺对摩擦焊接头的冲击韧性影响显著,而且,良好的退火也有利于车削外飞边。淬火马氏体分解不彻底,有较多的残留是产生弯曲断裂的主要原因,通过采用提高回火温度和延长回火保温时间的方法,促使淬火马氏体充分分解,减少了残余马氏体含量,可以达到降低强度,提高塑性的目的。摩擦焊接修复的钻杆能够满足产品性能要求和不同区块、不同井深、不同井型的钻井使用要求,质量可靠。该工艺的研究与应用,已产生较大的社会效益和经济效益,具有较广阔的应用前景。
[Abstract]:In this paper, the friction welding and heat treatment process of oil drill pipe are studied. In order to ensure that the mechanical properties, hardness and metallographic structure of friction welding pipe weld meet the standard requirements, starting with the preparation of drill pipe body and joint, the design of friction welding parameters and heat treatment process design and other factors affecting weld quality, through theoretical analysis, experimental demonstration and field inspection, the technological scheme is constantly optimized. The friction welding drill pipe which meets the technical requirements is obtained. The results show that the energy required for welding is related to the wall thickness and welding area of the pipe, and the larger wall thickness and welding area require larger energy. When the calculated moment of inertia is between two levels, the higher level of moment of inertia is preferred. At the same time, for the case of relatively small wall thickness and welding area, when the moment of inertia is higher than one level, it is necessary to reduce the rotating speed in order to obtain a reasonable shortening. Post-weld heat treatment is an effective method to improve the impact toughness of drill pipe, in which the annealing process has a significant effect on the impact toughness of friction welded joint, and good annealing is also beneficial to turning the outer flying edge. The main reason of bending fracture is that there are more residues. By increasing the tempering temperature and prolonging the tempering holding time, the quenched martensite can be fully decomposed, the residual martensite content can be reduced, and the strength can be reduced and the plasticity can be improved by using the method of increasing tempering temperature and prolonging tempering holding time. The drill pipe repaired by friction welding can meet the requirements of product performance and drilling in different blocks, different well depths and different well types, and the quality is reliable. The research and application of this process has produced great social and economic benefits, and has a broad application prospect.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE921.2;TG453.9;TG162.75
，
本文编号：2500771
[Abstract]:In this paper, the friction welding and heat treatment process of oil drill pipe are studied. In order to ensure that the mechanical properties, hardness and metallographic structure of friction welding pipe weld meet the standard requirements, starting with the preparation of drill pipe body and joint, the design of friction welding parameters and heat treatment process design and other factors affecting weld quality, through theoretical analysis, experimental demonstration and field inspection, the technological scheme is constantly optimized. The friction welding drill pipe which meets the technical requirements is obtained. The results show that the energy required for welding is related to the wall thickness and welding area of the pipe, and the larger wall thickness and welding area require larger energy. When the calculated moment of inertia is between two levels, the higher level of moment of inertia is preferred. At the same time, for the case of relatively small wall thickness and welding area, when the moment of inertia is higher than one level, it is necessary to reduce the rotating speed in order to obtain a reasonable shortening. Post-weld heat treatment is an effective method to improve the impact toughness of drill pipe, in which the annealing process has a significant effect on the impact toughness of friction welded joint, and good annealing is also beneficial to turning the outer flying edge. The main reason of bending fracture is that there are more residues. By increasing the tempering temperature and prolonging the tempering holding time, the quenched martensite can be fully decomposed, the residual martensite content can be reduced, and the strength can be reduced and the plasticity can be improved by using the method of increasing tempering temperature and prolonging tempering holding time. The drill pipe repaired by friction welding can meet the requirements of product performance and drilling in different blocks, different well depths and different well types, and the quality is reliable. The research and application of this process has produced great social and economic benefits, and has a broad application prospect.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE921.2;TG453.9;TG162.75
，
本文编号：2500771
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