【摘要】：本文圍繞石油鉆桿摩擦焊及熱處理工藝開(kāi)展研究,為了保證摩擦焊接鉆桿焊縫力學(xué)性能、硬度、金相組織等指標(biāo)達(dá)到標(biāo)準(zhǔn)要求,著重從鉆桿管體及接頭的準(zhǔn)備、摩擦焊接參數(shù)設(shè)計(jì)和熱處理工藝設(shè)計(jì)等影響焊縫質(zhì)量的因素入手,通過(guò)理論分析、試驗(yàn)論證以及現(xiàn)場(chǎng)檢驗(yàn),不斷優(yōu)化工藝技術(shù)方案,得出滿足技術(shù)要求的摩擦焊接鉆桿。研究表明,焊接需要的能量與管材壁厚以及焊接面積有關(guān),較大的壁厚和焊接面積需要較大的能量,當(dāng)理論計(jì)算的轉(zhuǎn)動(dòng)慣量介于2個(gè)級(jí)別之間時(shí),優(yōu)先選擇高一級(jí)別的轉(zhuǎn)動(dòng)慣量。同時(shí),對(duì)于相對(duì)較小壁厚和焊接面積的情況,采用高一級(jí)別轉(zhuǎn)動(dòng)慣量時(shí),需要降低轉(zhuǎn)速,以獲得合理的縮短量。焊后熱處理是提高鉆桿沖擊韌性的有效方法,其中退火工藝對(duì)摩擦焊接頭的沖擊韌性影響顯著,而且,良好的退火也有利于車(chē)削外飛邊。淬火馬氏體分解不徹底,有較多的殘留是產(chǎn)生彎曲斷裂的主要原因,通過(guò)采用提高回火溫度和延長(zhǎng)回火保溫時(shí)間的方法,促使淬火馬氏體充分分解,減少了殘余馬氏體含量,可以達(dá)到降低強(qiáng)度,提高塑性的目的。摩擦焊接修復(fù)的鉆桿能夠滿足產(chǎn)品性能要求和不同區(qū)塊、不同井深、不同井型的鉆井使用要求,質(zhì)量可靠。該工藝的研究與應(yīng)用,已產(chǎn)生較大的社會(huì)效益和經(jīng)濟(jì)效益,具有較廣闊的應(yīng)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.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TE921.2;TG453.9;TG162.75
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本文編號(hào)：2500771