【摘要】：石油工業(yè)是我國(guó)的支柱產(chǎn)業(yè),油管失效的問(wèn)題一直困擾著石油的正常生產(chǎn),是影響生產(chǎn)的主要因素。近幾年油管失效的事故越來(lái)越多,占檢泵井?dāng)?shù)的26%以上,不僅嚴(yán)重影響原油的正常生產(chǎn),還造成了巨大的經(jīng)濟(jì)損失。通過(guò)統(tǒng)計(jì)失效的油管,發(fā)現(xiàn)螺紋連接處是主要的失效部位。因此,研究油管螺紋的失效是十分必要的。為此,本文對(duì)油管螺紋的失效形式與機(jī)理、受載情況及預(yù)防失效的措施進(jìn)行了研究。通過(guò)對(duì)失效油管的宏觀與微觀形貌的分析,油管螺紋嚙合出的失效形式分為油管斷裂、螺紋粘扣、螺紋刺壞。對(duì)每一種失效形式的原因進(jìn)行了研究,其中,油管斷裂失效的危害最大,主要是由于油管受到交變載荷的作用,油管脫扣失效主要是因?yàn)槁菁y牙之間的磨損以及過(guò)大的接觸應(yīng)力,油管漏失主要是因?yàn)槁菁y尺寸精度低。分析了油管軸向的靜載荷與動(dòng)載荷,建立了油管的總軸向載荷數(shù)學(xué)模型,分析了螺紋牙的受力與變形,建立了變形協(xié)調(diào)方程,分析了軸向力分布情況。利用三維軟件建立了油管與接箍的三維模型,用ANSYS Workbench對(duì)螺紋的連接性能進(jìn)行了分析,分析了不同厚度和不同直徑的油管對(duì)螺紋連接性能的影響。本文提出了預(yù)防油管失效的措施,通過(guò)提高油管修復(fù)精度、改進(jìn)上扣操作、采用大壁厚的油管等可以降低失效率。通過(guò)實(shí)驗(yàn),比較其徑向變形量,從而對(duì)措施進(jìn)行驗(yàn)證。
[Abstract]:The petroleum industry is the pillar industry of our country. The problem of tubing failure has been puzzling the normal production of petroleum and is the main factor affecting the production. In recent years, there are more and more accidents of tubing failure, accounting for more than 26% of the number of pump wells, which not only seriously affect the normal production of crude oil, but also cause huge economic losses. Through statistical failure of the tubing, it is found that the thread joint is the main failure site. Therefore, it is necessary to study the failure of tubing thread. Therefore, the failure form and mechanism of tubing thread, the loading situation and the measures to prevent the failure are studied in this paper. Through the analysis of the macroscopic and microscopic morphology of the failed tubing, the failure forms of tubing thread meshing can be divided into tubing fracture, thread sticking and thread pricking. In this paper, the causes of each failure form are studied. Among them, the failure of tubing fracture is the most harmful, mainly because the tubing is subjected to alternating load. The failure of tubing is mainly due to the wear between thread teeth and the excessive contact stress, and the leakage of tubing is mainly due to the low precision of thread size. The axial static load and dynamic load of tubing are analyzed, the mathematical model of total axial load of tubing is established, the stress and deformation of thread tooth are analyzed, the coordinate equation of deformation is established, and the distribution of axial force is analyzed. The 3D model of tubing and hoop is established by using 3D software. The connection performance of thread is analyzed by ANSYS Workbench, and the influence of different thickness and diameter of tubing on the connection performance of thread is analyzed. Measures to prevent tubing failure are put forward in this paper. The failure rate can be reduced by improving the repair accuracy of tubing, improving the operation of upper buckling and adopting tubing with large wall thickness. Through the experiment, the radial deformation is compared, and the measure is verified.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE931.2

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本文編號(hào)：2253728