油管圆螺纹参数与螺牙牙根应力应变的关系研究

发布时间：2018-06-14 18:47

本文选题：油管失效 + 油管螺纹联接　；参考：《西南石油大学》2015年硕士论文

【摘要】：油管是石油工程中最重要的管材之一,但由于油井中恶劣的工作环境,以及油管受到的复杂载荷,导致油管失效问题频频发生,从国内外调研情况可知,油管在服役过程中经常会发生粘扣、腐蚀、刺扣、滑脱、疲劳断裂等失效事故,这些事故不仅减小了油管的使用寿命,还大大地增加了修井作业费,最严重的是影响了油井的产能,使油田产生巨大的经济损失。统计表明,油管发生失效的位置主要在油管接头处,而且主要集中在油管和接箍的第一啮合齿根处,油管失效实质上是油管螺纹失效,油管螺纹联接质量的好坏将直接影响油管的寿命,而各种螺纹参数大小是影响螺纹联接质量的关键因素,因此有必要对它们进行研究。为此,本文从管柱力学和弹塑性力学入手,建立了油管螺纹联接的力学模型,并借助有限元软件,对2-7/8”J55不加厚油管圆螺纹在不同螺纹参数下的应力应变场进行了仿真模拟,分析油管螺纹参数对螺纹联接应力应变的影响规律,最终确定了螺纹参数变化对螺纹最大应力或应变影响程度的队列,为油管厂家优化螺纹参数、有效改善螺纹应力分布、提高螺纹联接质量提供了理论依据。同时根据模拟结果并结合API标准,制定出了一套油管现场判废标准,为油田对油管进行判废提供了参考。
[Abstract]:Tubing is one of the most important pipes in petroleum engineering. However, due to the bad working environment in oil wells and the complicated load on the tubing, the problems of tubing failure occur frequently. In service, tubing often occurs failure accidents such as clasp, corrosion, buckle, slippage, fatigue fracture, etc. These accidents not only reduce the service life of tubing, but also greatly increase the cost of workover operation. The most serious is to affect the production capacity of oil wells, resulting in huge economic losses in the oil field. Statistics show that the failure position of tubing is mainly at the joint of tubing, and mainly at the first meshing root of tubing and hoop. The failure of tubing is essentially the failure of tubing thread. The quality of tubing thread connection will directly affect the life of tubing, and all kinds of thread parameters are the key factors affecting the quality of thread connection, so it is necessary to study them. In this paper, starting with string mechanics and elastic-plastic mechanics, a mechanical model of tubing thread connection is established. With the help of finite element software, the stress and strain field of 2-7 / 8 "J55 unthickened tubing circular thread under different thread parameters is simulated. The influence of thread parameters on the stress and strain of thread connection is analyzed. Finally, the queue of maximum stress or strain of thread parameters is determined. The thread parameters are optimized for tubing manufacturers and the stress distribution of thread is improved effectively. The theoretical basis is provided to improve the quality of thread connection. At the same time, according to the simulation results and the API standard, a set of tubing field waste criteria are worked out, which provides a reference for the oil field to judge the tubing.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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