高温气井特殊螺纹油管接头完整性分析及上扣实验研究

发布时间：2018-06-19 17:57

  本文选题：特殊螺纹接头 + 油管　； 参考：《西安石油大学》2017年硕士论文

【摘要】：在高温、高压及定向井中,油管柱受到较大的温度载荷、轴向载荷、内外压及弯曲等载荷,其中油管接头是整个油管柱最薄弱的部分。为了避免特殊螺纹接头出现应力集中而导致接头发生密封或连接失效的问题,本文研究了高温气井特殊螺纹油管接头的完整性。针对温度载荷对特殊螺纹油管接头完整性影响的研究,首先,采用弹塑性有限元法,运用ABAQUS软件建立了特殊螺纹油管接头三维有限元模型。考虑到螺旋升角对反扭矩的影响,采用控制转角的方法模拟接头的上扣过程。其次,考虑温度载荷研究了复杂载荷作用下特殊螺纹油管接头的完整性;同时研究了温度载荷对弯曲段特殊螺纹油管接头完整性的影响;并采用微牙痕液压动力钳对特殊螺纹油管接头进行了上扣实验,分析了三种扭矩下特殊螺纹油管接头的上扣性能。此外,研究了不同扭矩上扣后温度载荷对特殊螺纹油管接头完整性的影响。结果表明:复杂载荷下,随着温度变化特殊螺纹油管接头密封性能良好且未产生塑性变形,温度在50℃~150℃时对接头完整性影响较大;不同温度下弯曲段特殊螺纹油管接头Mises应力及接触压力分布不均匀,接头一边受拉一边受压,压缩端应力集中严重易产生粘扣,拉伸端密封面及台肩接触压力较小,密封性能降低;通过上扣实验验证了三维有限元法模拟特殊螺纹油管接头上扣的正确性;三种扭矩上扣后在不同温度下特殊螺纹油管接头密封面初始端及台肩鼻尖处有较高的接触压力,但密封面靠近鼻尖处及台肩出现了塑性变形,且塑性变形程度随温度升高而增大。通过研究温度载荷对特殊螺纹油管接头完整性的影响,为高温气井特殊螺纹油管接头安全使用提供参考。
[Abstract]:In high temperature, high pressure and directional wells, tubing string is subjected to large temperature load, axial load, internal and external pressure and bending load, among which the tubing joint is the weakest part of the whole tubing string. In order to avoid the stress concentration of the special threaded joint and lead to the sealing or connection failure of the joint, the integrity of the special threaded tubing joint in high temperature gas well is studied in this paper. In order to study the effect of temperature load on the integrity of special threaded tubing joints, a three-dimensional finite element model of special threaded tubing joints is established by means of elastic-plastic finite element method and Abaqus software. Considering the effect of spiral angle on reverse torque, the method of controlling rotation angle is used to simulate the buckling process of joint. Secondly, considering the temperature load, the integrity of special threaded tubing joints under complex loads is studied, and the effect of temperature load on the integrity of special threaded tubing joints in bending section is also studied. The up buckling test of special threaded tubing joint was carried out by using micro-tooth trace hydraulic power clamp, and the buckling performance of special threaded tubing joint under three kinds of torque was analyzed. In addition, the effect of temperature load after different torque buckling on the integrity of special threaded tubing joint is studied. The results show that the sealing performance of the special threaded tubing joints is good and no plastic deformation occurs with the change of temperature, and the integrity of the joints is greatly affected by the temperature of 150 鈩，

本文编号：2040772