膨胀套管螺纹接头性能分析及优化

发布时间：2018-05-02 10:31

本文选题：膨胀螺纹接头 + 膨胀锥　；参考：《西南石油大学》2015年硕士论文

【摘要】：膨胀套管技术已被应用于石油钻采行业的完井与修井作业中。随着膨胀套管应用井深的增加,现有的膨胀螺纹接头已经不能满足更为恶劣的作业工况,故分析研究膨胀螺纹接头的力学特性,提高接头性能对膨胀套管技术的广泛应用具有重要意义。虽然国内外学者针对膨胀螺纹接头的强度与密封性能做了大量研究,但大多集中在保证膨胀过程中的接头的密封性能上,而忽略了膨胀后的螺纹连接情况,也并未考虑膨胀工具对接头性能的影响。因此,本文通过分析螺纹接头在膨胀过程中的力学特性以及几何变形情况,提出了螺纹接头性能的评价指标,把以数学规划理论为基础的数值优化方法与有限元仿真分析相结合,利用参数化建模、近似模型和网格变形等技术,建立了螺纹接头和膨胀锥结构的优化流程,以数学过程代替人为经验,控制螺纹接头和膨胀锥的优化方向,进一步提高螺纹接头的性能。具体的分析优化过程与方法如下： (1)建立了0139.7×10.54膨胀套管接头的膨胀过程有限元模型,分析了膨胀过程中接头的力学特性和变形情况,并确定了接头性能指标与评价方法； (2)建立了螺纹接头膨胀分析的参数化计算流程,利用正交试验设计方法,对各螺纹接头结构参数进行了灵敏度分析,得到接头性能与接头结构参数之问的关系,缩小了设计变量取值范围,在此基础上完成膨胀螺纹接头几何尺寸的多目标优化,获得了接头的最优尺寸组合方案； (3)通过膨胀锥结构参数灵敏度分析,确定了用于膨胀锥优化的初始模型,并以膨胀锥边界形状作为优化对象,利用网格变形技术和近似模型方法对膨胀锥进行形状优化,获得了能显著提高接头性能的膨胀锥优化方案。本文的研究为提高膨胀套管螺纹接头的性能提供了新的分析和优化方法,有效地提高了接头的膨胀性能,对膨胀螺纹接头的优化具有一定的参考意义。
[Abstract]:Expansion casing technology has been used in completion and workover of oil drilling and production industry. With the increase of the well depth of the expansion casing application, the existing expansion thread joints can no longer meet the worse working conditions, so the mechanical properties of the expansion thread joints are analyzed and studied. It is of great significance to improve the performance of joint for the extensive application of expansion casing technology. Although scholars at home and abroad have done a lot of research on the strength and sealing performance of the expansion thread joints, most of them are focused on ensuring the sealing performance of the joints in the process of expansion, while neglecting the thread connections after expansion. The effect of expansion tools on the performance of joints is also not taken into account. Therefore, based on the analysis of the mechanical properties and geometric deformation of the threaded joints during expansion, the evaluation indexes of the properties of the threaded joints are put forward in this paper. Combining the numerical optimization method based on mathematical programming theory with finite element simulation analysis, the optimization process of screw joint and expansion cone structure is established by using parameterized modeling, approximate model and mesh deformation techniques. The optimization direction of screw joint and expansion cone is controlled by mathematical process instead of artificial experience, and the performance of thread joint is further improved. The specific analysis and optimization process and methods are as follows: 1) the expansion process finite element model of 0139.7 脳 10. 54 expansion sleeve joint is established, the mechanical characteristics and deformation of the joint during expansion are analyzed, and the performance index and evaluation method of the joint are determined. The parametric calculation flow of screw joint expansion analysis is established. The sensitivity analysis of the structural parameters of each thread joint is carried out by using the orthogonal design method, and the relationship between the joint performance and the structural parameters of the joint is obtained. On the basis of reducing the range of design variables, the multi-objective optimization of the geometric dimension of the expansion thread joint is completed, and the optimal size combination scheme of the joint is obtained. Through the sensitivity analysis of the structural parameters of the expansion cone, the initial model for the expansion cone optimization is determined, and the shape of the expansion cone is optimized by using the mesh deformation technique and the approximate model method, taking the boundary shape of the expansion cone as the optimization object. The expansion cone optimization scheme which can significantly improve the joint performance is obtained. The research in this paper provides a new analysis and optimization method for improving the performance of the expansion casing thread joint, effectively improves the expansion performance of the joint, and has a certain reference significance for the optimization of the expansion thread joint.
【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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