腐蚀缺陷对油气管道剩余强度影响研究

发布时间：2018-04-02 07:23

本文选题：腐蚀缺陷　切入点：油气管道　出处：《新疆大学》2017年硕士论文

【摘要】：石油和天然气是世界上重要的能源,被广泛的应用于各行各业,管道是输送石油和天然气最重要的载体,随着人们对能源日益增多的需求,油气管道已经覆盖了每个城市,由于管道周边环境和输送介质的复杂性,油气管道不可避免发生腐蚀。腐蚀缺陷严重影响油气管道的承载能力,为了避免事故发生,必须及时对腐蚀缺陷油气管道的剩余强度进行评价,探讨腐蚀缺陷几何参数对油气管道剩余强度和等效应力影响规律,并预测油气管道的剩余强度。本文详细介绍了B31G准则、API 579准则、SY/T6151-1995方法和有限元分析方法的计算过程,并把这几种方法计算值与真实腐蚀管道爆破实验结果相比较,发现有限元分析方法具有更高的精准性。通过UG建模,利用ANSYS软件对管道模型静力求解,分析单个方形腐蚀缺陷的长度、宽度、深度、长度与深度的交互作用、单个圆形腐蚀缺陷直径、深度、直径和深度的交互作用对油气管道剩余强度的影响规律,发现缺陷深度的影响最大,长度次之,宽度和直径影响不明显,两个缺陷几何参数之间相互影响。利用ANSYS软件分析单个方形腐蚀缺陷长度、宽度、深度、单个圆形腐蚀缺陷直径、深度对油气管道等效应力的影响规律,探究轴向两个腐蚀缺陷间的交互作用和环向两个缺陷交互作用,分析方形腐蚀缺陷长度、深度、圆形腐蚀缺陷直径、深度对管道极限交互作用距离的影响规律,发现每个缺陷几何参数对等效应力都有或大或小的作用,两个腐蚀缺陷之间的交互作用对等效应力有很大的影响。通过Design Expert软件拟合出方形腐蚀缺陷长度、宽度、深度与油气管道剩余强度的数学模型,分析影响剩余强度因子的显著性以及影响规律,发现缺陷深度、深度和长度的交互作用具有最明显的显著性。
[Abstract]:Oil and gas are important sources of energy in the world, widely used in various industries, pipeline is the most important carrier of oil and gas, with the increasing demand for energy, oil and gas pipelines have covered every city. Due to the complexity of the surrounding environment and transportation medium, corrosion of oil and gas pipelines is inevitable. Corrosion defects seriously affect the bearing capacity of oil and gas pipelines, in order to avoid accidents, It is necessary to evaluate the residual strength of corroded defect oil and gas pipeline in time, and discuss the influence of geometric parameters of corrosion defect on residual strength and equivalent stress of oil and gas pipeline. In this paper, the calculation process of SYP / T6151-1995 method and finite element analysis method for B31G criterion API 579 and finite element analysis method are introduced in detail, and the calculated values of these methods are compared with the experimental results of real corrosion pipeline blasting. It is found that the finite element analysis method has higher accuracy. Through UG modeling and static solution of pipeline model with ANSYS software, the interaction of length, width, depth, length and depth of a single square corrosion defect is analyzed. The interaction of diameter, depth, diameter and depth of single circular corrosion defect affects the residual strength of oil and gas pipeline. It is found that the influence of defect depth is the biggest, the length is the second, and the influence of width and diameter is not obvious. The effects of length, width, depth, diameter and depth of a single square corrosion defect on oil and gas pipeline are analyzed by using ANSYS software. This paper probes into the interaction between two corrosion defects in the axial direction and the interaction between the two defects in the circumferential direction, and analyzes the influence of the length, depth, diameter and depth of the square corrosion defect on the limit interaction distance of the pipeline. It is found that the geometric parameters of each defect have a large or small effect on the equivalent stress, and the interaction between the two corrosion defects has a great effect on the equivalent stress. The length and width of the square corrosion defect are fitted by Design Expert software. The mathematical model of depth and residual strength of oil and gas pipeline is presented. The significance and law of influencing residual strength factor are analyzed. It is found that the interaction of defect depth depth and length is the most significant.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE988.2

【相似文献】