钻井平台桩腿建造关键技术工艺的设计优化

发布时间：2018-04-13 12:21

本文选题：钻井平台 + 相贯　；参考：《东北石油大学》2015年硕士论文

【摘要】：桩腿是海洋自升式钻井平台最重要的部件之一,起着支撑与稳定的作用,其建造精度高,难度大,是整个平台建造的关键,桩腿的主弦管和主要支撑管都属于超高强度调质钢,其碳含量数值较大,焊接性能较差,且焊接工艺要求焊接口均要焊透,对切割的各类管件的质量要求十分严格。通过对桩腿结构不同类型管件连接形式的分析,确定每种相贯节点端口的焊接形式,然后选择合适的相贯线切割机,要求切割管件节点的端口型式可以满足,两管或多管在同径或异径的正交、斜交、偏心斜交等情况下的相贯节点形式。本文以数学空间解析几何为依据建立管锥相贯的一般性数学模型,应用参量方程对管锥相贯焊接坡口的几何形状进行描述,给出了数控切割参数的数学描述,分析了管锥相贯焊接坡口数控切割过程。研究了数控切割过程中管锥相贯焊接坡口的小角度问题,给出了符合现场实际生产的解决方法(过度切割、二次切割),并对小角度相贯口全焊透问题进行可行性探讨。齿条板接长工艺是自升式钻井平台桩腿建造过程中最为关键的工艺,齿条板是高强度超厚板,其焊接变形精度要求非常高。本文从厚大焊件匀速移动热源温度场分布分析着手,对齿条板接长精度管理技术进行研究,为公司新产品加工工艺开发提供技术支撑。
[Abstract]:Pile leg is one of the most important components of marine jack-up drilling platform, which plays the role of supporting and stabilizing. Its construction accuracy is high and difficult, so it is the key of the whole platform construction. The main chord tube and main supporting pipe of pile leg belong to ultra-high strength quenched and tempered steel.Its carbon content is large, the weldability is poor, and the welding process requires that the welding joints should be welded through, and the quality requirements of all kinds of pipe fittings cut are very strict.By analyzing the connection forms of different types of pipe fittings in pile and leg structure, the welding forms of each intersecting joint port are determined, and then the appropriate intersecting line cutting machine is selected, which requires that the port type of cutting pipe fitting node can be satisfied.The form of intersecting nodes of two or more tubes in the case of orthogonal, oblique, eccentric skew of the same or different diameters.Based on the analytic geometry of mathematical space, a general mathematical model of pipe cone intersecting is established in this paper. The geometric shape of the groove of pipe cone intersecting welding is described by using parametric equation, and the mathematical description of NC cutting parameters is given.The numerical control cutting process of pipe-cone intersecting welding groove is analyzed.In this paper, the problem of small angle of pipe conical intersecting welding groove in NC cutting process is studied, and the solving methods (excessive cutting, secondary cutting) are given, and the feasibility of full weld penetration problem of small angle intersecting joint is discussed.The technology of rack plate joining is the most important process in the construction process of pile leg of jack-up drilling platform. The rack plate is high strength super-thick plate, and its welding deformation precision is very high.Based on the analysis of the temperature field distribution of the uniform moving heat source of thick and large welded parts, this paper studies the precision management technology of rack plate connection, which provides technical support for the development of the new product processing technology of the company.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE951

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