海洋塔形井架静动态力学特性仿真研究

发布时间：2018-06-19 09:42

本文选题：浮式钻井平台 + 塔形井架　；参考：《西南石油大学》2015年硕士论文

【摘要】：随着深海石油天然气资源的大量开采,用于深海石油勘探开发的海洋浮式平台也将愈加受到重视。而海洋井架作为浮式平台钻机起升系统的关键部位,除了受到常规的静载作用外,还要受到风、浪和洋流等动载的作用,受力状况十分复杂。由于我国海洋井架的设计研究尚处于摸索阶段,为保障海洋井架结构设计合理、使用安全可靠,开展海洋井架的静动态力学性能研究具有十分重要的意义。本论文以目前海洋钻井平台中使用较为广泛的塔形井架为研究对象,经过结构的简化与假设,建立海洋塔形井架有限元模型。设计建造一定缩尺比的模型井架,对其开展试验测试与仿真对比研究,来验证其有限元模型的正确性,进而推广验证海洋塔形井架有限元模型的正确性,再开展海洋塔形井架静动态力学特性仿真研究。具体研究内容如下： (1)根据实际井架的结构参数,通过合理的简化与假设,采用Pro/Engineer软件建立海洋塔形井架几何模型,并导入ANSYS中,设置单元材料参数和各杆件截面尺寸,划分网格,建立海洋塔形井架有限元模型。 (2)依据海洋塔形井架的结构参数,按照1：14的缩尺比设计建造模型井架,并进行模型井架的静力测试与模态测试；根据模型井架结构参数,采用与海洋塔形井架相同的建模方法,建立模型井架有限元模型,开展与试验测试相对应的静力分析与模态分析；对比试验与仿真结果,验证模型井架有限元分析模型的正确性,进而推广验证海洋塔形井架有限元模型的正确性。 (3)开展海洋塔形井架静力分析和稳定性分析。计算该井架在恒载工况、最大钻柱重量工况、最大钩载工况以及三种风浪组合载荷工况下的载荷力,完成海洋塔形井架在各种工况下的静力仿真分析及静强度安全评价；对该井架的整体稳定性进行分析,来预测该井架的理论屈曲强度,得到其失稳临界载荷。 (4)开展海洋塔形井架动态力学特性研究,完成塔形井架的模态分析、起下钻瞬间的动力学响应分析、周期性升沉载荷下的谐响应分析以及海浪谱间接作用下的谱响应分析。通过对模型井架的试验测试与其有限元模型仿真对比,间接的验证了海洋塔形井架有限元模型的正确性。利用该有限元模型,完成了海洋塔形井架静动态力学特性仿真研究,得出该井架的应力分布、变形趋势以及动态响应参数,为海洋井架的安全评估和结构优化设计提供理论指导依据。
[Abstract]:With the exploitation of deep-sea oil and gas resources, the offshore floating platform for deep-sea oil exploration and development will be paid more and more attention. As the key part of the hoisting system of floating platform drilling rig, the offshore Derrick is not only subjected to the normal static load, but also to the dynamic loads, such as wind, wave and ocean current. Since the design and research of marine Derrick in China is still in the exploratory stage, it is of great significance to study the static and dynamic mechanical properties of the marine Derrick in order to ensure its reasonable design and safe and reliable use. In this paper, the tower Derrick which is widely used in offshore drilling platform is taken as the research object. The finite element model of the tower Derrick is established through the simplification and assumption of the structure. The model Derrick with a certain scale ratio is designed and constructed, and the experimental test and simulation are carried out to verify the correctness of the finite element model, and then the validity of the finite element model of the marine tower Derrick is generalized and verified. The simulation study on static and dynamic mechanical characteristics of marine tower Derrick is carried out. The specific research contents are as follows: (1) according to the structural parameters of actual Derrick, through reasonable simplification and hypothesis, the geometric model of ocean tower Derrick is established by using Pro-Engineer software, and imported into ANSYS. The finite element model of ocean tower Derrick is established by setting up element material parameters and cross section size of each member. According to the structural parameters of ocean tower Derrick, the model Derrick is designed and constructed according to the scale ratio of 1:14. According to the structural parameters of the model Derrick and the same modeling method as the ocean tower Derrick, the finite element model of the model Derrick is established. The static analysis and modal analysis corresponding to the test are carried out, and the validity of the finite element analysis model of the model Derrick is verified by comparing the test results with the simulation results. Then the finite element model of ocean tower Derrick is generalized to verify the correctness of the finite element model. 3) the static analysis and stability analysis of ocean tower Derrick are carried out. The load forces of the Derrick under the conditions of dead load, maximum drill string weight, maximum hook load and three combined wind and wave loads are calculated, and the static simulation analysis and static strength safety evaluation of the marine tower Derrick under various working conditions are completed. The overall stability of the Derrick is analyzed to predict the theoretical buckling strength of the Derrick and to obtain its unstable critical load. The dynamic response analysis, the harmonic response analysis under the cyclic heave load and the spectral response analysis under the indirect action of the wave spectrum are presented. The validity of the finite element model of the marine tower Derrick is indirectly verified by comparing the experimental test of the model Derrick with its finite element model simulation. Using the finite element model, the static and dynamic mechanical characteristics of the tower Derrick are simulated, and the stress distribution, deformation trend and dynamic response parameters of the Derrick are obtained. It provides theoretical basis for safety assessment and structural optimization design of marine Derrick.
【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】：TE951

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