深水半潜式平台钻机前开口井架的稳定性分析

发布时间：2018-04-13 13:39

本文选题：浮式平台钻机 + 前开口井架　；参考：《西南石油大学》2015年硕士论文

【摘要】：与陆地钻机井架相比,浮式平台钻机井架除了承受正常的工作载荷外,还会受到浮式平台运动加速度引起惯性载荷、平台升沉运动引起的钻柱附加动载荷、平台倾斜产生的重力的横向分力以及海洋风载等,受力情况更加恶劣。目前,国内外均未制定海洋浮式平台钻机的设计标准,设计制造企业只能通过选择较之陆地钻机高一级别的构件来配套海洋浮式平台用钻机,其设计依据缺乏科学性。本文以南海某深水半潜式平台的运动响应为依据,以与浮式平台配套的K型动态海洋井架为研究对象,对其经历的各种海况和工况进行稳定性研究,为浮式平台钻井装备的设计提供理论依据。 1)考虑平台运动响应、海洋环境载荷以及钻机工作载荷,对浮式平台钻机井架在各种海况和工况下的受力情况进行系统分析,为井架的稳定性研究提供载荷条件。 2)井架为变截面格构式缀条梁柱,利用轴心受压柱的临界载荷等效,通过引入等效惯性矩,将变截面构件等效为同高度等截面构件；在此基础上,计入缀条的剪切变形,通过引入等效抗弯刚度将井架等效为同高度的分段等截面实腹式梁柱,作为对稳定性进行理论分析的模型。 3)利用能量法建立井架在复杂载荷作用下的平面内稳定性分析模型,并通过有限元数值计算验证了模型的有效性；通过对比各海况和工况下井架变形随钩载的变化趋势,确定出井架失稳的最不利工况,针对该工况说明井架在强度范围内发生整体失稳的可能性。 4)利用有限元软件对井架在各种海况和工况条件下进行强度计算,其内力分布作为井架局部稳定性和前大腿稳定性的载荷条件；建立局部杆件和井架前大腿稳定性分析的力学模型,通过屈曲分析研究其稳定性储备；通过对井架进行整体屈曲计算,确定其失稳临界载荷及对应的失稳模态；从稳定性的角度提出井架的优化途径。
[Abstract]:Compared with the ground rig Derrick, the floating platform Derrick Derrick not only bears the normal working load, but also receives the inertia load caused by the floating platform motion acceleration and the additional dynamic load of the drill string caused by the platform heave motion.The lateral force of gravity caused by the tilt of the platform and the wind load of the ocean are even worse.At present, there is no design standard for offshore floating platform drilling rig at home and abroad. The design and manufacture enterprises can only select the components which are one grade higher than the land drilling rig to complete the offshore floating platform drilling rig, and the design basis is lack of scientific.Based on the motion response of a deep-water semi-submersible platform in the South China Sea and taking the K type dynamic marine Derrick matching with the floating platform as the research object, this paper studies the stability of various sea conditions and working conditions experienced by the platform.It provides theoretical basis for the design of floating platform drilling equipment.1) considering the platform motion response, marine environment load and working load of drilling rig, the loading conditions of floating platform rig Derrick under various sea conditions and working conditions are analyzed systematically, which provides load conditions for the study of Derrick stability.2) the Derrick frame is composed of variable cross section lattice strands Liang Zhu. By introducing the equivalent moment of inertia, the variable section member is equivalent to the same height section member by using the critical load of the axial compression column, and on this basis, the shear deformation of the strip is taken into account.The equivalent flexural stiffness was introduced to make the Derrick equivalent to the segmented and equal section solid web Liang Zhu of the same height as the theoretical model for the stability analysis.3) the in-plane stability analysis model of Derrick under complex load is established by energy method, and the validity of the model is verified by finite element numerical calculation, and the variation trend of Derrick deformation with hook load is compared under different sea conditions and working conditions.The most unfavorable condition of Derrick instability is determined and the possibility of overall instability of Derrick in the range of strength is explained according to this condition.4) using finite element software to calculate the strength of the Derrick under various sea conditions and working conditions, and its internal force distribution is used as the load condition of the local stability of the Derrick and the stability of the front thigh.The mechanical model of the stability analysis of local members and Derrick front thighs is established, and the stability reserve is studied by buckling analysis, and the critical load and the corresponding instability modes of the Derrick are determined by the overall buckling calculation of the Derrick.The optimization method of Derrick is put forward from the point of view of stability.
【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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