海洋修井机井架力学分析

【作者】 何霞；

【导师】 刘清友；

【作者基本信息】 西南石油学院 ， 机械制造及其自动化， 2003， 硕士

【摘要】 本文在收集分析国内外有关海洋修井机的设计、分析、计算、使用等资料的基础上，结合渤海油田秦皇岛32-6平台上所使用的国产HYX90型海洋修井机，开展了海洋修井机的力学分析与结构优化。在完成海洋修井机井架静力学分析的基础上首次将模拟的风荷载作用于井架，开展了对海洋修井机动力学分析，计算了海洋修井机井架在飓风等危险工况下修井机井架不同部位的应力、位移和速度时间响应历程。为进一步改进国产海洋修井机的工作性能，优化海洋修井机的结构，提高我国海洋修井机的研发水平提供了理论依据和方法。本论文的研究工作结合勃海油田的生产实际需要，也是西南石油学院与渤海油田的横向合作项目“海洋修井机风洞实验方案研究及结构优化”的主要研究工作。本论文结合生产实际主要开展了以下几方面的研究工作： 1．通过国内外海洋修井机方面相关资料的收集，找到了国内外海洋修井机的特点和差距，结合国产海洋修井机的技术现状和勃海油田的生产实际提出具体的研究方案； 2．采用Pro／E软件建立了HYX90型海洋修井机主要部件——井架的三维模型，为进一步开展对海洋修井机的力学分析和优化设计提供基础； 3．本文结合HYX90型海洋修井机井架的结构特性，按随机振动理论计算了井架的风振系数，为井架风荷载的计算提供了理论依据，解决了目前井架的风振系数没有统一标准的问题； 4．根据海洋风载的特性，采用平稳正态随机过程模拟的基本原理模拟了作用于HYX90型海洋修井机井架的风荷载，并给出了可用于井架动力学分析的荷载时程曲线； 5．根据海洋修井机的修井工况，在建立了HYX90型海洋修井机井架有限元分析模型的基础上，结合现场作业环境确定了合理的约束条件和载荷条件，为力学分析的正确性提供理论依据； 6．运用Pro／Mechanica的有限元分析模块对HYX90型海洋修井机井 海洋修井机井架力学分析架进行了有限元分析计算，得出其在各种工况下的位移和应力，找到了井架工作的危险部位，检验了井架的静强度，为井架的优化设计提供参考数据； 7．对HYX90型海洋修井机井架进行了模态分析，计算出其前八阶固有频率及振型，找到外界激振频率与井架某阶频率接近的频率，从而避免现场不恰当的操作引起井架共振； 8．将模拟的风荷载作用于井架，分析了海洋修井机井架在飓风工况下危险部位的应力、位移和速度时间响应历程，为评价该井架的动力特性提供依据。 本文利用Pro／Mechanica软件完成了国产HYX90型海洋修井机井架的静强度校核，找到了井架工作的危险部位，并与现场测试数据进行比较，验证了模型的合理性和结果的正确性。在此基础上，首次提出将模拟的风荷载作用于海洋修井机井架，对其进行了时域内的振动响应分析，弥补了井架一直没有进行风振分析的缺陷，对该海洋修井机井架的改进和设计提供了理论的参考数据，其分析方法和结果对通用石油井架的动力学分析具有狸论指导意义。更多还原

【Abstract】 On the base of collecting the information of the design, analysis, calculation and using of the ocean workover rig, this paper checked the intensity of the homemade HYX90 ocean workover derrick serving on the Qinhuang island 32-6 flat. We first applied the simulative wind loads on the derrick, analyzed the response and calculated the time response course of stress, displacement and velocity on the vary parts of the derrick when the ocean workover rig was in the simulative hurricane. This offered the theory basis and way for bettering the work capability, optimizing the ocean workover rig’s structure and improving the research level. The work this paper discussed is the need of the oil field and the main work in the cooperate item "studying the wind tunnel test scheme of the ocean workover rig and optimizing structure". The main studying work is following:1 . Through collecting the information of the ocean workover rig, the specialty and disparity between inside and outside country were found. Combining the technology actuality of homemade ocean workover rig with the yield practice in oil field, the detailed study scheme was brought forward;2. The 3D model of the main part of the HYX90 ocean workover rig - derrick was drawn using Pro/E software. This provided the more mechanics analysis and optimization design of the ocean workover rig with model basis;3. There was no uniform criterion on the wind vibration coefficient of the derrick. The thesis calculated the wind vibration coefficient of the derrick according to the stochastic vibration theory considering the HYX90 ocean workover derrick’s structure characteristic. This work offered the calculation of the wind loads applying on the derrick with theory basis;4. According to the specialty of the wind load, we simulated the wind loads on the HYX90 ocean workover derrick applying the fundament of simulating the stable normal stochastic process. The time process curve of the wind load acting on the derrick was drawn;5. On the basis of the finite element model of the HYX90 ocean workover derrick, the logical constraint and load condition were confirmed according to the workover condition. This work offered the correctness of the mechanics analysis with theory basis;6. The static mechanics analysis of the HYX90 ocean workover derrick was carried out in the Structure module of the Pro/Mechanica. We calculated the displacement and stress of the derrick in vary condition and found its danger part during working. These data supplied the optimizing design of the derrick with reference data;7. The mode analysis of the HYX90 ocean workover derrick was done and the anterior 8 modes and natural frequencies were calculated. The arouse frequency near the derrick’s was found and avoided the sympathetic vibration because of the incorrect operation;8. We first applied the simulative wind loads on the derrick, analyzed the response and calculated the time response course of stress, displacement and velocity on the vary parts of the derrick when the ocean workover rig was in the simulative hurricane. This provided the estimating dynamical characteristic of the derrick with theory basis.This thesis checked the intensity of theHYX90 ocean workover derrick using Pro/Mechanica software. The danger part of the derrick was found during working. We compared the results with test data and validated the model’s rationality and the result’s correctness. On the basis of these works, we first applied the simulative wind loads on the ocean workover derrick, analyzed the vibration response in the time field. This redeemed the limitation that there has not been the wind-induced response analysis on the derrick all the time. The referenced data was offered to the betterment and design of the ocean workover derrick. And, the technique and results had theory directing meaning for the dynamics analysis of the derrick in the oil field.更多还原