自升式生产储卸油平台拖航性能分析与研究

发布时间：2018-05-24 17:46

本文选题：南海海域 + 自升式生产储卸油平台　；参考：《江苏科技大学》2015年硕士论文

【摘要】：自升式生产储卸油平台是当前海上油气生产的主力装备之一,在相对较浅水域特别是边际油田的开采生产中发挥着重要作用。自升式平台建造完毕后,要运输到工作海域,且井口间的迁移也需要进行拖航施工。常见的拖航方式有干拖和湿拖,其中干拖靠半潜驳或半潜运输船进行运输;湿拖靠平台自身浮力,借助于拖船的拉力进行迁移工作。总的来说,干拖的难度要小于湿拖。截止目前,在全球已发生的所有海洋工程装置事故中,自升式平台所占比例最高,在这些事故中,拖航事故更占有较大比例。所以有必要对自升式生产储卸油平台湿拖性能进行研究。本文以中国船舶及海洋工程设计研究院针对南海北部湾设计的一型自升式生产储卸油平台为研究对象,首先对无航速自升式平台在规则波浪中进行频域分析,然后对由拖船-拖缆-自升式平台组成的非线性拖航系统在真实拖航海况中进行时域分析。具体的研究工作如下:1、自升式平台波浪载荷和运动响应的频域分析研究自升式生产储卸油平台无航速下在线性规则波中的频域波浪载荷及其运动响应,了解其初步运动性能。在真实海况下对剖面垂向剪力、弯矩,六自由度响应进行短期预报;2、自升式平台拖航系统湿拖影响因素分析在频域分析的基础上,通过AQWA-Drift模块进行时域耦合分析。综合考虑湿拖中的影响因素:风载荷、流载荷、拖缆长度、拖航速度、首尾倾、浅水效应、风浪流联合作用等,探求了对拖航施工实践较实用的结论。3、单船湿拖中运动响应机理及二阶波浪力增阻分析将单船湿拖工况下的平台运动响应进行低频、波频分解,并计算全频响应能量谱,探讨分析了平台首摇、横荡长周期低频响应以及垂荡、横摇波频运动响应机理;并对湿拖中的二阶波浪力附加阻力进行了参数敏感性分析。4、多船拖航数值模拟与分析介绍了六种多船拖航方案,并分析对比了其应用范围及其拖船配置。在单船拖航系统模型的基础上,建立了多船拖航系统模型,并对双船非平行拖中不同拖缆夹角,平行拖中不同拖缆距离进行了优化;分析了两种不同三船拖航模式,并对其进行了优选。
[Abstract]:The jack-up production oil storage and unloading platform is one of the main equipment of offshore oil and gas production and plays an important role in relatively shallow waters especially in the production of marginal oil fields. After the construction of the jack-up platform, it must be transported to the working sea area, and the migration of the wellhead also needs towing construction. The common towing methods are dry and wet towing, in which dry towing is carried out by semi-submersible barge or semi-submersible transporter, and wet towing is carried out by the buoyancy of the platform itself with the help of the tugboat's pulling force. In general, dry drag is less difficult than wet drag. Up to now, among all the marine engineering plant accidents in the world, the proportion of jack-up platform is the highest, and towing accident occupies a large proportion in these accidents. Therefore, it is necessary to study the wet towing performance of self-lifting oil storage and unloading platform. In this paper, a type of jack-up production, storage and unloading platform designed by China Institute of ship and Marine Engineering for Beibu Gulf of the South China Sea is taken as the research object. Firstly, the frequency domain analysis of the no-speed jack-up platform in regular waves is carried out. Then, the nonlinear towing system composed of tugboat, towing cable and jack-up platform is analyzed in time domain. The specific research work is as follows: 1. The frequency domain analysis of wave load and motion response of the jack-up platform; the frequency domain wave load and its motion response of the jack-up oil storage and unloading platform in the linear regular wave without navigation velocity, and the preliminary motion performance of the platform are studied. In the real sea condition, the vertical shear force, bending moment and six degrees of freedom response of the profile are predicted in a short term. Based on the analysis of the influencing factors of wet towing system of the jack-up platform in frequency domain, the time domain coupling analysis is carried out through the AQWA-Drift module. Considering the influence factors of wet towing, such as wind load, current load, towing cable length, towing speed, head and tail tilting, shallow water effect, combined wind, wave and current, etc. This paper probes into the practical conclusion of the construction practice of towing. 3. The mechanism of motion response in wet towing of single ship and the second order wave force increase resistance analysis are used to decompose the motion response of platform under the condition of single ship wet towing, and calculate the energy spectrum of full frequency response. The mechanism of the long period low frequency response and the frequency response of the swaying wave and the rolling wave are discussed and analyzed. The parameter sensitivity analysis of the second order wave-force additional drag in wet towing is carried out. Six kinds of multi-ship towing schemes are introduced by numerical simulation and analysis of multi-ship towing, and their application scope and tugboat configuration are analyzed and compared. Based on the single-ship towing system model, the multi-ship towing system model is established, and the two different towing modes are analyzed. And the optimal selection is carried out.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE95

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