深海Spar平台双船浮托安装数值模拟研究
发布时间：2019-05-22 11:35
【摘要】：人类对石油资源的需求口益增加,陆上资源亦日趋枯竭,因此对海上油气资源的勘探及开发迫在眉睫。目前世界各国都在大力发展海上钻井及采油平台技术,争取在即将到来的资源大战中占有有利地位。如何快速、安全、经济的将海上平台安装在指定海域是平台海上施工的一个研究重点。平台的海上安装一般有吊装法和浮托法安装两种,而传统的吊装法安装随着安装费用的提高、上部组块重量的增大以及平台结构的限制,其应用范围越来越受到限制。因此浮托法安装逐渐在海上安装中占据一席之地,并在国内外得到广泛应用。其中,双船浮托安装作为浮托法安装的一种,有着不受平台开口及吃水的限制、可以安装较大组块重量的优点,已然成为了平台海上安装的热点。本文首先介绍了浮托法安装的操作过程,阐述了国内外学者对浮托法安装的研究现状及进展,详细介绍了双船浮托法安装的步骤。其次,参考适合中国南海海域的Cell Spar概念模型,根据使用双船浮托法安装上部组块的过程中重量载荷的转移特点,使用水动力计算软件AQWA建立目标平台在安装中不同阶段的水动力模型。采用三维势流理论,对不同阶段的水动力模型进行了频域分析,得到了卸载过程中浮托驳船和Spar平台的附加质量系数、阻尼系数和运动幅值响应算子(RAO)等水动力参数以及在规则波中的运动特性。然后,在频域分析的基础上,建立双船浮托安装的时域计算模型。使用AQWA-Drift模块模拟浮托驳船、上部模块和平台主体三者以刚接、铰接两种不同连接方式在实际安装海洋环境中的运动。文章分别从驳船、平台间的相对运动对比、刚接铰接时的单个浮体运动响应对比、连接处的接触点受力情况对比和系泊缆的受力对比四个方面分析了Spar平台的上部模块以不同连接方式在双船浮托安装中的运动特性。以上部载荷从浮托驳船转移重量50%到平台主体时为例,通过对刚接、铰接以及环境载荷不同入射方向进行对比,得出通过数值模拟,在浮托安装的此阶段时使用刚性连接方式连接浮托驳船和上部模块最为合适。最后,依据刚性连接的基础,在环境载荷180°入射时,通过改变浮托驳船与平台主体之间的间距、风浪流海洋环境参数等相关参数对浮托安装模型中的平台主体进行了运动响应预报,得到了其运动的变化规律,为以后的研究提供参考依据。本文采用数值模拟的方法研究了深海Cell Spar平台在使用双船浮托法安装过程中的相关问题,探究了不同连接方式对安装的影响,丰富了双船浮托法安装内容,对以后的海上浮托安装的数值计算具有一定的参考价值。
[Abstract]:With the increase of human demand for oil resources and the depletion of onshore resources, it is urgent to explore and exploit offshore oil and gas resources. At present, all countries in the world are vigorously developing offshore drilling and oil production platform technology, and strive to occupy a favorable position in the coming resource war. How to install the offshore platform in the designated sea area quickly, safely and economically is a research focus of the offshore construction of the platform. There are generally two kinds of offshore installation of platform: hoisting method and floating method. With the increase of installation cost, the weight of upper block and the limitation of platform structure, the application scope of traditional hoisting method is more and more limited. Therefore, float installation gradually occupies a place in offshore installation, and has been widely used at home and abroad. Among them, as a kind of float installation, double ship float installation has the advantage of not being limited by platform opening and draught, and can install large block weight, which has become the hot spot of platform offshore installation. This paper first introduces the operation process of float method installation, expounds the research status and progress of domestic and foreign scholars on float method installation, and introduces in detail the steps of double ship float method installation. Secondly, referring to the Cell Spar conceptual model suitable for the South China Sea, according to the transfer characteristics of the weight load in the process of installing the upper block by using the two-ship floating bracket method, The hydrodynamic model of the target platform in different stages of installation is established by using the hydrodynamic calculation software AQWA. Based on the three-dimensional potential flow theory, the hydrodynamic models of different stages are analyzed in frequency domain, and the additional mass coefficients of buoy barge and Spar platform during unloading are obtained. Hydrodynamic parameters such as damping coefficient and motion amplitude response operator (RAO) and their motion characteristics in regular waves. Then, on the basis of frequency domain analysis, the time domain calculation model of double ship float installation is established. The AQWA-Drift module is used to simulate the movement of the buoy barge, the upper module and the platform body in the actual installation marine environment. In this paper, the relative motion between barge and platform is compared, and the motion response of a single floating body when it is just connected is compared. The movement characteristics of the upper module of Spar platform in the installation of double ship floating bracket are analyzed from four aspects: the force comparison of the contact point at the joint and the force comparison of the mooring cable. Taking the upper load transfer 50% of the weight from the buoy barge to the main body of the platform as an example, by comparing the rigid connection, the articulation and the different incident directions of the environmental load, the numerical simulation is obtained. It is most suitable to use rigid connection mode to connect float barge and upper module at this stage of float installation. Finally, according to the foundation of the rigid connection, when the environmental load is 180 掳incident, by changing the distance between the buoy barge and the main body of the platform, The motion response of the platform body in the float installation model is predicted by the relevant parameters such as wind, wave and current marine environment parameters, and the variation law of the motion is obtained, which provides a reference for the future research. In this paper, the problems related to the installation of deep-sea Cell Spar platform by using two-ship float method are studied by means of numerical simulation, and the influence of different connection modes on the installation is discussed, which enriches the installation content of the two-ship float method. It has certain reference value for the numerical calculation of offshore float installation in the future.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE95
本文编号：2482911
[Abstract]:With the increase of human demand for oil resources and the depletion of onshore resources, it is urgent to explore and exploit offshore oil and gas resources. At present, all countries in the world are vigorously developing offshore drilling and oil production platform technology, and strive to occupy a favorable position in the coming resource war. How to install the offshore platform in the designated sea area quickly, safely and economically is a research focus of the offshore construction of the platform. There are generally two kinds of offshore installation of platform: hoisting method and floating method. With the increase of installation cost, the weight of upper block and the limitation of platform structure, the application scope of traditional hoisting method is more and more limited. Therefore, float installation gradually occupies a place in offshore installation, and has been widely used at home and abroad. Among them, as a kind of float installation, double ship float installation has the advantage of not being limited by platform opening and draught, and can install large block weight, which has become the hot spot of platform offshore installation. This paper first introduces the operation process of float method installation, expounds the research status and progress of domestic and foreign scholars on float method installation, and introduces in detail the steps of double ship float method installation. Secondly, referring to the Cell Spar conceptual model suitable for the South China Sea, according to the transfer characteristics of the weight load in the process of installing the upper block by using the two-ship floating bracket method, The hydrodynamic model of the target platform in different stages of installation is established by using the hydrodynamic calculation software AQWA. Based on the three-dimensional potential flow theory, the hydrodynamic models of different stages are analyzed in frequency domain, and the additional mass coefficients of buoy barge and Spar platform during unloading are obtained. Hydrodynamic parameters such as damping coefficient and motion amplitude response operator (RAO) and their motion characteristics in regular waves. Then, on the basis of frequency domain analysis, the time domain calculation model of double ship float installation is established. The AQWA-Drift module is used to simulate the movement of the buoy barge, the upper module and the platform body in the actual installation marine environment. In this paper, the relative motion between barge and platform is compared, and the motion response of a single floating body when it is just connected is compared. The movement characteristics of the upper module of Spar platform in the installation of double ship floating bracket are analyzed from four aspects: the force comparison of the contact point at the joint and the force comparison of the mooring cable. Taking the upper load transfer 50% of the weight from the buoy barge to the main body of the platform as an example, by comparing the rigid connection, the articulation and the different incident directions of the environmental load, the numerical simulation is obtained. It is most suitable to use rigid connection mode to connect float barge and upper module at this stage of float installation. Finally, according to the foundation of the rigid connection, when the environmental load is 180 掳incident, by changing the distance between the buoy barge and the main body of the platform, The motion response of the platform body in the float installation model is predicted by the relevant parameters such as wind, wave and current marine environment parameters, and the variation law of the motion is obtained, which provides a reference for the future research. In this paper, the problems related to the installation of deep-sea Cell Spar platform by using two-ship float method are studied by means of numerical simulation, and the influence of different connection modes on the installation is discussed, which enriches the installation content of the two-ship float method. It has certain reference value for the numerical calculation of offshore float installation in the future.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE95
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