摘要

隨著世界經(jīng)濟(jì)的高速發(fā)展，能源和資源短缺問題日益突出。由于陸地和近海油氣資源的逐漸減少,為滿足飛速增長的能源需求, 世界發(fā)達(dá)國家將油氣資源的開發(fā)重點(diǎn)轉(zhuǎn)向了深海,深水半潛平臺(tái)應(yīng)運(yùn)而生。第六代深水半潛平臺(tái)是一個(gè)典型代表，其作業(yè)水深達(dá)3000米，鉆井深度10000米，是開發(fā)海洋油氣資源的重要技術(shù)性裝備，也是一個(gè)國家裝備制造綜合技術(shù)的重要體現(xiàn)，研究、設(shè)計(jì)、制造半潛平臺(tái)具有非常重要的意義。

管線是深水半潛平臺(tái)中非常重要的部分，由于平臺(tái)漂浮于海上，環(huán)境條件惡劣，受力復(fù)雜，再加上系統(tǒng)復(fù)雜眾多，工作壓力高等因素，對(duì)平臺(tái)管線進(jìn)行應(yīng)力分析成為平臺(tái)設(shè)計(jì)和建造的關(guān)鍵點(diǎn)。

本文利用CAESARII應(yīng)力分析軟件，著重從管路應(yīng)力方面對(duì)深水半潛平臺(tái)關(guān)鍵管系高壓泥漿系統(tǒng)、高壓空氣系統(tǒng)、鉆井液壓系統(tǒng)和玻璃鋼壓載水系統(tǒng)做了分析研究，主要研究內(nèi)容如下：

1、論述總結(jié)了深水半潛平臺(tái)關(guān)鍵管系應(yīng)力分析的意義及目的，在管道應(yīng)力分析的理論部分，詳細(xì)說明了規(guī)范ASME B31.3對(duì)應(yīng)力分析的評(píng)判準(zhǔn)則，給出了一次應(yīng)力和二次應(yīng)力校核條件。整理了管系應(yīng)力分析工作的具體任務(wù)和過程，論述了分析過程的各個(gè)環(huán)節(jié)。

2、運(yùn)用CAESAR II管道分析軟件建立半潛平臺(tái)關(guān)鍵系統(tǒng)應(yīng)力分析模型，并進(jìn)行計(jì)算。對(duì)現(xiàn)行設(shè)計(jì)下管路系統(tǒng)的一次應(yīng)力和二次應(yīng)力水平進(jìn)行校核，驗(yàn)證了現(xiàn)行設(shè)計(jì)的可行性。

3、針對(duì)壓載水系統(tǒng)的重要性，對(duì)壓載水系統(tǒng)單獨(dú)進(jìn)行了水錘載荷動(dòng)態(tài)分析和壓載水離心泵進(jìn)出口載荷評(píng)估，提高系統(tǒng)安全性。

4、最后作為一個(gè)擴(kuò)展，對(duì)高壓泥漿系統(tǒng)進(jìn)行了靜態(tài)疲勞分析，加載系統(tǒng)預(yù)期的循環(huán)次數(shù)，設(shè)置了三個(gè)疲勞工況。通過對(duì)三個(gè)疲勞工況單獨(dú)作用和累計(jì)作用的分析，得出系統(tǒng)的應(yīng)力在合理的范圍內(nèi)。


關(guān)鍵詞：半潛平臺(tái)；管線應(yīng)力分析；CAESAR II；水錘；疲勞分析

 




Abstract

With the rapid development of world economy, the sources of energy and resource issues have become increasingly prominent. Because the land and offshore oil and gas resources are gradually reduced, in order to meet the growing demand for energy, the world’s advanced states focus on the deep sea oil gas resource development, so the deepwater semi-submersible platform emerge as the times required. The sixth generation of deepwater semi submersible platform is a typical representative, its operating water depth is 3000 meters, drilling depth is 10000 meters, which is an important technical equipment for the development of offshore oil and gas resources, also is an important reflection of a national equipment manufacturing integrated technology level, So the research, design and manufacture of semi submersible platform have very important significance.

The pipeline is a very important part of the deepwater semi-submersible platform, due to the platform floating on the sea, bad environmental conditions, complex stress, coupled with the system is complex and numerous, and higher working pressure, the pipeline stress analysis of the platform become a key point in the platform’s design and construction.

This article use CAESAR II software to analyze the pipelines stress of semi submersible platform, the pipelines mainly include high pressure mud system, high pressure air system, drilling hydraulic system and FRP ballast water system, the main research contents are as follows:

1、This paper summarize the meaning and purpose of the semi submersible platform key pipelines’ stress analysis. In the pipe stress analysis theory, a detailed description of standard B31.3 stress analysis criterion, given primary stress and secondary stress check condition. Combing the pipe stress analysis tasks and process, and each link of the analysis process were discussed in detail.

2、This paper use CAESAR II to establish the models of the semi-submersible platform key system, and calculate the result to check the primary stress and secondary stress levels, verified the feasibility of the design current.

3、Aiming at the importance of ballast water system, this article carry out ballast water system water hammer load dynamic and ballast water centrifugal pump import and export load assessment, improved system security.

4、Finally, as an extension to high pressure mud system, this paper implement static fatigue analysis of high pressure system, loading system expected cycle numbers, setting three fatigue conditions. Through the three fatigue conditions alone and cumulative effects analysis, obtained the system stress in a reasonable range.

In conclusion, this paper preliminarily explored some feasible semi submersible platform piping stress analysis method and obtained some useful conclusions, which laid a good foundation for engineering application and further study in future.


Key word: semi submersible; stress analysis of pipelines; CAESAR II; water hammer; fatigue analysis

 


目錄

摘要 I

Abstract II

第一章 緒論  1

1.1研究背景及意義  1

1.2國內(nèi)外研究概況  2

1.2.1 管道應(yīng)力分析的發(fā)展  2

1.2.2管路應(yīng)力分析的現(xiàn)狀  4

1.3論文的研究內(nèi)容及方法  6

第二章 管道應(yīng)力分析理論  7

2.1 管道應(yīng)力分析的評(píng)判準(zhǔn)則  7

2.1.1 管道的..