本文選題：深水鉆井 + 隔水管　； 參考：《西南石油大學(xué)》2016年碩士論文

【摘要】：深海油氣資源勘探與開(kāi)發(fā)已經(jīng)逐步成為國(guó)內(nèi)外油氣工業(yè)發(fā)展的主趨向。海上鉆井相對(duì)陸地鉆井難度更大、花費(fèi)更高,復(fù)雜、惡劣的深水環(huán)境對(duì)海洋石油鉆井裝備提出了更高的要求。深水鉆井隔水管是連接海上鉆井平臺(tái)和海底井口裝置的關(guān)鍵設(shè)備,起著隔離海水、形成鉆井液循環(huán)通道的作用,并為鉆具的下入和收回提供導(dǎo)向。隨著海洋石油鉆井作業(yè)水深的增加,隔水管的受力形式也因整體長(zhǎng)度增長(zhǎng)變得更加復(fù)雜,由波流作用導(dǎo)致的疲勞破壞問(wèn)題日益突出,嚴(yán)重影響隔水管的國(guó)產(chǎn)化研究與應(yīng)用。為此,本文開(kāi)展了深水鉆井隔水管力學(xué)特性與渦激振動(dòng)研究,主要完成了以下幾方面的研究工作：(1)完成了國(guó)內(nèi)外鉆井隔水管系統(tǒng)組成、環(huán)境載荷、工況參數(shù)、力學(xué)性能、渦激振動(dòng)及其渦激振動(dòng)抑制裝置等研究資料的收集與分析,提出了本文的研究方案和思路。(2)分析了深水鉆井隔水管單元力學(xué)模型,建立了平衡微分方程。通過(guò)OrcaFlex軟件建立了1200m水深隔水管系統(tǒng)的分析模型,進(jìn)行了隔水管靜力與動(dòng)力響應(yīng)對(duì)比分析,為后文參數(shù)條件選取提供了理論依據(jù)。研究了隔水管壁厚、頂張力、鉆井液密度等參數(shù)變化對(duì)隔水管固有頻率的影響,為渦旋脫落頻率的分析研究提供了對(duì)比依據(jù),得到了渦激誘發(fā)振動(dòng)是研究隔水管疲勞損壞的重要因素,為本文的研究指明了研究方向。(3)開(kāi)展了深水鉆井隔水管受環(huán)境因素和作業(yè)因素影響的參數(shù)敏感性分析,得到了不同因素變化對(duì)隔水管動(dòng)態(tài)響應(yīng)的作用規(guī)律。在此基礎(chǔ)上,對(duì)關(guān)鍵性影響因素進(jìn)行了多敏感性參數(shù)的正交分析,得到了各關(guān)鍵性因素對(duì)深水鉆井隔水管系統(tǒng)剛度和強(qiáng)度的影響規(guī)律,為隔水管渦激振動(dòng)及其抑制裝置研究提供了理論依據(jù)。(4)利用Fluent軟件建立了深水鉆井隔水管二維繞流數(shù)值模型,研究了不同流速下隔水管的繞流流場(chǎng)特點(diǎn)、升阻力系數(shù)和渦旋脫落頻率的變化規(guī)律,得到了渦激振動(dòng)對(duì)隔水管不同深度下的影響情況,為隔水管渦激抑制裝置的研究提供了理論依據(jù)。(5)研究設(shè)計(jì)了一種新型渦激抑制裝置。在充分研究現(xiàn)有渦激抑制裝置的基礎(chǔ)上,結(jié)合渦激誘發(fā)振動(dòng)機(jī)理設(shè)計(jì)了一種帶弧形尾翼的渦激抑制裝置,并進(jìn)行了結(jié)構(gòu)分析與優(yōu)化,提高了新型渦激抑制裝置的抑制效率,使該渦激抑制裝置具有良好的工程應(yīng)用價(jià)值及廣闊的應(yīng)用前景。總之,本文的研究工作對(duì)深水鉆井隔水管的力學(xué)特性、渦激振動(dòng)及渦激振動(dòng)抑制裝置研究提供了技術(shù)支持與理論指導(dǎo),對(duì)隔水管設(shè)計(jì)和安全運(yùn)行具有重要指導(dǎo)意義,將進(jìn)一步推動(dòng)深水鉆井隔水管的國(guó)產(chǎn)化研究與工業(yè)應(yīng)用。因此,本文的研究工作不僅具有重要的理論意義和學(xué)術(shù)價(jià)值,而且具有廣泛的應(yīng)用前景。
[Abstract]:Exploration and development of deep-sea oil and gas resources have gradually become the main trend of oil and gas industry development at home and abroad. Offshore drilling is more difficult, more expensive, more complex, and the bad deep-water environment has put forward higher requirements for offshore oil drilling equipment. Deep-water drilling riser is the key equipment to connect offshore drilling platform and undersea wellhead device. It plays the role of isolating seawater, forming drilling fluid circulation channel, and providing guidance for drilling tool entry and recovery. With the increase of water depth in offshore oil drilling operation, the stress form of riser becomes more complex because of the increase of integral length, and the fatigue failure caused by wave and current is becoming more and more serious, which seriously affects the domestic research and application of riser. In this paper, the mechanical characteristics and vortex-induced vibration of deepwater drilling riser have been studied. The following research work has been done: 1) the composition of drilling riser system at home and abroad, environmental load, operating condition parameters, mechanical properties, etc. Based on the collection and analysis of the research data of vortex-induced vibration and vortex-induced vibration suppression device, the research scheme and train of thought of this paper are put forward. The mechanical model of deep water drilling riser unit is analyzed, and the equilibrium differential equation is established. The analysis model of 1200m deep riser system is established by OrcaFlex software, and the static and dynamic responses of the riser are compared and analyzed, which provides a theoretical basis for the selection of parameter conditions. The influence of wall thickness, top tension and drilling fluid density on the natural frequency of riser is studied, which provides a comparative basis for the analysis and study of vortex shedding frequency. It is concluded that vortex induced vibration is an important factor to study fatigue damage of riser, and the research direction is pointed out in this paper. The sensitivity analysis of parameters of deepwater drilling riser affected by environmental and operational factors is carried out. The effects of different factors on the dynamic response of the riser are obtained. On the basis of this, the orthogonal analysis of several sensitive parameters is carried out for the key factors, and the influence law of the key factors on the stiffness and strength of the deep water drilling riser system is obtained. This paper provides a theoretical basis for the study of vortex-induced vibration of riser and its suppression device. Using Fluent software, a two-dimensional numerical model of flow around the riser of deep water drilling is established, and the characteristics of the flow field around the riser under different velocity are studied. The influence of vortex-induced vibration on the riser at different depths is obtained by the variation of the coefficient of lift resistance and the frequency of vortex shedding. A new type of vortex suppression device is designed for the study of vortex suppression device of riser. Based on the research of the existing vortex suppression devices, a vortex excitation suppression device with arc tail is designed in combination with the vortex induced vibration mechanism. The structure analysis and optimization are carried out to improve the suppression efficiency of the new type of vortex suppression device. The vortex suppression device has good engineering application value and broad application prospect. In a word, the research work in this paper provides technical support and theoretical guidance for the study of mechanical characteristics, vortex-induced vibration and vortex-induced vibration suppression devices of deep water drilling risers, and has important guiding significance for the design and safe operation of risers. It will further promote the domestic research and industrial application of deepwater drilling riser. Therefore, the research of this paper not only has important theoretical significance and academic value, but also has a wide application prospect.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TE951

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本文編號(hào)：1962599