本文選題：鉆井隔水管 + 硬懸掛�。� 參考：《上海交通大學(xué)》2015年碩士論文

【摘要】：鉆井隔水管是連接鉆井平臺(tái)與井口的重要且最易發(fā)生疲勞破壞的管柱結(jié)構(gòu),跨越整個(gè)水體區(qū)域,在深水中受到波浪與海流的作用,極易引發(fā)結(jié)構(gòu)動(dòng)態(tài)響應(yīng)及渦激振動(dòng),導(dǎo)致強(qiáng)度破壞或疲勞破壞。而在遭遇臺(tái)風(fēng)時(shí),基于安全性考慮要求鉆井平臺(tái)懸掛隔水管提前撤離,隔水管在洋流和平臺(tái)航行速度的共同影響下存在安全隱患。本文采用有限元軟件對(duì)硬懸掛隔水管系統(tǒng)的動(dòng)力學(xué)問題進(jìn)行模擬,研究懸掛長度、航速、航向?qū)?dòng)力學(xué)響應(yīng)的影響,對(duì)避臺(tái)風(fēng)撤離時(shí)的硬懸掛隔水管進(jìn)行可行性分析。研究表明:隨著航速增加,隔水管在運(yùn)動(dòng)時(shí)所受到的動(dòng)載荷增大,需要減小隔水管的懸掛長度;隨著航向角增大,平臺(tái)由順流航行變成逆流航行,隔水管受到的環(huán)境載荷增大,安全性降低。采用軟件Shear7對(duì)硬懸掛隔水管避臺(tái)風(fēng)航行時(shí)渦激振動(dòng)進(jìn)行數(shù)值計(jì)算,分析了實(shí)際尺寸隔水管系統(tǒng)在避臺(tái)風(fēng)撤離時(shí)在不同航行條件及不同懸掛長度下的渦激振動(dòng)響應(yīng)。隔水管并非越短越好,要綜合考慮洋流剖面、隔水管配置和平臺(tái)航行的影響;在不同懸掛長度及航行條件下的VIV響應(yīng),在撤離作業(yè)前應(yīng)盡量避免在高流速區(qū)布置浮力單根。采用FLUENT結(jié)合UDF,在深水或超深水環(huán)境中,針對(duì)鉆井隔水管的渦激振動(dòng)響應(yīng),在二維空間中模擬1DOF和2DOF的流固耦合問題。分析了1DOF和2DOF下的渦激振動(dòng)特性,得到了實(shí)際尺寸隔水管的升力系數(shù)、阻力系數(shù)和頻率特征。隔水管渦激振動(dòng)的振幅、振動(dòng)頻率、升阻力系數(shù)與約化速度有較大關(guān)系。在鎖定區(qū)范圍內(nèi),隔水管渦激振動(dòng)振幅、升力系數(shù)、阻力系數(shù)均較大,最大升阻力系數(shù)幅值可達(dá)到3.0-4.0,這遠(yuǎn)大于規(guī)范中選取的升力系數(shù)和阻力系數(shù)。
[Abstract]:Drilling riser is an important string structure which connects drilling platform and wellhead and is most vulnerable to fatigue damage. It crosses the whole water area and is subjected to waves and currents in deep water, which can easily cause dynamic response and vortex-induced vibration of the structure. Cause strength damage or fatigue failure. In the event of typhoon, due to safety considerations, the drilling platform hoisting riser is required to withdraw ahead of time, and the riser has hidden dangers under the influence of ocean current and platform navigation speed. In this paper, the finite element software is used to simulate the dynamic problems of the hard suspension riser system. The effects of suspension length, speed and course on the dynamic response are studied, and the feasibility analysis of the hard suspension riser during the evacuation of typhoon is carried out. The results show that with the increase of the speed, the dynamic load of the riser increases and the suspension length of the riser needs to be reduced. With the increase of the heading angle, the platform changes from downstream navigation to counter-current navigation, and the environmental load on the riser increases. Safety is reduced. By using software Shear7, the vortex-induced vibration of a hard-suspended riser during typhoon avoidance was calculated. The vortex-induced vibration response of the riser system under different sailing conditions and different suspension lengths during typhoon avoidance was analyzed. The shorter the riser the better, the influence of ocean current profile, riser configuration and platform navigation should be taken into account, and the VIV response under different suspension length and navigation conditions should be avoided in the high velocity zone before evacuation. The fluid-structure coupling problem of 1DOF and 2DOF is simulated in two-dimensional space by using fluent and UDF in deep water or ultra-deep water environment, aiming at the vortex-induced vibration response of drilling riser. The vortex-induced vibration characteristics of 1 DOF and 2 DOF are analyzed, and the lift coefficient, resistance coefficient and frequency characteristics of the actual size riser are obtained. The amplitude, vibration frequency and drag coefficient of vortex induced vibration of riser are related to the reduction velocity. In the locking region, the amplitude of vortex-induced vibration, lift coefficient and resistance coefficient of riser are larger, and the amplitude of maximum lift resistance coefficient can reach 3.0-4.0, which is much larger than the lift coefficient and drag coefficient selected in the specification.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE951

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本文編號(hào)：2115404