本文選題：深水管柱 + 流固耦合�。� 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：深水油氣測(cè)試中,由于控制系統(tǒng)的操作或油氣流體的壓力脈動(dòng),導(dǎo)致流體運(yùn)動(dòng)狀態(tài)發(fā)生改變,誘發(fā)管柱系統(tǒng)的變形和振動(dòng),此類(lèi)管柱振動(dòng)又反作用于流體,從而加劇管柱系統(tǒng)振動(dòng)效應(yīng)。這種流體流動(dòng)、壓力波動(dòng)和管柱振動(dòng)的相互作用的方式被稱(chēng)為流固耦合。 受內(nèi)外激勵(lì)的影響,深水測(cè)試管柱在流固耦合作用下容易發(fā)生振動(dòng),其振動(dòng)形式主要體現(xiàn)在三方面：第一,突然關(guān)井時(shí),井口處油氣流速瞬間變?yōu)榱?使測(cè)試管柱產(chǎn)生環(huán)向應(yīng)變,引起流體壓力脈動(dòng)和管柱應(yīng)力波動(dòng),誘發(fā)管柱振動(dòng)；第二,外界荷載頻率與測(cè)試管柱系統(tǒng)頻率相等,測(cè)試管柱系統(tǒng)發(fā)生共振現(xiàn)象；第三,管柱內(nèi)流體流速超過(guò)臨界流速,誘發(fā)管柱在平面方向發(fā)生振動(dòng),從而導(dǎo)致管柱的振顫失穩(wěn)；這三種由流體和管柱相互作用誘發(fā)的管柱振動(dòng),都會(huì)從不同程度上影響管柱工作性能,更甚者會(huì)造成管柱結(jié)構(gòu)的破壞。因此,在管柱設(shè)計(jì)過(guò)程中應(yīng)考慮管柱與流體的相互作用,從而盡量避免由流固耦合誘發(fā)的管柱失效。 本文首先以Timoshenko梁理論為基礎(chǔ),建立了測(cè)試管柱系統(tǒng)在海洋環(huán)境下的靜力模型,運(yùn)用有限差分法結(jié)合深水測(cè)試管邊界條件計(jì)算管柱在海洋環(huán)境下的橫向變形。然后結(jié)合深水管柱變形特點(diǎn),采用以直管代替曲管方式,分別從流固耦合時(shí)域分析和頻域分析出發(fā),建立不同的流固耦合分析模型,計(jì)算得出深水管柱系統(tǒng)在考慮流固耦合作用下的應(yīng)力波動(dòng)曲線和自由振動(dòng)頻率。最后通過(guò)VISUAL BASIC和FORTRAN聯(lián)合編程技術(shù),研制一款適用于管柱流固耦合動(dòng)力學(xué)分析的應(yīng)用軟件,從而實(shí)現(xiàn)其在工程中的運(yùn)用。 本文在對(duì)深水管柱流固耦合分析過(guò)程中,采用建立不同的計(jì)算模型分別進(jìn)行分析。時(shí)域分析方面,從結(jié)構(gòu)自身的本構(gòu)關(guān)系和彈性力學(xué)入手,建立考慮管柱泊松耦合、連接耦合的14方程力學(xué)模型,再采用以直代曲方式簡(jiǎn)化了彎段管柱力學(xué)邊界,運(yùn)用特征線法計(jì)算了測(cè)試管柱動(dòng)力響應(yīng)曲線。頻域分析方面,建立了測(cè)試管柱橫向和軸向的動(dòng)力方程,通過(guò)數(shù)學(xué)物理方程推導(dǎo)出管柱流固耦合振動(dòng)傳遞矩陣,最后采用試值法計(jì)算管柱自由振動(dòng)頻率。 本文研究結(jié)果對(duì)分析管柱與流體的耦合振動(dòng)特性,預(yù)測(cè)其振動(dòng)響應(yīng),選擇抑制或減小系統(tǒng)振動(dòng)的措施,保障測(cè)試管柱系統(tǒng)的正常運(yùn)行具有重要的理論意義和實(shí)際意義。
[Abstract]:In deep water oil and gas testing, the operation of the control system or the pressure pulsation of the oil and gas fluid lead to the change of the fluid motion state, which induces the deformation and vibration of the string system, and this kind of string vibration reacts on the fluid. Thus, the vibration effect of the string system is aggravated. The interaction of fluid flow, pressure fluctuation and string vibration is called fluid-solid coupling. Under the influence of internal and external excitation, deep water test string is easy to vibrate under fluid-solid coupling. The vibration forms are mainly reflected in three aspects: first, when the well shuts suddenly, the velocity of oil and gas at the well head turns to zero instantly. Causes the test string to produce the circumferential strain, causes the fluid pressure pulsation and the string stress fluctuation, induces the string vibration; second, the external load frequency is equal to the test string system frequency, the test string system produces the resonance phenomenon; third, The velocity of fluid in the string exceeds the critical velocity, which induces the vibration of the string in the plane direction, which leads to the vibration instability of the string; these three kinds of vibration induced by the interaction between fluid and string, It will affect the working performance of the string to some extent, and even cause the damage of the string structure. Therefore, the interaction between the string and the fluid should be considered in the design of the string so as to avoid the failure of the string induced by the fluid-solid coupling as far as possible. In this paper, based on Timoshenko beam theory, the static model of test string system in marine environment is established, and the transverse deformation of pipe string in ocean environment is calculated by using finite difference method combined with the boundary condition of deep water test pipe. Then according to the deformation characteristics of deep water pipe string, different fluid-solid coupling analysis models are established based on time-domain and frequency-domain analysis of fluid-solid coupling, respectively, using straight pipe instead of curved tube. The stress fluctuation curve and free vibration frequency of deep water pipe string system considering fluid-solid coupling are obtained. Finally, an application software for the analysis of fluid-solid coupling dynamics of pipe columns is developed by using the combined programming technology of VISUAL BASIC and FORTRAN, and the application of the software in engineering is realized. In this paper, different calculation models are used to analyze the fluid-solid coupling of deep water pipe string. In time domain analysis, starting with the constitutive relation and elastic mechanics of the structure itself, a mechanical model of 14 equations considering the Poisson coupling and coupling of the pipe string is established, and then the mechanical boundary of the curved pipe string is simplified by means of direct curvature. The characteristic line method is used to calculate the dynamic response curve of the test string. In terms of frequency domain analysis, the dynamic equations of lateral and axial direction of the test string are established, the fluid-solid coupling vibration transfer matrix of the string is derived by mathematical and physical equations, and the free vibration frequency of the string is calculated by the method of trial value. The results of this paper have important theoretical and practical significance for analyzing the coupled vibration characteristics of string and fluid, predicting its vibration response, selecting measures to suppress or reduce the vibration of the system, and ensuring the normal operation of the test string system.
【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】：2015
【分類(lèi)號(hào)】：TE953

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