本文關鍵詞： 鉆柱 自轉(zhuǎn) 公轉(zhuǎn) 徑向運動 雙極坐標 有限體積法　出處：《燕山大學》2015年碩士論文　論文類型：學位論文

【摘要】：目前,在石油鉆井過程中,鉆柱是必不可少的井下鉆井工具。其長期浸泡在充滿鉆井液的井眼當中,靠轉(zhuǎn)盤的帶動旋轉(zhuǎn)向下鉆進,在這一過程當中,鉆柱不僅會繞自身的軸線做自轉(zhuǎn)運動,還有可能繞井眼軸線做公轉(zhuǎn)運動并產(chǎn)生徑向運動。研究鉆柱運動誘發(fā)牛頓流體流動的流動規(guī)律具有重要作用,能夠有效減少由于鉆柱渦動和屈曲而導致的鉆井事故的出現(xiàn),從而減少經(jīng)濟損失。目前國內(nèi)外學者對偏心環(huán)空流已經(jīng)進行了許多研究,并取得了一定的成果,本課題將在前人的研究成果之上,首次將鉆柱徑向運動考慮在內(nèi),建立鉆柱自轉(zhuǎn)、公轉(zhuǎn)和徑向運動誘發(fā)牛頓流體流動的數(shù)學模型,并進行求解,以期更好的研究井筒中鉆井液的流動規(guī)律,為鉆柱受力分析提供依據(jù),從而減少鉆井事故的出現(xiàn)。本文首先分析了目前國內(nèi)外學者在偏心環(huán)空流研究中存在的問題和不足之處,并針對這些問題和不足提出了本文的研究內(nèi)容以及研究方法;經(jīng)過研究分析,以慣性坐標系下的連續(xù)性方程和運動方程為基礎,建立了非慣性坐標系下的控制方程;通過基本假設,建立了鉆柱自轉(zhuǎn)、公轉(zhuǎn)和徑向運動誘發(fā)牛頓流體流動的數(shù)學模型;采用雙極坐標,將偏心環(huán)空區(qū)域轉(zhuǎn)化為了矩形區(qū)域;采用適用性較好,且具有明顯優(yōu)勢的有限體積法對建立的數(shù)學模型進行了離散,得到了離散后的數(shù)學方程;采用MATLAB軟件,對鉆柱自轉(zhuǎn)運動誘發(fā)牛頓流體流動的流場進行了分析,求出了軸向速度分布圖和切向速度分布圖,并且繪制了不同偏心距條件下的速度流線圖。采用FLUENT軟件對相同工況下的流場進行了分析,繪制了不同偏心距條件下的速度流線圖,并將兩種方法繪制的流線圖進行了對比,經(jīng)過對比發(fā)現(xiàn)這兩種方法計算結果相似,同時都發(fā)現(xiàn)只有偏心距達到一定的距離要求時才會有二次流出現(xiàn)。
[Abstract]:At present, in the process of oil drilling, drill string is an essential downhole drilling tool. The drill string can not only rotate around its axis, but also rotate around the hole axis and produce radial motion. It is very important to study the flow law of Newtonian fluid induced by drill string movement. It can effectively reduce the occurrence of drilling accidents caused by vortex and buckling of drill string and thus reduce economic losses. At present, many researches have been done on eccentric annular annulus flow at home and abroad, and some achievements have been made. In this paper, based on the previous research results, the radial movement of drill string is taken into account for the first time, and the mathematical model of Newtonian fluid flow induced by rotation, rotation and radial motion of drill string is established and solved for the first time. In order to better study the flow rule of drilling fluid in wellbore and provide the basis for the analysis of drill string force. In order to reduce the occurrence of drilling accidents. Firstly, this paper analyzes the existing problems and deficiencies of domestic and foreign scholars in the research of eccentric annulus flow. In view of these problems and shortcomings, this paper puts forward the research content and research methods; Based on the continuity equation and motion equation in inertial coordinate system, the control equation in non-inertial coordinate system is established. The mathematical models of Newtonian fluid flow induced by rotation rotation and radial motion of drill string are established by the basic assumptions. The eccentric annulus region is transformed into a rectangular region by using bipolar coordinates. The established mathematical model is discretized by using the finite volume method, which has good applicability and obvious advantages, and the mathematical equations after discretization are obtained. The flow field of Newtonian fluid flow induced by rotary movement of drill string is analyzed by MATLAB software, and the axial velocity distribution diagram and tangential velocity distribution diagram are obtained. The velocity streamline diagram under different eccentricity is drawn. The flow field under the same working condition is analyzed by FLUENT software, and the velocity streamline diagram under different eccentricity is drawn. The flow diagram drawn by the two methods is compared. The results of the two methods are similar and it is found that only when the eccentricity reaches a certain distance can there be secondary flow.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE921.2

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本文編號：1451985