本文選題：微通道 + 計算流體力學　； 參考：《東北石油大學》2015年碩士論文

【摘要】：儲集石油的沉積巖中含有豐富的粘粒礦物,砂巖顆粒以及石英晶體等細小顆粒。固體微粒的存在會影響原油沿巖石孔隙運移的速度和路徑,并且由于細顆粒的沉積,也會改變巖石微孔隙的孔隙率,從而對原油運移造成影響。目前為止,針對這一問題的研究方法大都是從宏觀角度入手,很少從微尺度的角度分析研究,進行數(shù)值模擬的更是少之又少。因此,很有必要開展對石油儲層微孔隙中微細沙粒運移的模擬、分析工作。本文采用DEM-CFD方法對巖石微通道中液-固兩相流動過程進行數(shù)值模擬。在數(shù)學模型中,液相采用連續(xù)模型,顆粒相采用離散模型,并考慮了相間耦合作用。對于物理模型,分別建立了二維直微通道模型和粗糙微通道模型,研究微通道的孔隙率、液相粘度、液相速度和顆粒粒徑等因素對微通道中液-固兩相流動的影響。模擬得到了微通道內(nèi)顆粒瞬時分布狀態(tài)、顆粒運動軌跡、顆粒停留時間、顆粒軸向速度分布、液相軸向速度分布、顆粒擬溫度以及顆粒接觸力等參數(shù)的變化規(guī)律。模擬結(jié)果顯示,隨著微通道孔隙率的減小,顆粒的運動變得劇烈。而當孔隙率增大時,由于碰撞概率降低,顆粒接觸力的平均值和標準方差均減小。對于液相的流動,隨著孔隙率的增大,液相的軸向速度波動減少,并趨于穩(wěn)定;當增大液相粘度時,顆粒停留時間和顆粒的法向接觸力會增大,顆粒的擬溫度總體上是呈下降的趨勢;當增大液相入口速度時,顆粒的瞬時軸向速度、顆粒擬溫度以及接觸力均是增大,而顆粒停留時間則是減小;而當運動顆粒的粒徑增加時,顆粒的瞬時軸向速度會減小,并導致顆粒停留時間的延長。
[Abstract]:The sedimentary rocks of reservoir oil contain rich clay minerals, sandstone grains and fine grains such as quartz crystals.The existence of solid particles will affect the migration velocity and path of crude oil along the rock pores, and because of the fine grain deposition, it will also change the porosity of rock micropores, thus affecting the oil migration.So far, most of the research methods for this problem are from the macro point of view, rarely from the micro-scale analysis, numerical simulation is rare.Therefore, it is necessary to simulate and analyze the migration of fine sand particles in micropores of petroleum reservoir.In this paper, DEM-CFD method is used to simulate the liquid-solid two-phase flow in rock microchannels.In the mathematical model, the liquid phase is continuous, the granular phase is discrete, and the coupling between phases is considered.For physical models, two-dimensional direct microchannel model and rough microchannel model were established to study the effects of porosity, liquid viscosity, liquid velocity and particle size on liquid-solid two-phase flow in microchannels.The variations of particle instantaneous distribution, particle trajectory, particle residence time, particle axial velocity distribution, liquid phase axial velocity distribution, particle pseudo-temperature and particle contact force were obtained by simulation.The simulation results show that the particle motion becomes violent with the decrease of microchannel porosity.However, when the porosity increases, the average value and standard variance of particle contact force decrease due to the decrease of collision probability.For liquid phase flow, with the increase of porosity, the axial velocity fluctuation of liquid phase decreases and tends to be stable, and when the liquid viscosity increases, the particle residence time and the normal contact force of particles increase.When the inlet velocity of liquid phase is increased, the instantaneous axial velocity, particle pseudo-temperature and contact force increase, while the particle residence time decreases.When the particle size increases, the instantaneous axial velocity decreases and the particle residence time is prolonged.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE31

【共引文獻】

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1 王海;75t/h秸稈鍋爐過熱器積灰數(shù)值模擬研究[D];東北電力大學;2011年

2 劉維岐;600MW煙煤鍋爐改燒褐煤的數(shù)值研究[D];東北電力大學;2014年

3 俞偉偉;煤粉顆粒群射流著火特性實驗研究[D];清華大學;2013年

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本文編號：1763643