本文選題：多孔介質(zhì)　切入點(diǎn)：CFD-DEM　出處：《東北石油大學(xué)》2017年碩士論文

【摘要】：巖石儲油層地質(zhì)構(gòu)造是多孔性的,儲集空間是油氣賦存的場所,也是流體流動的通道,狹義上的儲集巖(層)的孔隙定義為巖石中顆粒間,顆粒內(nèi)和填隙物內(nèi)的空隙,孔隙結(jié)構(gòu)特性決定了儲存流體的數(shù)量,因此,巖石儲層多孔介質(zhì)的研究對石油工程領(lǐng)域具有重大的意義。本文以石油儲層多孔介質(zhì)中油滴和砂粒的流動為研究對象,在微尺度內(nèi)模擬多孔介質(zhì)內(nèi)顆粒流動特性。本文運(yùn)用CFD-DEM方法對多孔介質(zhì)內(nèi)液相和顆粒相流動過程進(jìn)行數(shù)值模擬。采用Euler方法研究液相流動,采用離散方法研究顆粒流動,并用Gidaspow曳力模型考慮液固兩相相間作用,為考慮顆粒間碰撞引起的形變現(xiàn)象,顆粒相采用軟球模型。物理模型分別建立了簡單一字型多孔介質(zhì)模型和分枝型多孔介質(zhì)模型。研究多孔介質(zhì)的孔隙率、液相粘度、液相速度、砂粒密度、以及油砂比等因素對多孔介質(zhì)內(nèi)流動的影響,將結(jié)果進(jìn)行對比分析,得出液相和顆粒相運(yùn)動規(guī)律。模擬結(jié)果表明,顆粒在多孔介質(zhì)內(nèi)運(yùn)動過程中,液相對密度小、粒徑大的油顆粒運(yùn)動影響較大。多孔介質(zhì)孔隙率增大時(shí),顆粒在多孔介質(zhì)內(nèi)運(yùn)動空間變大,顆粒停留時(shí)間增長;適當(dāng)增大液相入口速度,顆粒運(yùn)動速率明顯增大,顆粒擬溫度升高,脈動程度增加;液相粘度的增大,會阻礙顆粒的運(yùn)動,影響顆粒在多孔介質(zhì)中的分散程度;兩種顆粒的密度差越大,多孔介質(zhì)內(nèi)顆粒呈現(xiàn)的旋轉(zhuǎn)作用越強(qiáng)烈;不同油砂顆粒數(shù)之比對多孔介質(zhì)內(nèi)的顆粒運(yùn)動影響明顯,油砂比為1:2時(shí)的顆粒整體運(yùn)移速度最快,油砂比為1:3的顆粒運(yùn)移最慢,且砂顆粒容易沉積在多孔介質(zhì)底部。對于分枝型多孔介質(zhì)模型,顆粒在分枝通道分流效果明顯。下分枝通道顆粒數(shù)量多、流動速度快,上分枝通道顆粒數(shù)量小、運(yùn)動速度慢,且上分枝通道有部分砂顆粒出現(xiàn)回流的現(xiàn)象�？紫堵试酱�,顆粒分散程度越大,顆粒停留時(shí)間增長;液體粘度能有效改變顆粒分布情況,液體粘度增大,顆粒運(yùn)動呈對稱分布,粘度的增加會在一定程度上阻礙顆粒的運(yùn)動,顆粒速度脈動減弱,擬溫度降低;液體入口速度越大,在主通道處顆粒旋轉(zhuǎn)運(yùn)動越劇烈,且在下分枝通道運(yùn)動的顆粒數(shù)量明顯增多;不同油砂比對顆粒旋轉(zhuǎn)運(yùn)動影響較大,對比油砂比為1:2與油砂比為2:1兩種情況的顆粒瞬時(shí)分布圖,發(fā)現(xiàn)顆粒在主通道內(nèi)會呈現(xiàn)出方向相反的旋轉(zhuǎn)運(yùn)動;對于同一模型,相鄰旋轉(zhuǎn)區(qū)的顆粒運(yùn)動方向也相反。
[Abstract]:The geological structure of rock reservoir is porous, and the reservoir space is the place where oil and gas are stored and the passage of fluid flow. The pore of reservoir rock (reservoir) in narrow sense is defined as the void between particles in rock, in particle and in filling material.Pore structure characteristics determine the amount of fluid stored, therefore, the study of porous media in rock reservoir is of great significance in petroleum engineering field.In this paper, the flow of oil droplets and sand particles in porous media of petroleum reservoir is studied. The flow characteristics of particles in porous media are simulated in microscale.In this paper, CFD-DEM method is used to simulate the liquid phase and particle phase flow in porous media.The liquid phase flow is studied by Euler method, the particle flow is studied by discrete method, and the interaction between liquid and solid phases is considered by Gidaspow drag model. In order to consider the deformation phenomenon caused by collision between particles, the soft sphere model is used to study the particle phase.The physical model and the branched porous media model are established respectively.The effects of porosity, liquid viscosity, liquid velocity, sand density and oil-sand ratio on the flow in porous media were studied. The results were compared and analyzed.The simulation results show that the oil particles with small relative density and large particle size have great influence on the movement of oil particles in porous media.When the porosity of porous media increases, the moving space of particles in porous media becomes larger and the residence time of particles increases, and when the inlet velocity of liquid phase is properly increased, the particle moving rate increases obviously, the particle pseudo temperature increases and the pulsation degree increases.The increase of liquid viscosity will hinder the movement of particles and affect the degree of dispersion of particles in porous media, the greater the density difference between the two particles, the stronger the rotating action of particles in porous media.The effect of different ratio of oil sand particle number on particle movement in porous media is obvious. When the oil sand ratio is 1:2, the whole particle migration speed is the fastest, and the grain migration at 1:3 oil sand ratio is the slowest, and the sand particles are easy to deposit at the bottom of porous media.For the branched porous media model, the particle shunt effect in the branching channel is obvious.The number of particles in the lower branch channel is large, the velocity of flow is fast, the number of particles in the upper branching channel is small, the moving speed is slow, and some sand particles in the upper branching channel appear the phenomenon of reflux.The larger the porosity, the greater the particle dispersion, the longer the particle residence time, the more the liquid viscosity can change the particle distribution, the larger the liquid viscosity is, the more the particle motion is symmetrically distributed, and the increase of the viscosity will hinder the particle movement to a certain extent.The particle velocity pulsation is weakened and the pseudo temperature is decreased. The larger the liquid inlet velocity is, the more violent the particle rotation is at the main channel, and the number of particles moving in the lower branch channel is obviously increased, and the different oil sand ratio has a great influence on the particle rotation motion.When the oil sand ratio is 1:2 and the oil sand ratio is 2:1, it is found that the particles in the main channel show a rotating motion in opposite direction, and for the same model, the movement direction of the particles in the adjacent rotation zone is also opposite.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE311

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