微通道内液固两相流动特性研究

发布时间：2018-04-17 12:39

本文选题：微通道 + 计算流体力学　；参考：《东北石油大学》2015年硕士论文

【摘要】：储集石油的沉积岩中含有丰富的粘粒矿物,砂岩颗粒以及石英晶体等细小颗粒。固体微粒的存在会影响原油沿岩石孔隙运移的速度和路径,并且由于细颗粒的沉积,也会改变岩石微孔隙的孔隙率,从而对原油运移造成影响。目前为止,针对这一问题的研究方法大都是从宏观角度入手,很少从微尺度的角度分析研究,进行数值模拟的更是少之又少。因此,很有必要开展对石油储层微孔隙中微细沙粒运移的模拟、分析工作。本文采用DEM-CFD方法对岩石微通道中液-固两相流动过程进行数值模拟。在数学模型中,液相采用连续模型,颗粒相采用离散模型,并考虑了相间耦合作用。对于物理模型,分别建立了二维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、液相速度和颗粒粒径等因素对微通道中液-固两相流动的影响。模拟得到了微通道内颗粒瞬时分布状态、颗粒运动轨迹、颗粒停留时间、颗粒轴向速度分布、液相轴向速度分布、颗粒拟温度以及颗粒接触力等参数的变化规律。模拟结果显示,随着微通道孔隙率的减小,颗粒的运动变得剧烈。而当孔隙率增大时,由于碰撞概率降低,颗粒接触力的平均值和标准方差均减小。对于液相的流动,随着孔隙率的增大,液相的轴向速度波动减少,并趋于稳定;当增大液相粘度时,颗粒停留时间和颗粒的法向接触力会增大,颗粒的拟温度总体上是呈下降的趋势;当增大液相入口速度时,颗粒的瞬时轴向速度、颗粒拟温度以及接触力均是增大,而颗粒停留时间则是减小;而当运动颗粒的粒径增加时,颗粒的瞬时轴向速度会减小,并导致颗粒停留时间的延长。
[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.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE31

【共引文献】