本文關鍵詞：考慮液—固界面作用的微可壓縮流體的滲流理論研究　出處：《北京科技大學》2015年博士論文　論文類型：學位論文

  更多相關文章： 液固界面作用 微尺度效應 微可壓縮 非線性滲流 剩余油

【摘要】：低滲透多孔介質(zhì)中流體的流動具有非線性滲流特征,對其流動規(guī)律的描述通常是在滲流規(guī)律實驗和參數(shù)擬合的基礎上,建立非達西滲流數(shù)學模型,其結(jié)果未能揭示非線性滲流的機理和物理本質(zhì),一直缺乏從基礎理論出發(fā)的分析結(jié)果。本文從流體力學角度分析其根本原因,通過實驗分析、理論模型和數(shù)值模擬相結(jié)合的方法,建立了考慮液固界面作用的微可壓縮流體的滲流理論模型,為研究多孔介質(zhì)的非線性滲流規(guī)律奠定了理論基礎,提供了新的研究方法。 論文首先從微圓管流動實驗入手,研究流體在微尺度下的非線性流動。通過對微流動非線性的影響因素分析,發(fā)現(xiàn)非線性流動特征明顯,出現(xiàn)了啟動壓力梯度現(xiàn)象。從液固界面作用的角度出發(fā),改變了微圓管壁面的親疏水性,發(fā)現(xiàn)流體在相同管徑下的微圓管中流速得以提高,流動阻力得以降低,體現(xiàn)了液固界面作用力對流體在微圓管內(nèi)流動的重要影響。 綜合應用流體力學、滲流力學、現(xiàn)代數(shù)學、現(xiàn)代非線性力學等理論分析方法,考慮長程固液靜電力和范德華力及流體微可壓縮性的影響,建立了流體非線性運動方程組,引入渦函數(shù)和流函數(shù),利用正則攝動法求得速度和壓力分布的近似解析解。計算結(jié)果表明考慮界面力和微可壓縮性條件下流體非線性特征和微尺度效應明顯,且與微管實驗規(guī)律一致。從流體的微可壓縮性和液固界面作用力的角度揭示了產(chǎn)生非線性流動的原因。 以微管單相流動數(shù)學模型為基礎,建立了考慮液固界面作用及流體微可壓縮性的兩相非穩(wěn)態(tài)流動數(shù)學模型；利用微管兩相流動數(shù)學模型,建立了反映多孔介質(zhì)流動特征的毛管束模型,對比分析了流體的微可壓縮性和液固界面作用力對進出口端定壓、進口定流量出口定壓力兩種情況下水驅(qū)油規(guī)律的影響。 采用水驅(qū)油動態(tài)網(wǎng)絡模型,模擬了考慮液固界面作用的微可壓縮流體在網(wǎng)絡模型中的流動,分析了流體的微可壓縮性、液固界面作用力、平均喉道尺度和驅(qū)動壓力對剩余油分布類型及比例的影響。結(jié)果表明,微可壓縮性和液固界面作用對剩余油比例影響較大,以簇狀剩余油為主；平均喉道半徑越小,剩余油比例越高,以簇狀剩余油為主；當喉道半徑變大,壓力梯度變大,剩余油較少時,膜狀剩余油最難驅(qū)替。結(jié)果顯示簇狀剩余油和膜狀剩余油的形成受液固界面力的影響最大,為挖潛剩余油提供了理論依據(jù)。
[Abstract]:The flow of fluid in low permeability porous media has nonlinear seepage characteristics. The description of the flow law is usually based on the experiment of seepage law and parameter fitting, the mathematical model of non-Darcy seepage is established. The results fail to reveal the mechanism and physical nature of nonlinear seepage, and there is a lack of analysis results based on the basic theory. This paper analyzes the fundamental causes from the point of view of fluid mechanics, and analyzes them through experiments. By combining theoretical model with numerical simulation, a theoretical model of micro-compressible fluid flow considering liquid-solid interface is established, which lays a theoretical foundation for the study of nonlinear seepage law of porous media. A new research method is provided. In this paper, the nonlinear flow of microtube is studied by the experiment of microtube flow. Through the analysis of the influence factors of the nonlinear of micro-flow, it is found that the characteristics of nonlinear flow are obvious. From the point of view of liquid-solid interface, the hydrophobicity of the wall of the microtube was changed. It was found that the flow velocity of the fluid in the microtube with the same diameter was increased and the flow resistance was reduced. The effect of liquid-solid interface force on the flow of fluid in a microtube is demonstrated. The effects of long range solid-liquid hydrostatic power, van der Waals force and micro-compressibility of fluid are considered by using the theoretical analysis methods of fluid mechanics, seepage mechanics, modern mathematics and modern nonlinear mechanics. The equations of nonlinear motion of fluid are established, and vortex function and current function are introduced. The approximate analytical solution of velocity and pressure distribution is obtained by using the regular perturbation method. The results show that the nonlinear characteristics and micro-scale effects of the fluid are obvious when the interface force and the micro-compressibility are taken into account. In accordance with the experimental rule of microtubules, the causes of nonlinear flow are revealed from the point of view of fluid microcompressibility and liquid-solid interface forces. Based on the mathematical model of single-phase flow in microtubules, a mathematical model of two-phase unsteady flow considering the interaction of liquid-solid interface and the micro-compressibility of fluid is established. A capillary bundle model reflecting the flow characteristics of porous media was established by using the mathematical model of microtubule two-phase flow. The micro-compressibility of the fluid and the pressure of the liquid-solid interface on the inlet and outlet end were compared and analyzed. The influence of the water displacement law in the two situations of constant flow inlet and outlet constant pressure. The flow of micro-compressible fluid considering liquid-solid interface in the network model is simulated by using water drive oil dynamic network model. The micro-compressibility of fluid and the interaction force of liquid-solid interface are analyzed. The effects of average throat size and driving pressure on the distribution and proportion of residual oil show that micro-compressibility and liquid-solid interface have great influence on the remaining oil ratio, mainly cluster residual oil. The smaller the average throat radius, the higher the remaining oil ratio, mainly cluster residual oil. When the throat radius becomes larger, the pressure gradient becomes larger, and the remaining oil is less, the membrane residual oil is the most difficult to displace. The results show that the formation of the cluster residual oil and the film residual oil is most affected by the liquid-solid interface force. It provides a theoretical basis for tapping the remaining oil.
【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TE312

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