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多孔介質細觀流動理論研究進展

Review on mesoscopic flow theory in porous media

  • 摘要: 首先,從理論分析、實驗研究和數值模型三個方面概述了當前多孔介質細觀流動的研究現狀,重點圍繞納微孔隙中流體流動界面作用與細觀力學特性關系及表征、細觀?宏觀網絡仿真模擬、細觀尺度流體(油/水、氣/水)流動細觀動力學機制及數學模型等關鍵問題展開論述。在此基礎上介紹了當前細觀流動界面作用與細觀力學特性研究情況,明確了細觀尺度流體非線性流動機理,構建了反映微觀力作用下細觀尺度流動的數學模型,形成了網絡仿真模擬方法。將為非常規油氣開發過程中揭示影響流動細觀成因,進一步闡明不同條件下的動用機理,確定高效開發方法提供指導,同時促進滲流力學學科的發展,具有重要的理論和現實意義。

     

    Abstract: Porous media are widely found in underground rocks, biomimetic, and engineering materials. However, the current flow theory of fluids (liquid and gas, etc.) is incomplete to study flows in small and complex pores, thus a new theory is urgently needed for studying a large number of fluid flows in porous media. The theory of meso-scale flow in porous media is a “mysterious key” to unlock the flow of nano-micron porous media. At present, a large number of fluid flow problems need an immediate solution in porous media such as shale oil and gas development, soil seepage, human capillary network, and carbon nanotube (CNT). With the advancement of world petroleum engineering technology, unconventional oil and gas reservoirs have become the main areas of development in the petroleum industry. There are a large number of nano-scale pores in unconventional oil and gas reservoirs, and the existing macro-statistical methods of Darcy and non-Darcy percolation cannot reveal the nonlinear flow mechanism and effective production mechanism of fluid in mesopores. Thus, it is urgent to carry out theoretical research on meso-flow in porous media to provide a theoretical basis for unconventional oil and gas development. This paper summarizes the research results in this area, including those of the authors. The current research status of fine and meso flow in porous media is summarized from three aspects: (1) theoretical analysis, (2) experimental research, and (3) numerical model, focusing on key issues such as the relationship and characterization of meso-scale fluid flow interface and micro-mechanical properties, meso–macro network simulation, meso-scale fluid (oil/water, gas/water) flow, meso-dynamic mechanism, and mathematical models. On this basis, the importance of the research on the interface effect and meso-mechanical characteristics of fine and micro-scale fluid flow, the nonlinear flow mechanism of the fine and meso-scale fluids, the construction of a mathematical model reflecting the meso-scale flow under the action of micro-forces, and the formation of a network simulation method are introduced. The study provides certain guiding significance for unconventional oil and gas development processes, revealing the meso-causes affecting flow, clarifying the production mechanism under different conditions, and promoting further development of the discipline of seepage mechanics.

     

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