油藏多孔介质内微流体混相传质机理及流动特性研究

Microfluidics technology has become one of research hotspots in oil production field, which has self-processing and controlling functions. The microeffects caused by oil displacement in microfluidics, such as miscible forming, displacement stability and pore structure heterogeneity, are the cutting-edge topics in petroleum engineering field. Based on the enhanced mass-transfer process in micro porous media, this project has combined the microscopic visualization experiments and numerical simulation together, and studies on miscible mass-transfer mechanism and flow characteristics in microfluidics in reservoir porous media. The microscopic visualization experiments for miscible displacement in oil reservoir are launched by optical microscopic imaging technique, where the measurement for dynamic parameters are realized in flow processes in microfluidics, and the miscible forming mechanism and evolution characteristics in microfluidics are illuminated. Also the effects of displacement unstability on miscible flows in microfluidics are explored. the stable mathematical models and theoretic criterion for miscible displacement in microfluidics is established. The quantified characterization of microstructure in reservoir porous media are set up. The effect mechanism of micro heterogeneity on miscible flows are analysed. The coupling relationship between reservoir heterogeneity and displacement unstability is discussed. The migration mechnism and evolution characteristics of miscible displacement in microfluidics in oil reservoir are revealed. This study can lay a theoretical foundation for developing the mechanisms of high-quality and high-efficiency of oil production and security evaluation.

具有自处理、控制功能的微流体技术已成为石油开采领域的研究热点之一，由此引发的混相形成、驱替稳定性和孔隙结构非均质性等微观驱油效应，乃是目前石油工程界普遍关注的前沿课题。本项目立足于微观多孔介质的强化传质过程，结合微观可视化实验与数值模拟方法，深入开展油藏多孔介质内微流体混相传质机理及流动特性研究，利用光学显微成像技术进行油藏混相驱替的微观可视化实验，实现微流体流动过程的动态参数测量，阐明微流体混相的形成机理及演化特性；探析驱替不稳定性对微流体混相流动的影响机制，建立微流体混相驱替的稳定性数学模型及理论判据；确立油藏多孔介质骨架微观结构的定量化表征方法，探明微观非均质性对混相流动的作用机制，解析混相过程中油藏非均质性和驱替不稳定性的耦合关系，揭示微流体在油藏混相驱替过程中的运移机理与演化特性，为发展石油开采的增产增效机理和安全评估机制奠定理论基础。

具有自处理、控制功能的微流体技术已成为石油开采领域的研究热点之一，由此引发的混相形成、驱替稳定性和孔隙结构非均质性等微观驱油效应，乃是目前石油工程界普遍关注的前沿课题。本项目立足于微观多孔介质的强化传质过程，结合微观可视化实验与数值模拟方法，深入开展油藏多孔介质内微流体混相传质机理及流动特性研究，利用光学显微成像技术进行油藏混相驱替的微观可视化实验，实现微流体流动过程的动态参数测量，阐明微流体混相的形成机理及演化特性；探析驱替不稳定性对微流体混相流动的影响机制，建立微流体混相驱替的稳定性数学模型及理论判据；探讨非均质性对混相流动的影响机制，解析混相过程中油藏非均质性和驱替不稳定性的耦合关系，揭示微流体在油藏混相驱替过程中的运移机理与演化特性，为发展石油开采的增产增效机理和安全评估机制奠定理论基础。