微纳米弹性微球深部调驱技术已成为我国注水开发油田中高含水期一种经济有效的提高原油采收率方法，具有广阔的应用和发展前景。但目前对这类典型固体颗粒的渗流机理，尤其是微观渗流机制的认识尚不明确。本项目拟在已有研究基础上，引入一种新的基于LBM-IBM-DEM（格子Boltzmann方法-浸入边界法-离散单元法）耦合的方法，进一步阐释微纳米弹性微球的微观渗流机制。通过微纳米弹性微球性能测试及微观渗流实验，为微观模拟提供基础参数和实验验证；建立基于LBM-IBM-DEM的微纳米弹性微球微观渗流耦合模型，对微纳米弹性微球在多孔介质中运移、沉积、释放、捕集、封堵与变形运移（重启动）过程开展数值模拟，建立微纳米弹性微球微尺度流动与孔喉特征、流体性质之间的关系，最终揭示多孔介质中微纳米弹性微球渗流的流固耦合本质，为微纳米弹性微球的工业化应用奠定理论基础，促进高分子微纳米材料在提高原油采收率中的应用基础研究。

In-depth profile control and oil displacement technology using micro/nano elastic microspheres has become a cost-effective enhanced oil recovery method with extensive prospects of application and development at the mid-high water-cut stage of the water flooding oilfields in our country. However, at present, the percolation mechanisms, especially the microscopic percolation mechanisms of this kind of typical solid particles in porous media are not well understood. In the current project, on the basis of the primary research, a new coupled method based on LBM-IBM-DEM (i.e., Lattice Boltzmann method-immersed boundary method-discrete element method) is introduced to further elucidate the microscopic percolation mechanisms of micro/nano elastic microspheres in porous media. First, the properties of micro/nano elastic microspheres will be test and the microscopic flow experiments will be performed, which will provide basic parameters and experiment validation for the microscopic simulation. Then a coupled model for the microscopic percolation of micro/nano elastic microspheres based on LBM-IBM-DEM will be established and used to simulate the transport, deposition, release, capture, plugging and deformation-migration (restart) processes of micro/nano elastic microspheres in porous media. The aim is to build the relationship between the micro-scale flow of micro/nano elastic microspheres and the characteristics of pore-throats and fluid, and finally reveal the fluid-solid coupling nature of micro/nano elastic microspheres percolation in porous media. The research results will lay a theoretical foundation for the industrial application of micro/nano elastic microspheres, and thus promote the basic research for the application of micro/nano polymer materials in enhancing oil recovery.