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铁磁流体作为一种新型功能材料,由于同时具备磁性及流体性质被广泛应用于各个技术领域.本文从数值模拟理论上研究了利用磁场控制的铁磁流体驱油问题:针对外磁场作用下的铁磁流体多孔介质流动物理过程,将磁力项引入铁磁流体相运动方程从而耦合磁场-渗流场给出其流动方程,并采用全隐式有限体积法形成相应数值离散格式;通过二维均质填砂平板流动实验验证了模型和算法的正确性,在此基础上,对比了平面及纵向非均质多孔介质中注水及注铁磁流体的驱油效果,计算结果表明通过控制铁磁流体的驱替路径可以提高驱替波及范围继而提高采收率,为提高原油采收率提供了新的思路和方法.
As a new type of functional material, ferrofluid has been widely used in various technical fields because of its magnetic and fluid properties. In this paper, the problem of flooding with ferrofluid controlled by magnetic field is studied theoretically in numerical simulation. The physical process of the flow of ferrofluids in porous media is introduced into the ferrofluid phase motion equation by magnetic force terms, and the flow equation is given by the coupled magnetic field - seepage flow field. The implicit finite volume method is used to form the corresponding numerical discrete format. The experiment results show that the model and the algorithm are correct. Based on the comparison, the displacement effect of water injection and ferrofluid injection in the planar and longitudinal heterogeneous porous media is compared. The calculation results show that by controlling the ferrofluid The displacement path can improve the range of flood displacement and then increase the oil recovery, which provides a new idea and method for improving oil recovery.