The low-frequency pulse wave makes the velocity of the fluid in the reservoir fluctuate dramatically, which results in a remarkable inertia force. The Darcy’s law was inapplicable to the pulse flow with strong effect of inertial force. In this paper, the non-Darcy flow equation and the calculation method of capillary number of pressure pulse displacement are established. The pressure pulse experiments of single-phase and two- phase flow are carried out. The results show that the periodic change of velocity can decrease the seepage resistance and enhance apparent permeability by generating the inertial force. The higher the pulse frequency improves the apparent permeability by enhancing influence of inertial force. The increase of apparent permeability of high permeability core is larger than that of low permeability core, which indicates that inertial force is more prominent in high permeability reservoir. For the water-oil two-phase flow, inertia force makes the relative permeability curve move towards right, and the equal permeability point becomes higher. In other words, with the increase of capillary number, part of residual oil is activated, and the displacement efficiency is improved.

低频脉冲波使储层中的流体速度发生剧烈波动，从而产生显着的惯性力。达西定律不适用于具有惯性力作用的脉冲流。建立了非达西流动方程和压力脉冲位移毛细管数的计算方法。进行了单相和两相流的压力脉冲实验。结果表明，速度的周期性变化可以通过产生惯性力来减小渗流阻力并提高表观渗透率。脉冲频率越高，通过增强惯性力的影响来改善表观磁导率。高磁导率岩心的表观磁导率的增加大于低磁导率岩心的表观磁导率的增加，这表明在高渗透储层中惯性力更为突出。对于水油两相流，惯性力使相对渗透率曲线向右移动，等渗透点变高。换句话说，随着毛细管数的增加，一部分残余油被活化，并且驱替效率提高。