Pressure Attenuation Law of Low-Frequency Pulse Pressure Flooding and Its Influence on Oil Recovery.

Pulse water injection is widely used in tertiary oil recovery. This study aims to reduce the pulse frequency, control the pulse frequency at 0.033∼0.1 Hz, simulate the pressure change in the formation at 0.1 Hz and 100 mD through COMSOL, and combine the core displacement experiment to determine the frequency. The effect of permeability change on the recovery factor of the water cut agent is summarized as follows: when the pulse frequency is 0.033∼0.066 Hz, the recovery factor of 100, 300, and 500 mD increases by 0.25, 0.34, and 0.39 percentage points, respectively, and these data can be of low frequency. The method proposed in this paper can provide certain theoretical basis and basic experimental data for tertiary oil recovery.