By using the independently developed ultrasound generator, natural cores with different permeability are selected to carry out the indoor core displacement experiment under simulation of the temperature and pressure of the actual formation, and the effect of ultrasonic action on the removal of reservoir water sensitive damage has been evaluated during seepage. The results show that for removing reservoir water sensitivity, ultrasonic frequency has an optimal range, there is a certain compensation relationship between frequency and power, and there is a certain relationship between the optimal processing time of ultrasound and the physical properties of the reservoir. The relationship between permeability recovery rate and the physical properties of reservoirs presents a complex relationship. The results are helpful to understand the mechanism of ultrasonic water sensitive removal and provide theoretical guidance for the popularization of this technology in oil field.
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