METHOD FOR ASSESSING EFFECT OF ACOUSTIC ACTION ON OIL DISPLACEMENT Russian patent published in 2024 - IPC E21B49/00 G01N15/08 G01N33/24 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used to determine the effect of acoustic action on terrigenous rocks. Disclosed is a method for determining the effect of acoustic action on displacement of oil, including sampling of rocks, cutting parallel to bedding of a cylindrical sample, extraction of sample with alcohol-benzene mixture, determination of its gas permeability and porosity, simulation of initial oil saturation by means of sample saturation with kerosene under vacuum, then the sample is installed in the core holder and the sample is resaturated with a model of formation oil, pumping it through the sample until its oil permeability stabilizes. Further, the model of oil is displaced by the model of water used during waterflooding at the rate of injection used when maintaining formation pressure until complete watering of the fluid leaving the sample. Volume of displaced oil is determined by volumetric method in measuring tank and oil displacement coefficient is calculated without acoustic effect. Then, displacing water is injected into the sample with residual oil at acoustic exposure by waves with non-harmonic oscillations and frequencies from 100 to 17,000 Hz, after which volume of additionally displaced oil is also determined by volumetric method in measuring tank and oil displacement coefficient is calculated at acoustic effect. Then the sample is removed from the core holder, the content of residual oil is determined using the extraction-distillation method and the oil displacement factor is calculated taking into account the residual oil saturation of the sample. Based on the results of calculating oil displacement coefficients at all stages of the experiment, when comparing their values, the effect of acoustic action on oil displacement is determined.

EFFECT: increasing extraction of additional amount of oil from core samples under action of acoustic waves of different frequency.

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