METHOD FOR DETERMINING OIL DISPLACEMENT COEFFICIENT Russian patent published in 2021 - IPC G01N23/83 

FIELD: oil industry.

SUBSTANCE: invention is aimed to determine the oil recovery coefficient in laboratory conditions based on data obtained during the analysis of core samples of the field using X-ray radiation. The essence of the invention consists in the following stages: saturation of the core model with oil containing a radiopaque substance and fixing the value of the initial oil saturation; X-ray scanning of the core model after oil saturation and fixing the intensity of X-ray absorption by the core model saturated with oil; displacement of oil from the core model during continuous injection of a displacing agent into the core model with simultaneous X-ray scanning and fixing the intensity of X-ray absorption by the core model during oil displacement; determination of the values of the oil displacement coefficient by the intensity of X-ray absorption by the core model recorded as a result of X-ray scanning of the core model after oil saturation and during oil displacement from the core model during continuous injection into the core model of the displacing agent.

EFFECT: increasing accuracy of determining the oil displacement coefficient (C_disp), as well as the dynamics of changes in the displacement coefficient from the volume of the injected displacement agent.

30 cl, 4 dwg