METHOD FOR DETERMINATION OF CURRENT OIL SATURATION OF DEVELOPED RESERVOIR IN WORKING INTERVALS OF WELL WITH SUBSEQUENT RECOVERY OF FIELD OF CURRENT OIL SATURATION Russian patent published in 2020 - IPC E21B47/00 G01N15/08 E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, namely to rapid assessment of current oil saturation field based on field data. Geophysical survey is carried out using well drilling method. Based on their results, formation reservoir properties are determined. From the wells core is taken, on which investigations are performed to determine residual oil and water saturation of the formation. Field-geophysical survey is conducted to determine the operating intervals of the well perforation. Dynamics of liquid flow rate and water cut is determined in all production wells. Parameter characterizing the well water flooding rate is determined, on the basis of which the flooding factor is determined at water breakthrough to production wells. Thereafter, value of current oil saturation is determined in operating intervals of well perforation taking into account accumulated fluid production, current share of oil in well product, including with distribution of current saturation with oil on interlayers in well based on permeability and thickness of interlayers. Field of current oil saturation is reconstructed by area of developed section by interpolation between pairs of adjacent wells: production, production, production, delivery, delivery and delivery wells, as well as between wells and oil content contour.

EFFECT: detection of zones of localization of residual oil reserves by recovery of current oil saturation field and determination of zones of its maximum values for effective additional extraction of residual oil reserves.

1 cl, 2 tbl, 5 dwg