METHOD FOR DEVELOPING OIL-WATER ZONE OF OIL FIELD Russian patent published in 2023 - IPC E21B43/32 

FIELD: oil production industry.

SUBSTANCE: invention can be used to develop the water-oil zone of oil fields using production wells. A method for developing a water-oil zone of an oil field includes perforating a production well and extracting oil through the production well. Previously, at the stage of construction of a production well in the area of the oil-water zone of the oil deposit, geophysical studies of the reservoir of the development object are carried out, the level of oil-water contact, oil saturation coefficients K_osat and the thickness h_osat of oil-saturated layers of the reservoir to the boundaries of the oil-water contact are determined, deep oil samples are taken, gas saturation pressure Р_sat and formation pressure R_f is determined. Next, the total thickness of all oil-saturated layers H_osat is determined, then the weighted average coefficient of oil saturation of the reservoir up to the oil-water contact K_osat.w.av. is determined according to the formula K_osat.w.av. = ((h_osat1 * K_osat1) + (h_osat2 * K_osat2)+…+ (h_osatn * K_osatn))/N_osat, fractions of units, where h_osat1 is the thickness of the oil-saturated layer located at the roof of the reservoir, h_osatn – the thickness of the oil-saturated layer located at the oil-water contact, K_osat1...K_osatn is the oil saturation coefficient in this layer, H_osat is the summed power of all oil-saturated layers in the reservoir. Next, the depression coefficient K_depr is determined using the formula: K_depr = P_sat/P_f, fractions of units, where P_sat is the gas saturation pressure, P_sat is the formational pressure. Then the perforation coefficient K_perf is determined using the formula K_perf = K_osat.w.av. * K_depr, fractions of units. Next, determine the length of the perforation interval from the roof of the N_perf collector using the formula: N_perf = K_perf * H_osat, m. Then the production well is perforated taking into account the length of the perforation interval.

EFFECT: improved efficiency and reliability of the method for developing the oil-water zone of an oil field.

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