METHOD FOR DEVELOPMENT OF HIGH-VISCOSITY OIL OF THE BASHKIR FACILITY Russian patent published in 2023 - IPC E21B43/26 

FIELD: development of oil fields.

SUBSTANCE: invention relates to methods for the production of high-viscosity oil from flooded reservoirs, represented by Bashkir carbonate deposits of the Bashkir dome. According to the method the power, injectivity of the perforated formation, water cut of production wells, and kinematic viscosity of oil are found. A formation section is selected with a perforated formation thickness of at least 2 m and a kinematic viscosity of oil of 1500-2000 cSt, with an injection well and reacting production wells with a water cut of not more than 45%, while the number of reacting production wells is at least four with a distance between wells from 200 to 400 m. Propane is injected into alternating reacting production wells in the lower part of the perforated interval of the productive formation, in uniform flows, in a volume calculated based on the injectivity of the formation. At the same time, 30% of the length of the entire perforated interval of the productive formation is taken as the lower part of the perforated interval. Further, an acoustic vibrator is lowered into the reacting production wells, in which propane is not injected, the formation is subject to a pulse impact within 19-21 hours. Then the above operations are repeated, starting with propane injection, while changing the reacting production wells for propane injection and pulse-percussive action, then the injection well is put into operation.

EFFECT: increased efficiency of the method for developing high-viscosity oil of the Bashkir facility by increasing the reservoir coverage, uniformity of oil reserves recovery, increasing the oil displacement efficiency by providing combined reservoir stimulation, accelerated mixing of propane, the absence of insoluble sediments and/or gas hydrates, complete removal of propane from the productive formation.

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