MULTIFORMATION OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2013 - IPC E21B43/14 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, when multiformation oil deposit is being developed, oil is extracted through production wells from lower productive horizon, working fluid is pumped to lower productive horizon, oil is extracted through production wells from upper productive horizon and well pattern of upper horizon is packed. Oil extraction through production wells from upper productive horizon is performed till formation pressure is decreased by 10-40%; when well pattern is being packed on injection wells operating for lower horizon, perforation at the upper horizon interval is performed. Separate pumping of working fluid is performed simultaneously to lower and upper horizons. When pumping is being performed to upper horizon, the pumping volume is preset, which is equal to the required compensation volume in the section, and the influence is observed as per responding production wells. In case of the influence confirmed with the rise of current bottomhole pressure in production wells of not less than 10%, the flow rate pumping is restricted for the injection well by 20-80% of the initial one, and the extraction is intensified for the responding production wells.

EFFECT: improving oil recovery of the deposit.

1 ex