METHOD OF DEVELOPMENT OF OIL MULTILAYER DEPOSIT Russian patent published in 2020 - IPC E21B43/14 E21B43/16 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry and, in particular, to investigation and development of multi-layer deposits with pumping and extraction from several formations simultaneously and separately. Sections with two productive formations and/or interlayers in section are selected by means of the help. Deposit is drilled by vertical injection wells and production wells with formation of development elements and opening of these formations and/or interlayers. Separate injection of working reagent into each formation through injection wells and separate extraction of product of each formation and/or interlayer through production wells with measurements of oil, water and pumped liquid production. Hydrodynamic analysis is performed. Formation pressure is maintained in each formation and/or interlayer in sampling zone at the required level. Production wells are constructed vertically. In studies, gas saturation pressure in formation production is determined. Long pipe string with a packer, which is installed between the formations and a short pipe string, is lowered into each injection and production wells. It is lowered to the packer. Each pipe is equipped with pressure sensors at outlet - for injection wells, or at inlet - for production wells. Through the short and long columns of the injection wells, water is injected into the upper and lower formations until formation pressure in the nearby wells reaches at least 60 % higher than the saturation pressure. Through the short and long columns of production well pipes production is performed at pressure of not less than 30 % higher than saturation pressure. Formation pressure and sampling pressure are fixed by pressure sensors and maintained in the extraction zone at the required level.

EFFECT: technical result is higher efficiency of development due to exclusion of flow stall during extraction and support of flooding front of upper and lower formations at required level.

1 cl, 1 dwg