METHOD FOR DEVELOPMENT OF OIL DEPOSIT IN HETEROGENEOUS RESERVOIR Russian patent published in 2025 - IPC E21B43/20 E21B43/30 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used in the development of an oil deposit in a heterogeneous layered reservoir. Disclosed is a method of developing an oil deposit in a heterogeneous stratified reservoir, drilling of vertical production and injection wells, pumping of a displacement agent and production of the product. During operation, oil and water production and injection of displacement agent are measured to clarify current development conditions and simulate the deposit development process. Geological structure of non-uniform stratified reservoir and its reservoir properties are specified by area and section. Obtained results are compared with the geological and hydrodynamic modelling data taking into account the current development conditions. Then, at least one horizontal well is drilled in the collector with length of at least 210 m between two vertical wells according to the approved design grid in a less permeable interlayer in parallel at distance of 1.5-2 m from the bottom in the purely oil zone of the deposit. Thereafter, deep perforation is made to a depth of at least 1 m along the entire shaft. Each perforation hole is spaced from the previous one by no more than 30 m and the azimuth of the direction is not less than 30° and sub-perpendicular to the main shaft.

EFFECT: increasing oil recovery of an oil deposit in a non-uniform stratified reservoir and increasing productivity of wells due to maximum drainage coverage of the deposit section.

1 cl, 2 dwg