METHOD FOR DEVELOPMENT OF MULTILAYER OIL RESERVOIR Russian patent published in 2016 - IPC E21B43/20 E21B43/32 E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used in developing oil deposit wells with side horizontal shafts. Method is used to drill vertical production and injection wells. Working fluid is pumped into injection wells and product is extracted from production wells. After flooding of production wells, method comprises drilling from their main shafts side horizontal branches. Flooded interlayers are determined and affecting injection well, which is reason flooding. Side horizontal borehole in interlayer is arranged in opposite direction relative to injection well at an angle of not less than 120° in horizontal plane to conditional straight line drawn between production and injection wells, and in other layers - towards injection well at an angle of 20-80° to above conditional line. Each nozzle is fitted with not more than three packers. In watered interlayer first packer is placed, starting from "heel" of horizontal shaft, at distance of 50-300 m, and in other layers - at a distance 50-300 m, counting from "tip" of horizontal shaft. Second and third packers are placed in each bore at equal distance from each other. During movement of product displacement front to producing wells with pumping of working agent to injection well is successively switching off flooded sections of producers.

EFFECT: high uniformity of oil reserves, increasing sweep efficiency and oil recovery.

1 cl, 1 dwg, 1 ex