METHOD OF DEVELOPING OIL RESERVOIR WITH HETEROGENEOUS RESERVOIR Russian patent published in 2025 - IPC E21B43/20 

FIELD: mining.

SUBSTANCE: invention relates to the oil industry, to methods for development in a heterogeneous terrigenous reservoir. This method includes drilling of the section of the deposit, pumping of displacement agent, and production from production wells. When the production well is flooded to 98%, two side horizontal shafts are drilled with an opposite direction to each other with a length of at least 250 m in the horizontal part and a branch from the main vertical shaft of not less than 100 m and parallel to the non-reservoir propagation line, vertical production well and its offshoots are developed for injection, in zone of non-reservoir zones gap horizontal production well is drilled with length of horizontal part of not more than 150 m against injection well with side horizontal shafts in less permeable interlayer and not less than 1.5 m from deposit bottom. Displacement is performed by pumping of displacement agent through branched horizontal sidetrack in cyclic mode: during injection into the vertical shaft of the injection well for 3 days, the horizontal one – in downtime, then in case of injection into side horizontal shafts for 7 days, the vertical one – in downtime.

EFFECT: present method will allow to increase oil recovery of the deposit.

1 cl, 1 dwg, 1 ex