OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2024 - IPC E21B43/16 E21B43/17 C09K8/58 

FIELD: mining.

SUBSTANCE: invention relates to a method of developing an oil deposit. Method includes drilling of productive formation of deposit with a grid of wells. It also includes pumping of displacement agent into injection wells. Method also involves extraction of products from production wells and injection of a water-insulating polymer composition into injection wells. As the deposit is depleted, at least one production well is identified with watering of the product at the profitability limit – 85–97%. Production wells and injection wells hydrodynamically connected to this well are determined by hydrodynamic investigations. After that, production wells located around the selected production well are disconnected from operation. Then, injection wells located around the selected production well are sequentially shut off. Also, extraction from the identified well is increased by 12–19% of the average daily extraction to the maximum reduction of the formation pressure, but not lower than the maximum allowable one, which leads to destruction of the formation structure. After that, water-insulating polymer composition is pumped into hydrodynamically connected to this well in proportion directly proportional to hydraulic connection with this production well, and total volume in 1.3–1.5 times greater than volume of fluid withdrawn after increasing from the identified production well, to increase of injection pressure from initial in 1.1–1.2 times. Then pumping of displacement agent into these injection wells is stopped. Product extraction from production wells after process exposure is continued.

EFFECT: increasing the efficiency of isolation of water-saturated highly permeable zones of the deposit.

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