POLYMER FLOODING METHOD IN A WEAKLY CEMENTED MANIFOLD Russian patent published in 2019 - IPC E21B43/20 C09K8/58 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, specifically to development of deposits with weakly cemented header. In the method of polymer flooding in a weakly cemented header, which involves injection of polymer solution of specified concentration into injection wells, 1.5–2 times more dense grid of wells is used than with water pumping, before injection, injection wells are drilled for at least 3 months, after which pumping of aqueous polymer solution is started at initial polymer concentration of not more than 30 % of specified value, gradually increasing polymer concentration to preset one, while providing required injectivity level of injection wells within maximum permissible bottomhole pressure, and for preparation of aqueous polymer solution high-molecular synthetic polymers having pseudoplastic properties are used. Invention is developed in subclaims.

EFFECT: increasing the volume of additional oil production in the shortest possible time, while maintaining the pore space structure of the weakly cemented collector.

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