JUSTIFICATION METHOD OF INPUT PROFILE IN INJECTION WELL Russian patent published in 2017 - IPC E21B43/12 C09K8/508 E21B43/22 

FIELD: petroleum industry.

SUBSTANCE: justification method of an input profile in an injection well includes the pumping of a compound containing water suppression of polyacrylamide (PAA), cellulose ether, chromium acetate, and a filler into a shelf. Piolyanionic cellulose (PAC) or carboxymethyl cellulose (CMC) is used as a cellulose ether, the mass ratio of PAA and PAC or CMC is (1-4):1; solid microparticles of dolomitic powder or wood powder or zeolite-containing arterial with the concentration of 0.001-0.45 mass. % is used as a filler; after the pumping of the compound into a shelf, water solution fringe of a surface-active agent (SAA) and alkaline agent at the following mixture ratio, mass. %: SAA - 0.01-0.2, alkaline agent - 0.1-2.5, water - the rest, is additionally pumped; nonylphenol ethoxylate of complex SAA is used as SAA; sodium hydroxide or alkali salt is used as a alkaline agent, whereupon, the said compound and the fringe are pumped in a volumetric ratio of (2-5):1; the shelf is squeezed down by the pumped water in the volume of 10-20 m and the well is left for the process soak period of 4 days.

EFFECT: increasing of efficiency of the method by means of reduction of an induction period of gel formation, improvement of strength performance of obtained compounds leading to the increasing of oil recovery from non-uniform permeable shelves, as well as the expansion of process capabilities of the method.

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