FIELD: oil and gas industry.
SUBSTANCE: invention relates to the oil industry, in particular to the increase in oil recovery of the heterogeneous permeability, flooded oil reservoirs by regulating of the injection wells injectability profile. Injection wells treatment method involves sequential injecting into the production formation of three portions of crosslinking polymer systems (CPS) based on hydrolyzed polyacrylamide (PAA) and chromium acetate (CA) as the cross-linker. Reagents concentration in the middle portion is above the critical gelling concentration by 10–15 %, and in the first and third portions the PAA concentration is 0.4–1.0 %. CA concentration is 0.04–0.1 %, the rest being water. Before processing the crosslinking polymer system gelling critical concentration is established in laboratory tests, under conditions close to the field conditions.
EFFECT: technical result is increase in the injection wells treatment method efficiency.
1 cl, 1 tbl, 4 dwg
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