FIELD: oil industry, particularly methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or slurry of minerals from wells.
SUBSTANCE: method involves injecting cross-linked polyacrylamide-based polymeric composition in well through injection and/or production well and producing oil through production wells. Polyacrylamide having molecular weight of 5-15 millions and 5-30% degree of hydrolysis is used. Acid and surfactant mixture plugs are injected in well before and after polymeric composition injection. Acid and surfactant are taken in ratio of 45:10. Acid and surfactant mixture plug and above polymeric composition are injected at minimal injection rate. After that the well operation is stopped for chemical reaction performing and then acid and surfactant mixture plugs are injected at maximal rate and the well is stopped for chemical reaction performing.
EFFECT: increased efficiency due to improved cohesion between rock and polymeric material and, as a result, increased residual resistance factor.
3 ex, 1 tbl, 2 dwg
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