FIELD: oil and gas industry.
SUBSTANCE: proposed composition for changing water permeability of an underground formation includes expandable polymer microparticles with an average diameter of nonincreased volume of 0.05 to 5000 mcm, which consist of structured polymers that include labile linking agents and are chosen of a group consisting of star-shaped polymers, dendrite polymers, with hyperbranched polymers, polymers with short-chain branching, polymer with long-chain branching and any of their combinations, as well as include soldium acrylamide and acrylamidomethyl-propane sulphonate. Besides, the proposed method of variation of water permeability of an underground formation involves pumping of the above composition to the underground formation.
EFFECT: proposed composition due to enlargement of volume of polymer microparticles allows effective variation of permeability of underground formations and improvement of mobility or production rate of hydrocarbon fluids present in formations.
16 cl, 4 dwg, 7 ex
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