FIELD: chemistry.
SUBSTANCE: aqueous composition for well operation, meant for pumping into an operating well, contains: water, a polymer selected from a group consisting of galactomannan polymers, galactomannan polymer derivatives, starch, xanthane gum, hydroxy cellulose, hydroxyalkyl cellulose, polyvinyl alcohol polymers, vinyl alcohol and vinyl acetate copolymers, and polymers which are a product of polymerisation of one or more monomers selected from a group consisting of vinyl pyrrolidone, 2-acrylamide-2-methylpropane sulphonic acid, acrylic acid and acrylamide, a biocide consisting of 3,5-dimethyl-1,3,5-thiadiazine-2-thione in an amount which is effective to inhibit bacterial growth. The method of inhibiting bacterial contamination using the aqueous composition for operating wells, meant for pumping into an operating well, involves adding an amount of biocide, consisting of 3,5-dimethyl-1,3,5-thiadiazine-2-thione, which is effective to inhibit bacterial growth, into the aqueous composition for operating wells and pumping said aqueous composition into an operating well.
EFFECT: high efficiency of inhibiting bacterial growth.
22 cl, 6 ex, 9 tbl
