OIL-FIELD BIOCIDE MADE FROM PERACETIC ACID AND METHOD FOR USE THEREOF Russian patent published in 2014 - IPC C09K8/88 E21B43/22 E21B43/267 A01N31/02 A01P15/00 

FIELD: chemistry.

SUBSTANCE: invention relates to biocide compositions for aqueous fluid agents used in oil- and gas-field operations. The biocidal composition of the aqueous fluid medium for treating wells contains a polymer or a copolymer for modifying viscosity of the fluid medium, a monocarboxylic peracid in an antimicrobial amount ranging from about 1 ppm to about 1000 ppm, and hydrogen peroxide in a concentration lower than that of the peracid in an aqueous medium. Said composition, containing a polymer or copolymer, reduces viscosity of the fluid medium, reduces friction or increases viscosity, and the acid is a precursor. The method of providing biocidal activity in the well treatment fluid medium involves adding to the well treatment fluid medium said composition which contains a polymer or copolymer to modify viscosity and feeding said medium into the underground medium. The invention is developed in subclaims.

EFFECT: providing high efficiency of eliminating microorganisms without deterioration of viscosity-modifying properties.

26 cl, 2 ex, 3 tbl