COMPLEX REAGENT FOR DISINFECTING WATER PUMPED INTO OIL-BEARING STRATA Russian patent published in 2020 - IPC C09K8/03 C02F1/50 

FIELD: chemistry.

SUBSTANCE: invention relates to reagents intended for disinfection, including sulphate-reducing bacteria, pumped into oil-bearing formations of surface water, and can be used in oil industry. Invention contains a complex reagent for disinfecting water pumped into oil-bearing strata. Complex reagent consists of a mixture of biocidal ingredients and an ingredient preventing the reagent hardening at low temperatures. Biocidal ingredients used are polyhexamethyleneguanidine hydrochloride (PHMG-HC) and alkyldimethylbenzylammonium chloride (ADBAC). As the anti-caking ingredient, polyethylene glycol (PEG) or methanol is used. Weight ratio of ingredients in reagent is, %: PHMG-HC - 5–20; ADBAC -5–20; PEG or methanol - 25–60; water - up to 100.

EFFECT: technical result is providing high selectivity of biocidal ingredients introduced into the reagent with respect to suppressing the growth and development of sulphate-reducing bacteria, good solubility of the reagent in water and weak in oil, nonhardening at low temperatures.

1 cl, 1 tbl