FIELD: oil and gas industry.
SUBSTANCE: invention is related to the methods eliminating biological contamination of fluids used for treatment of subsurface wells, and may be used in oil and gas industry. The countermeasure to biological contamination of fluids used for treatment of subsurface wells includes the following operations: receipt of the fluid for treatment with the first microbial count within limits from about 103 up to 1030 bacteria/ml; addition of the organic compound for fluid treatment that reduces virulence of microorganisms up to about 5 wt % of the fluid for treatment; placement of the fluid for treatment to the system equipped with a source of ultraviolet light; provision of potential interaction of free radicals with microorganisms in the fluid to reduce the first microbial count and to ensure placement of the fluid in subsurface.
EFFECT: invention allows enhancing biocidal effect and removing recontamination.
11 cl, 1 dwg
