FIELD: drilling soil or rock.
SUBSTANCE: invention relates to methods and systems for treating formation water associated with the drilling, pumping and extraction of gas and oil, or other industrial aqueous fluids. Method for reducing or eliminating from an aqueous fluid a pollution selected from the group consisting of calcium, magnesium, sodium, iron, chloride, manganese, calcium chlorate, sulfate, barium, hydrocarbons, total dissolved solids, biological contamination and combinations thereof comprises: introducing into the aqueous fluid an oxidant selected from the group consisting of oxygen, air, oxygen-enriched air, and combinations thereof, the introduction into the fluid of the first chlorine oxide selected from the group consisting of chlorine dioxide, chlorite and combinations thereof, and introducing a second chlorine oxide into the aqueous fluid after the introduction of the oxidant and the first chlorine oxide, the second chlorine oxide containing chlorine dioxide, chlorite or a combination thereof.
EFFECT: invention provides improved treatment of formation water, reduction or elimination of contaminants contained therein, as well as the possibility of re-use of treated water, in particular re-use as fluid for hydraulic fracturing.
24 cl, 9 dwg, 7 ex, 6 tbl
