METHOD FOR REMOVING SILICON OXIDE AT EXTRACTION OF HEAVY OIL (VERSIONS) Russian patent published in 2013 - IPC E21B43/24 B01D1/28 

FIELD: oil and gas industry.

SUBSTANCE: method for removing oil from oil well involves the following: extraction of oil-water mixture from the well; separation of oil from oil-water mixture so that oil product and associated water containing the silicon oxide in it is obtained; transportation of associated water to evaporator and obtainment of steam and concentrated salt solution; addition of magnesium oxide or magnesium chloride to associated water or concentrated salt solution so that magnesium hydroxide is obtained; at that, magnesium oxide or magnesium chloride is added in doses so that weight ratio of magnesium to silicon oxide can be maintained equal approximately to 0.5:1 to approximately 3.0:1; combined deposition of magnesium hydroxide and magnesium oxide from associated water or concentrated salt solution; steam condensation so that distillate is obtained; transportation of distillate to steam generator and heating of distillate in the steam generator so that steam is generated; steam pumping to an injection well, which initiates the formation of oil-water mixture.

EFFECT: more cost-effective evaporation system intended for treatment of associated flow and for obtaining the flow of relatively pure feed water for a steam generator plant.

22 cl, 1 tbl, 5 dwg