FLUIDS FOR UNDERGROUND PROCESSING OF FORMATION, COPOLYMERS REDUCING FRICTION AND METHOD OF PROCESSING FORMATIONS Russian patent published in 2012 - IPC C09K8/68 E21B43/22 

FIELD: process engineering.

SUBSTANCE: invention relates to underground processing of formations. Proposed method comprises preparing fluid for processing formation containing water and copolymer reducing friction consisting of acrylamide in amount of 80 wt % to 90 wt % and acrylic acid in amount of 10 wt % to 20 wt %, and feeding it into underground formation. It comprises also preparing copolymer oil emulsion containing water, fluid non-miscible with water and aforesaid copolymer, combining emulsion with additional water for producing water fluid for formation processing, inverting emulsion so that said copolymer is released into water fluid to be forced into underground formation. proposed method comprises preparing copolymer oil emulsion containing water, fluid non-miscible with water containing mix of paraffin hydrocarbons and naphthenic hydrocarbons, emulsifier containing diethanolamide of fat acids of tall oil, monooleat of sorbite polyoxyethylene and sorbite monooleat, above specified copolymer and ammonium salt, 4-metoxyphenol and etoxylated alcohol C₁₂-C₁₆, combining said emulsion with additional water, inverting said emulsion so that copolymer reducing friction is forced into formation.

EFFECT: higher efficiency of reducing friction.

23 cl, 1 ex, 3 tbl