FIELD: oil and gas industry.
SUBSTANCE: method for a hydraulic fracture of an underground reservoir, and method for the reduction in friction-related losses in well-processing fluid are claimed. Methods can be used for different types of processing of underground reservoirs. The method for a hydraulic fracture of an underground reservoir includes a stage of pumping of aqueous fluid for a hydraulic fracture into at least part of the underground reservoir under pressure sufficient for a hydraulic fracture of the reservoir, where the specified fluid for a hydraulic fracture has pH from 6 to 11 and contains a cross-linking agent, at least one polysaccharide, and copolymer containing one or more monomers of vinyl phosphonic acid, in the form of a water-in-oil emulsion. Copolymer is contained in an aqueous phase of the water-in-oil emulsion, and an oil phase of the water-in-oil emulsion contains inert hydrophobic liquid. Copolymer additionally contains one or more acrylamide monomers and/or one or more acrylic acid monomers. The method for the reduction in friction-related losses in well-processing fluid includes a stage of introduction into well-processing fluid of the above-mentioned friction-reducing copolymer and cross-linking agent. At the same time, the method for the reduction in friction-related losses additionally includes a stage of introduction of one or more polysaccharides into well-processing fluid before, after or simultaneously with the introduction of friction-reducing polymer.
EFFECT: increase in the efficiency of fluids for processing in underground zones due to the reduction in friction losses, while reducing reservoir destruction.
12 cl, 11 tbl, 5 ex
