METHOD OF SLICKWATER FRACTURING Russian patent published in 2017 - IPC E21B43/26 E21B43/267 C09K8/80 C09K8/90 

FIELD: mining.

SUBSTANCE: present invention relates to a method of hydraulic fracturing a subterranean formation. Method for slickwater hydraulic fracturing, comprising introducing into a wellbore an aqueous fracturing fluid containing polyethylene oxide – PEO, as an agent for reducing friction and non-ionic polymer – NP, and reducing friction of aqueous fluid for hydraulic fracturing, when said fluid pumped into wellbore, where NP protects PEO from shear decomposition and where said fluid is introduced into wellbore at pressure sufficient to create or expand hydraulic fracturing in subterranean formation, and weight ratio of PEO and NP is 1:20 to 20:1, and prevention of shear decomposition PEO due to turbulent flow of said fluid. Method of reducing shear decomposition of PEO while introducing aqueous fluid containing PEO, into wellbore, involving introduction of said fluid additionally containing NP, and reducing friction of said fluid, where NP prevents shear decomposition, and PEO shear force, where NP protects PEO against decomposition, where weight ratio of PEO and NP in said fluid ranges from 20:1 to 1:20 and amount of PEO ranges from 20 ppm to 100 ppm. Method of hydraulic fracturing, including introduction into wellbore an aqueous fluid for hydraulic fracturing and reducing friction of said fluid, where said fluid consists of water, a mixture containing PEO and NP, proppant, an agent which prevents agent swelling, or both filler, and agent preventing swelling, where fluid is introduced at pressure sufficient to create or expand hydraulic fracturing in subterranean formation, and where weight ratio of PEO and NP ranges from approximately 1:5 to approximately 5:1, and prevention of shear decomposition of PEO using NP. Invention is developed in depending points of the formula.

EFFECT: higher efficiency of reducing friction.

21 cl, 3 dwg, 3 ex