METHOD OF HYDRAULIC BREAKDOWN OF FORMATION Russian patent published in 2014 - IPC E21B43/267 C09K8/80 

FIELD: oil and gas industry.

SUBSTANCE: method suggests deviation of injected operating fluid containing a friction reducer during hydraulic fracturing process. Hydraulic fracturing of the underground formation includes injection of an intermediate liquid with viscosity less than approximately 50 mPa·s at shear rate of 100 s^-1 at external conditions. Then proppant suspension is injected with viscosity less than approximately 50 mPa·s at shear rate of 100 s^-1 at external conditions. Thickened liquid is injected with viscosity more than approximately 50 mPa·s at shear rate of 100 s^-1 at external conditions or thickened liquid with viscosity less than approximately 20 mPa·s upon which it becomes thickened.

EFFECT: improving the hydraulic fracturing efficiency.

3 ex, 3 dwg