METHOD OF HYDRAULIC FRACTURING OF UNDERGROUND FORMATION Russian patent published in 2017 - IPC E21B43/267 

FIELD: mining.

SUBSTANCE: invention relates to mining and can be used for hydraulic fracturing an underground formation. To create in wedged cracks stabilized channels of high conductivity into the wellbore, first, pumped is the first hydraulic fracturing liquid not containing proppant particles and then the second hydraulic fracturing liquid, which is a suspension of proppant particles. Second liquid has a yield strength and the ability of solidification, and the ratio of the first liquid viscosity to the second liquid viscosity is not less than 0.1. After that the third hydraulic fracturing liquid is pumped not containing proppant particles, wherein the ratio of the first liquid viscosity to the second liquid viscosity is not less than 0.1, and the ratio of densities of the first and the third liquids varies from 0.8 to 1.2. Performed is repeated pumping into the wellbore the second hydraulic fracturing liquid, after which repeated pumping the third hydraulic fracturing liquid is performed.

EFFECT: technical result is improvement of efficiency of an underground formation hydraulic fracturing.

8 cl, 4 dwg, 2 tbl