SYSTEM OF DOWNHOLE EQUIPMENT FOR HYDRAULIC FRACTURING AND METHOD OF CONDUCTING HYDRAULIC FRACTURING (VERSIONS) Russian patent published in 2019 - IPC E21B43/26 

FIELD: mining.

SUBSTANCE: group of inventions relates to downhole equipment for hydraulic fracturing (HF). Downhole equipment system comprises a lower packer, a flushing port above the lower packer, a hydraulic fracturing port above the flushing port, an upper packer above the hydraulic fracturing port, a valve coupling above the upper packer and a jet pump above the valve coupling. To implement the method of hydraulic fracturing, a longitudinal arrangement is made for the hydraulic fracturing on a tubing string in a well. Top and bottom packer are activated to seal well section between packers. Flushing port is opened. Hydraulic fracturing port is opened and hydraulic fracturing fluid is supplied with proppant under pressure as per arrangement via hydraulic fracturing port, breaking the rocks surrounding the well. Top packer is depressurized. Pressure is created in the well and cleaning fluid is forced outside the upper packer. Remaining hydraulic fracturing fluid is removed from proppant from area located between packers. Jet pump is used for more intensive cleaning of area located between packers, from residual fluid of hydraulic fracturing and proppant.

EFFECT: simplification of extraction of hydraulic fracturing layout from well after hydraulic fracturing and acceleration of process of well cleaning from unhardened proppant.

15 cl, 19 dwg