DOWNHOLE DEVICE FOR IMPLEMENTATION OF HYDRAULIC FRACTURING OF ROCKS Russian patent published in 2020 - IPC E21B43/26 

FIELD: mining.

SUBSTANCE: present invention relates to a downhole device for performing hydraulic fracturing of rocks. Device consists of a housing made in the form of a cylinder with radial holes in the working fluid passage wall, two sealers with tips installed on both sides of the housing, a piston installed in the cylinder and equipped with a spring pressing it to the bottom, and connecting pipes. Cylinder is equipped with through cover, through central hole of which cylinder is inserted rod, piston is installed on rod, equipped with central through hole and collar from cylinder bottom side, piston is made in the form of a thick-wall cylindrical bushing, on the wall of which outside and inside there are annular grooves, on the working end of the piston there is an annular groove, collar of rod is inserted into annular groove of piston, and one of sealers is connected with rod.

EFFECT: improving reliability of the device and efficiency of hydraulic fracturing of rocks due to providing telescopic property of the device and involving tension forces on the side of sealers for subsequent actuation of the device.

1 cl, 3 dwg