HYDROMECHANICAL STRIKER Russian patent published in 2021 - IPC E21B37/00 

FIELD: mining.

SUBSTANCE: invention relates to the mining industry, particularly to an apparatus for cleaning mechanical impurities from the wellbore in the sub-packer zone. The hydromechanical striker is comprised of a detachable body, a seat with longitudinal slots, a spring-loaded support pusher, a hollow rod with an end valve spring-pressed to the seat and a crown at the lower end. The support pusher is equipped with a valve located in the inner bore of the seat configured to contact internally with the body of the end valve on the hollow rod. A bore is made at the lower end of the hollow rod wherein a plate is placed with a rod passed through the central hole of the crown and equipped with a nut screw. The support pusher is equipped with a through channel with a ball valve and a perforated divider. The bore in the body of the hollow rod is connected with the borehole cavity by passages in the body of the crown. A ring with lobes forming a centralizer is installed at the connection point of the detachable body.

EFFECT: provided are possibility of destructing dense sand-clay plugs in the sub-packer zone given small diametrical dimensions of the axial channel of the packer bore, possibility of centering the apparatus in the axial channel of the wellbore in the sub-packer zone, possibility of controlling the position of the apparatus at an optimal distance from the surface of the sand-clay plug, reduced hydraulic losses during the passage of the working fluid through the apparatus and possibility of filling the axial channel of the flexible pipe column with formation fluid during the run of the apparatus in the borehole.

1 cl, 2 dwg