DEVICE FOR TREATMENT OF BOTTOMHOLE ZONE OF WELL Russian patent published in 2019 - IPC E21B28/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the petroleum industry and can be used for acidizing the bottomhole well zone. Device for treatment of bottomhole zone of well includes device for pulse pumping of liquid, destructible valve, packer and branch pipe with holes and with bushing fixed in this branch pipe with shear screw. Cylindrical boring is made from lower end of sleeve outer side wall. Height of this bore is selected more than thickness of rubber sheet of destructible valve. At the same time from the lower end of the hollow cylinder formed by the cylindrical bore there is a tapered wall tapering upwards, and a radial groove. Upper wall of radial groove adjoins boring end. Outer diameter of hollow cylinder is selected with possibility of cutting by lower end of rubber sheet of destructible valve. Distance between upper end of bushing and boring end is selected more than distance from upper part of wall of branch pipe hole to breakable valve.

EFFECT: higher operating efficiency.

1 cl, 2 dwg