DEVICE FOR TREATMENT OF BOTTOM-HOLE ZONE Russian patent published in 2018 - IPC E21B28/00 E21B43/20 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 treating the bottomhole zone includes a device for pulsed liquid injection, a broken valve with a rubber sheet, a packer and a branch pipe with holes and with a sleeve fixed in this branch pipe with a shear screw. To the lower part of the inner side wall of the bushing are welded the outer edges of cruciform plates having the shape of a rectangular trapezoid. Plates are connected to each other by long trapezoid bases, and the sloping edges of these plates are located at the bottom. Identical ledges are made from the outer side edges of the plates under the lower end of the bushing. Distance between the two opposing side walls of the ledges is chosen less than the diameter of the portion of the rubber sheet of the valve to be broken that is not attached to the branch pipe. Inclined edges of the plates are sharpened. Height of the shoulder is selected more than the thickness of the rubber sheet of the valve to be broken, and the height of the sleeve is selected more than the distance from the top of the wall of the nozzle opening to the valve to be broken.

EFFECT: higher efficiency of device operation is achieved.

1 cl, 3 dwg