HYDRAULIC DEVICE FOR SELECTIVE PROCESSING Russian patent published in 2019 - IPC E21B34/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, in particular to downhole equipment, and can be used in oil production, flushing and development of wells, elimination of hydrate-paraffin formations. Device for selective hydraulic processing comprises cylindrical housing with outer diameter D=82 mm with external connection threads D=46 mm (for connection of process equipment) and D=72 mm (for connection of centraliser) with length of 375 mm. Housing comprises 6 radially arranged through holes with thread D=6 mm for installation of fixing pins, 8 radial through holes with diameter D=12 mm, located at distance of 118 mm from upper end of housing of device, 8 radially arranged through holes with diameter D=12 mm, located at distance of 136 mm from upper end of device housing, cylindrical hydraulic hollow plunger, installed inside the housing, with length of 142 mm and diameter D=50 mm with inner through cylindrical hole D=28 mm. From top end of plunger there is collar with diameter D=62 mm with slotted groove for pins for fixation. Centraliser is installed in upper part of housing by means of connecting thread D=72 mm (for connection with housing) and has from upper end connecting thread D=62 mm (for connection of process equipment). In the upper part of the centraliser there are two cuts for 74 mm for the installation works and a through cylindrical hole with diameter D=40 mm inside the centraliser to prevent movement of the steel ball in the radial direction (the hole is made 4 mm larger than the diameter of the steel ball). Pins with length of 12 mm and diameter D=6 mm with cut-off head with length of 4 mm and diameter D=4 mm are installed in radial holes with thread D=6 mm in valve housing and retain hydraulic hollow plunger.

EFFECT: possibility of selective treatment and separate testing of two formations during acid treatment, simplified manufacturing and maintenance of the device, increased reliability and accuracy of valve adjustment.

4 cl, 3 dwg