SCRAPER FOR CLEANING INTERNAL SURFACE OF PIPES Russian patent published in 2016 - IPC E21B37/02 

FIELD: mining.

SUBSTANCE: invention relates to drilling wells, in particular to devices for cleaning internal surface of tubes from sediments and clay cake. Device includes hollow housing with web in axial channel, in which perpendicular to axis of housing hydraulically connected by feed channel with axial channel of housing above web and discharge channel with hollow housing axial channel under it. On outer surface at its ends there are conical threads, under them on housing there are cylindrical threads and cylindrical grooves, on which there are lock nuts, limiting axial movement of scraper elements installed on cylindrical grooves with possibility of rotation. In cylindrical bore stepped piston with blind partition in middle part is installed, with separation of inner channel. Directed outward channel is made in form of transverse slot, in which there is roller with notches on rotation axis. Other part of channel, which faces to bottom of cylindrical bore of hollow housing is made in form of inner bore, in which there is filter in form of perforated washer, together with blind partition forming intermediate chamber hydraulically connected to annular chamber under stepped piston through drain holes in its body, and through slots in body of nut is with well cavity.

EFFECT: higher efficiency, possibility of regulating process and cleaning of working surfaces.

1 cl, 3 dwg