DEVICE FOR REMOVING ASPHALT-RESIN DEPOSITIONS FROM INNER SURFACE OF PUMP-COMPRESSOR PIPES Russian patent published in 1998 - IPC

FIELD: oil production industry; devices for cleaning bore-holes. SUBSTANCE: device has roller for suspending it by wire, extending scraper and weight connected with it, which is made up of dismountable sections. Made in lower part of weight is cylindrical space. Installed in lower end part of space is mechanical motion pair of screw and nut with non-selfbraking multistart thread. Nut is rigidly secured in weight body, and screw is made for axial displacement. Installed in upper end part of screw is stop, and lower end part of screw is connected with crushing member which is made up of cylindrical body with cutting edges located on it. Diameter of crushing member over outer lines of cutting edges is larger than diameter of scraper in folded position and is less than diameter of scraper in working position. End parts of screw have grooves, connection of screw with crushing member is sectional. During lowering of device, crushing member receives advancing and rotational movement. At lifting of device, extending scraper comes into operation. Highly efficient performance in removing asphalt-resin depositions is achieved due to increased crushing capacity of weight. EFFECT: higher efficiency. 4 cl, 1 dwg