FIELD: cementing.
SUBSTANCE: group of inventions relates to cleaning of filling pipe string. Scraper comprises one or more scraper elements arranged around the mandrel. Each scraper element contains a scraper cup, which expands in radial direction outward and in reverse direction relative to mandrel, nose unit connected with mandrel, and a drive element located around the mandrel and comprising a shoe and a cup connected to the shoe. Cup expands in radial direction outward and in reverse direction from shoe and has maximum diameter smaller, than maximum diameter of one or more scraper elements, or is equal to it. Shoe provides at least one of axial or radial support for cup. Drive element is located between one or more scraper elements and nose assembly.
EFFECT: increased efficiency of pipes rubbing and sealing with various inner diameters, possibility of passage through restrictions with minimum passes, prevention of scraping.
14 cl, 4 dwg
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