Casing Scraper is ideal for the removal of dirt which may be left over the inside walls of casing, such as solid cement, hard wax, various salt crystals or deposits, perforation burrs, iron oxide residues resulted from rusting, so as to make all downhole tools pass through unblocked. Especially when a small circular clearance is available between the down hole tools and casing inside diameter, the complete scrapping becomes more necessary before further working. At present in the large petroleum well scrapping in the internal wall of casing by use of casing scraper is a necessary step.

The overall three-helix and four-helix stabilizers are divided into bottom hole type and drill string type. The wear-resistant materials (ie centralizers) on the working surface include cemented carbide pillars on the surface, diamond composites on the surface, and hardfacing electrodes, Various forms such as low temperature brazing hard alloy.