The Casing Scraper is used to clean cement, mud, embedded bullets, rust, mill scale, paraffin, perforation burrs . The Casing Scraper is used to clean cement, mud, embedded bullets, rust, mill scale, paraffin, perforation burrs and other sub-stances from the inside walli of casing. Maintaining a dean casing I. D. u irnportant to the operation of all tooh used in drilling the well. likewke, ...