GREAT WALL DRILLING TOOLS CO.,LTD
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, packers and similar tools must have a clean surface to grip, Foreign materials on casing walls will frequently cause these tools to become difficult to operation.The Casing Scraper is manufactured from a solid piece of heat treated steel. The scraper blades fit into machined recesses and are securely held by a dovetail keeper and spacer. The scraper blades feature left hand helical grooves and are hardfaced for maximum service. There are sufficient blades in the body to completely scrape the casing surface without routing the tool.Standard coimcciioni on (he Casing Scraper are API Reg., Box and Pin. Thn allows the scraper to be installed in the drilling string between the bit and the bit sub. The bit is run below the scraper to serve as a guide and prevent plugging the circulation hole through the scraper..
Technical specification and parameter
| Type | Max. O.D. of blade strech out (mm) | Min. O.D. of blade strech out (mm) | Connection | Casing Size (in) |
| GX114 | 106 | 95 | NC26 | 4 1/2 |
| GX127 | 118 | 105 | NC26 | 5 |
| GX140 | 130 | 117 | NC31 | 5 1/2 |
| GX168 | 158 | 141 | 3 1/2 REG | 6 5/8 |
| GX178 | 166 | 149 | 3 1/2 REG | 7 |
| GX245 | 230 | 212 | 4 1/2 REG | 9 5/8 |
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