Patent ID: 7311141

Claim:
A casing scraper comprising: a mandrel; at least one blade module mounted on the mandrel for rotation relative to the mandrel so that, in use, the scraper can be operated with the mandrel rotating relative to the casing being scraped and the blade module non-rotating relative to the casing being scraped, the or each blade module comprising a tubular housing having a plurality of through windows formed therein; a respective scraper block mounted in each window, each scraper block having retaining projections extending beyond a periphery of the associated window, the retaining projections preventing the scraper block from moving completely outwardly through its associated window; spring means acting on the scraper blocks to bias them radially outwardly of the housing; and reaction members attached to an inner radial surface of the tubular housing so as to overlay the associated window, the reaction members engaging the spring means and the housing to react the spring force applied to the scraper blocks onto the housing in which the respective scraper block is mounted, the spring means engage between the reaction member and its associated scraper block.