Non-Rotating Wellbore Casing Scraper

A casing scraper, comprising:

• (a) a longitudinally extending one-piece tubular body, said tubular body having a longitudinally extending mandrel section;
• (b) a plurality of tubular blade carriers mounted in a longitudinal array along said mandrel section of said tubular body;
• said blade carriers mourned to rotate freely around said mandrel section of said tubular body, independent of rotation of tubular body;
• (c) a plurality of spring biased blades extending radially from each said blade carriers;
• (d) a plurality of centralizers mounted around said mandrel to rotate freely around said tubular body, independent of rotation of said tubular body and said blade carriers, said centralizer having radially extending tins;
• and
• (e) first and second threaded connection ends on said tubular body whereby said casing scraper may be included in a drillstring.

The method of scraping a wellbore casing comprising the steps of,

• (a) providing a rotatable drilling suing;
• (b) providing a casing scraper assembly, said casing scraper assembly comprising;
• (i) a longitudinally extending one-piece tubular body, said tubular body having a longitudinally extending mandrel section;
• (ii) a plurality of tubular blade carriers mourned m a longitudinal array along said mandrel section of said tubular body;
• said tubular blade carriers linked together longitudinally and mounted to rotate freely around said mandrel section of said tubular body, independent of rotation of tubular body;
• (iii) a plurality of spring biased blades extending radially from each said blade carriers;
• (iv) a plurality of centralizers mounted on said mandrel section to rotate freely around said mandrel section, independent of rotation of said tubular body and said blade carriers, said centralizer having radially extending fins;
• and
• (v) first and second threaded connection ends on said tubular body whereby said casing scraper may be attached to said drillstring;
• (c) attaching said casing scraper to a drillstring at said first and second threaded connection ends of said tubular body of said casing scraper;
• (d) running said drillstring with said attached casing scraping assembly into a wellbore lined with a wellbore casing:
• (e) rotating said drillstring:
• and
• (f) engaging said blades of said casing scraper assembly with said wellbore casing thereby scraping the interior wall of said casing with said blades independent of the rotation of said drillstring.