Spring type Casing Scraper
This tool 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 down hole 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
Before run into downhole,the max. installation size of blade shall
be bigger the inside diameter,after run into downhole,the blade is
pressed to press the spring down,theradial force is given by
spring. When hard materials need to be scrapped,scrapping for
several times must be done before scrapped to casing inside
diameter. The scraper is connected on the low end of drill
string,the moving of drill string up and down make an axially
feeding in the scrapping operation.
It is showed in the structure that each spiral blade has two
internal and external curved scrapping edges. When the blade is
working for reciprocating scrapping,the internal edge and external
edge are working in turn,and there is a wider transverse edge band
between two scrapping edges stands a cutting and milling action to
the cut surface.
The strap blades are uniform distributed on the scraper so that the
returned mud can take the scraped substances away.
When ordering please specify:
● Casing Scraper Model;
● Connection, if nonstandard;
● Casing size and weight.
specifications - Casing Scraper
Max. O.D. of blade
Min. O.D. of blade
3 1/2 REG
3 1/2 REG
4 1/2 REG
More informations ,please kindly contact us immediately!
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