Before run into downhole, the max. installation size of blade shall be bigger the insidediameter,after run into downhole,the blade is pressed to press the spring down,theradial forceis given by spring. When hard materials need to be scrapped,scrapping for several times mustbe done before scrapped to casing inside diameter. The scraper is connected on the low endof drill string,the moving of drill string up and down make an axially feeding in the scrappingoperation.
It is showed in the structure that each spiral blade has two internal and external curved scrap-ping edges. When the blade is working for reciprocating scrapping,the internal edge andexternal edge are working in turn,and there is a wider transverse edge band between twoscrapping 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 thescraped substances away.
When ordering please specify:
Casing Scraper Model;
Connection, if nonstandard;
Casing size and weight.