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Product type:Oil Country Tubular Goods--Drilling String
 
Name:Casing scraper
Item:ydaer_1
Description:
1. Applications
Spring casing drag scraper is applied to clean out cement lumps, cement ring, hard wax, different kinds of saline crystallization and setting matter entrained on the casing wall, perforation spews and iron oxide produced casing corrosion.
In order to drop all kinds of down-hole equipments fluently, especially ,when annular space is smaller between down hole tools and casing inside wall, it should be scraped fully, it can be gone a step further to operate again.
2. Structure
Spring casing drag scraper mainly consists of the body, cutter board, fixed block, pressure pad, spring and screw and so on.
The outside diameter of scraper is larger than casing internal diameter of casing scraping, so adhesion objects on the internal diameter can be scraped. Inclusion 360º whole circle can be seen cutter board projection from platform. There is a little overlap on it. See structure schematic diagram.
3. Principle
Spring scraper working principle is as well as cylindrical reamer in machining operation. It is cut out cut materials and slick cut surfaces by sharpen blade. Because scraper is operated under the down hole several kilometers, working environment is a small space, so it has a special operating mode. up and down reciprocating scraping hard materials, it may not once fully scrape to the casing internal diameter dimension. It needs scrape many times. To be scraped once, casing internal diameter is to be expanded once.
Radial force is provided by spring compression. String up and down travelling process is an axial feed.
It can be seen cutter blade struction, each spirality cutter blade has two internal and external compass cutting edge. When up and down reciprocating scraping, internal and external cutting edges are working in rotation. There is a wider transverse edge band surface between internal and external edges. During up and down travelling process, it plays a role in grinding and cutting. Scraped impurities are taken away by upward mud.

4. Technical Specifications and Parameters Technical

Type
Body external
diameter
Max. external
diameter of
cutter blade
Min. external
diameter of
cutter blade
Joint thread
Water
hole
GX-T114
90
107
94
NC26
15
GX-T127
100
120
104
NC26
18
GX-T140
110
134
115
NC31
25
GX-T178
136
170
146
3 1/2REG
30
GX-T245
200
238
210
4 1/2REG
57
GX-T13-3/8
292
338
292
6 5/8REG
71

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