发明名称 |
Replaceable wear band for well drill pipe |
摘要 |
A wear band for a well drill pipe which is made up of a coil spring sized to fit at the joint of the well drill pipe or casing. The inner surface of the coil spring includes a textured coating such as a carbide. The outer surface includes a plurality of hydrodynamic dimples defined therein, and preferably both the outer surface and the inner surface are adapted to resist corrosion. The abrasive coating preferably consists essentially of 95% tungsten carbide and a binder of 5% cobalt and coats an amount of the inner surface in the range of 50% to 100%. The hydrodynamic dimples are generally tear drop in shape to act as miniature fluid pumps. As a result, the wear band can be mechanically attached to the drill pipe while eliminating the need for metallurgically-welded hardbands and therefore unaffecting the drill pipe properties and dimensions.
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申请公布号 |
US2013000990(A1) |
申请公布日期 |
2013.01.03 |
申请号 |
US201213363416 |
申请日期 |
2012.02.01 |
申请人 |
DOWNIE JOSEPH A.;WARNES BRUCE M. |
发明人 |
DOWNIE JOSEPH A.;WARNES BRUCE M. |
分类号 |
E21B17/10;B05D3/12;B05D5/00;B21F35/00;C23C4/12 |
主分类号 |
E21B17/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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