发明名称 |
junta de ferramenta, sistema, e, método para formar uma cinta dura em uma ferramenta de furo descendente |
摘要 |
A tool joint comprises a body having a central axis, a first end, and a second end opposite the first end, wherein the body is made of a first material having a first hardness. In addition, the tool joint comprises an annular hardband disposed about the body. The hardband is made of a second material. The second material comprises a base material and a plurality of discrete pellets dispersed throughout the base material. The base material has a second hardness and the pellets have a third hardness. The second hardness is substantially the same as the first hardness. The third hardness is greater than the second hardness and less than the hardness of tungsten carbide. |
申请公布号 |
BR112013006291(A2) |
申请公布日期 |
2016.06.07 |
申请号 |
BR20131106291 |
申请日期 |
2011.09.14 |
申请人 |
NATIONAL OILWELL VARCO, L.P. |
发明人 |
MICHAEL JOSEPH JELLISON |
分类号 |
E21B29/08;E21B33/06 |
主分类号 |
E21B29/08 |
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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